@article{moritz_vepraskas_ricker_2023, title={A rapid approach for ecological assessments in Carolina Bay wetlands that were previously converted to agriculture}, volume={6}, ISSN={["2624-893X"]}, DOI={10.3389/ffgc.2023.1148935}, abstractNote={Restoring wetlands is expensive, and methods for evaluating restoration condition are needed. This study developed chronosequences for use in ecological assessments (EAs) of restoration projects for Carolina Bay wetlands (CBWs) in the Southeastern US that were previously used for agriculture. An empirical method was also developed to estimate saturation levels to be used with the chronosequences. Data were collected from nine restored CBWs whose restoration ages ranged from 0 to 23 years. Plots were sorted into four Hydrologic Groups: 0–13 (Group 1), 14–50 (Group 2), 51–100 (Group 3), and 101+ (Group 4) consecutive days of saturation within 30 cm of the soil surface during the growing season. Litter thickness, tree basal area, and potential tree height were measured within a variable radius plot using a 10-factor prism across all Hydrologic Groups. Litter thickness and tree height reached an equilibrium at 15 years since restoration once crown closure occurred at the sites. In Groups 1 and 2, tree basal area reached an equilibrium at 15 years, and in Groups 3 and 4 it increased linearly to 23 and 21 years. Regression equations were developed (R2 = 0.57–0.73) to estimate saturation duration based on hydrology indicators, litter thickness, potential tree height, and soil type. These results showed that chronosequences and saturation duration would be useful for proposing performance standards in restored CBWs at time periods ranging from 5 to 23 years.}, journal={FRONTIERS IN FORESTS AND GLOBAL CHANGE}, author={Moritz, Christopher M. and Vepraskas, Michael J. and Ricker, Matthew C.}, year={2023}, month={Jun} }
 @article{moritz_vepraskas_ricker_2023, title={Soil organic carbon changes in a Carolina Bay wetland 15 years after restoration}, volume={3}, ISSN={["1435-0661"]}, url={https://doi.org/10.1002/saj2.20521}, DOI={10.1002/saj2.20521}, abstractNote={Abstract Evaluating wetland restoration success is complicated. In this study, soil organic carbon (SOC) pools in a Carolina Bay wetland (CBW) were determined for pre‐ and post‐restoration periods and compared to values in reference wetlands to determine if SOC could be used to evaluate restoration success. The CBW was Juniper Bay in Robeson County, NC, USA, that had been restored for 15 years following its use for agriculture. Previously, we determined both pre‐restoration SOCs and post‐restoration hydrology. Saturation occurrence and anaerobic conditions (15 years following restoration) were confirmed with Indicator of Reduction in Soils (IRIS) tubes. Soil morphological features, litter thickness, and SOC to 75 cm were also determined. There were significant ( p < 0.05) differences in numbers of hydric soil field indicators in the organic soils and no differences in the mineral soils ( p > 0.10) between pre‐ and post‐restoration periods. Litter thickness post‐restoration increased linearly with saturation duration. SOC decreased following restoration by 49% in mineral soils and 24% in organic soils as compared to pre‐restoration values. SOC concentrations in the restored wetland were not significantly different than those in reference wetlands indicating that the Juniper Bay restoration was successfully sequestering C. Litter thickness may be a good indicator of restoration success. SOC levels may decrease compared to reference wetland values if pre‐restoration soils were in agriculture.}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Moritz, Christopher M. and Vepraskas, Michael J. and Ricker, Matthew C.}, year={2023}, month={Mar} }
 @article{solihat_son_williams_ricker_plante_kim_2022, title={Assessment of artificial neural network to identify compositional differences in ultrahigh-resolution mass spectra acquired from coal mine affected soils}, volume={248}, ISSN={["1873-3573"]}, url={https://doi.org/10.1016/j.talanta.2022.123623}, DOI={10.1016/j.talanta.2022.123623}, abstractNote={This study assessed the applicability of artificial neural networks (ANNs) as a tool to identify compounds contributing to compositional differences in coal-contaminated soils. An artificial neural network model was constructed from laser desorption ionization ultrahigh-resolution mass spectra obtained from coal contaminated soils. A good correlation (R2 = 1.00 for model and R2 = 0.99 for test) was observed between the measured and predicted values, thus validating the constructed model. To identify chemicals contributing to the coal contents of the soils, the weight values of the constructed model were evaluated. Condensed hydrocarbon and low oxygen containing compounds were found to have larger weight values and hence they were the main contributors to the coal contents of soils. In contrast, compounds identified as lignin did not contribute to the coal contents of soils. These findings were consistent with the conventional knowledge on coal and results from the conventional partial least square method. Therefore, we concluded that the weight interpretation following ANN analysis presented herein can be used to identify compounds that contribute to the compositional differences of natural organic matter (NOM) samples.}, journal={TALANTA}, publisher={Elsevier BV}, author={Solihat, Nissa Nurfajrin and Son, Seungwoo and Williams, Elizabeth K. and Ricker, Matthew C. and Plante, Alain F. and Kim, Sunghwan}, year={2022}, month={Oct} }
 @article{marken_ricker_austin_2022, title={Combining Survey, Soil Coring, and GIS Methods to Improve Reservoir Capacity Estimates in the Maya Lowlands}, volume={10}, ISSN={["2326-3768"]}, url={https://doi.org/10.1017/aap.2022.6}, DOI={10.1017/aap.2022.6}, abstractNote={ABSTRACT This study reports water capacity estimates for four reservoirs within the Classic Maya city of El Perú-Waka’, Guatemala. Combining field survey, soil analysis, and a variety of GIS interpolation methods, it illustrates ways to more fully quantify a challenging resource—water—and its availability using an interdisciplinary approach. This is accomplished by comparing surface interpolation methods for estimating reservoir capacities to demonstrate that most provide reliable estimates. Reported estimates are further enhanced by analyzing internal reservoir soil morphology to better understand and quantify formation processes and refine estimates from field survey. These analyses document a multiscalar organization to water management within the Waka’ urban core that likely ran the gamut from individuals up to civic and state institutions. Although intricacies remain to be fully elucidated, this example offers an alternate path to theorizing about water management practices from traditional binary approaches.}, number={2}, journal={ADVANCES IN ARCHAEOLOGICAL PRACTICE}, publisher={Cambridge University Press (CUP)}, author={Marken, Damien B. and Ricker, Matthew C. and Austin, Robert}, year={2022}, month={May} }
 @article{moritz_vepraskas_ricker_2022, title={Hydrology and Vegetation Relationships in a Carolina Bay Wetland 15 Years after Restoration}, volume={42}, ISSN={["1943-6246"]}, url={https://doi.org/10.1007/s13157-022-01530-0}, DOI={10.1007/s13157-022-01530-0}, number={1}, journal={WETLANDS}, publisher={Springer Science and Business Media LLC}, author={Moritz, Christopher M. and Vepraskas, Michael J. and Ricker, Matthew C.}, year={2022}, month={Jan} }
 @article{williams_ricker_plante_2022, title={Quantification of geogenic carbon in anthropogenic alluvial coal soils of the Susquehanna River}, volume={8}, ISSN={["1537-2537"]}, url={https://doi.org/10.1002/jeq2.20391}, DOI={10.1002/jeq2.20391}, abstractNote={Alluvial riparian soils act as a filtration system, improving the environmental quality of downstream soils and waters. In areas affected by coal mining, alluvial soils also serve as a modern "sink" of fossil carbon (C). To date, little research has been done on ecosystem services provided by alluvial landscapes (i.e., river islands and tributary deltas) in the retention of coal in coal-mining regions. The objective of this study was to distinguish between and quantify geogenic and neogenetic C in alluvial soils of the North Branch of the Susquehanna River (NBSR). To investigate this, we compared five thermal analysis methods to quantify geogenic (coal) C in soils. Our results indicate that multivariate curve resolution of ramped thermal combustion data provided the most accurate estimate of coal content in soils. Our analysis found that NBSR alluvial soils have accumulated ∼375 Gg of anthropogenic, geogenic C (upper 1 m). In these soils, an average of ∼11%, of soil mass is attributable to coal, yet ∼ 73% of the total soil C is attributable to geogenic C. These SOC stocks are substantially greater than locally mapped riparian soils unaffected by coal mining, as well as greater than regional organic soils (Histosols). Quantification of microbial decomposition of coal in alluvial soils as well as vulnerability to extreme flood events (potential remobilization) requires further investigation and will be important in determining the fate of this C sink. This article is protected by copyright. All rights reserved.}, journal={JOURNAL OF ENVIRONMENTAL QUALITY}, author={Williams, Elizabeth K. and Ricker, Matthew C. and Plante, Alain F.}, year={2022}, month={Aug} }
 @article{caudle_osmond_heitman_ricker_miller_wills_2020, title={Comparison of soil health metrics for a Cecil soil in the North Carolina Piedmont}, url={https://doi.org/10.1002/saj2.20075}, DOI={10.1002/saj2.20075}, abstractNote={Abstract Soil health metric values may vary across soil types and even within the same soil series under different management systems. The goal of this study was to determine the amount of variation present in Cecil sandy loam soils (fine, kaolinitic, thermic Typic Kanhapludults) under row crop and hay management systems via field (single‐ring infiltration, Cornell Sprinkle Infiltrometer, and a farmer score card) and laboratory soil health metrics [soil respiration, phospholipid fatty acid (PLFA) analysis, permanganate‐oxidizable C (POXC), β‐glucosidase, β‐glucosaminidase, alkaline and acid phosphatase, arylsulfatase, phosphodiesterase, soil organic C (SOC), total N (TN), autoclave citrate‐extractable (ACE) protein content, aggregate stability, mean weight diameter, and bulk density]. Soil samples were collected in three hay and three crop fields. ANOVA indicated significant variations between systems, with depth and interactions among system, field, and/or slope position, depending on the metric ( p < 0.05). Infiltration measurements were highly variable and the measurement methods produced inconsistent values. The majority of laboratory metrics significantly decreased with depth. Soil respiration was significantly different between systems (crop > hay), whereas arylsulfatase, acid phosphatase, β‐glucosidase, β‐glucosaminidase, ACE, POXC, and aggregate stability had significant system × depth interactions (0–5 cm hay > crop) and POXC had a significant system × pedon interaction. Enzyme assays, PLFA measurements, POXC, TN, SOC, and ACE protein content were also significantly correlated with each other. Unexpected trends and variable results suggest that more data should be collected before effective soil health metrics and baseline values can be established.}, journal={Soil Science Society of America Journal}, author={Caudle, Caitlin and Osmond, Deanna and Heitman, Joshua and Ricker, Matthew and Miller, Grady and Wills, Skye}, year={2020}, month={May} }
 @article{el urbanismo de baja densidad en las tierras bajas mayas: el caso de el perú-waka’, petén, guatemala_2019, url={http://dx.doi.org/10.19130/iifl.ecm.2019.54.970}, DOI={10.19130/iifl.ecm.2019.54.970}, abstractNote={Como ejemplos clave del urbanismo en el Nuevo Mundo indígena, las ciudades mayas son temas de gran trascendencia antropológica. A pesar de su importancia comparativa, durante gran parte del siglo veinte los centros mayas del Clásico (ca. 250-950 d.C.) han sido vistos como “no-ciudades”, capitales de entidades complejas, pero marcadas por la ausencia de una densidad característica de lugares puramente urbanos. Fletcher propuso que el urbanismo maya corresponde a un tipo urbano que denomina “urbanismo agrario de baja-densidad”; aunque, como todas las categorías tipológicas, también tiene debilidades. Este artículo presenta los resultados de más de diez años de investigación de la ciudad maya clásica de El Perú-Waka’, en Guatemala, con el fin de evaluar el modelo de Fletcher en el área maya. Los datos procedentes de Waka’ sugieren que, a pesar de que en general el modelo de Fletcher es ampliamente aplicable a las Tierras Bajas, es necesario volver a examinar diversos supuestos sobre las ciudades mayas.}, journal={Estudios de Cultura Maya}, year={2019}, month={Jul} }
 @article{ricker_stolt_zavad_2019, title={Pollen Preservation in Alluvial Soils: Implications for Paleoecology and Land Use Studies}, volume={83}, ISSN={["1435-0661"]}, DOI={10.2136/sssaj2019.01.0025}, abstractNote={Floodplain landscapes with fluctuating water tables are nontraditional sites for palynology studies, and therefore intrinsic alluvial soil properties and their relationship to pollen preservation are poorly understood. The primary objective of this study was to identify soil properties that are most related to pollen preservation in floodplains to aid in predicting soil pollen presence and abundance. Our results indicate that all organic soil horizons had preserved pollen, whereas mineral horizons had variable pollen concentrations (range, 0–59,000 grains g⁻¹ soil). Mineral samples with preserved pollen (>0 grains g⁻¹ soil) had significantly greater (p < 0.001) soil organic matter (SOM) and silt + clay, and were located closer to the modern soil surface. Regression analyses indicated that only SOM and C/N ratios were significant predictors of pollen abundance. The guidelines developed in this study can be used to identify samples that likely contain enough pollen for palynological analysis and save future researchers considerable laboratory time, effort, and cost.}, number={5}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={Ricker, Matthew C. and Stolt, Mark H. and Zavad, Michael S.}, year={2019}, pages={1595–1600} }
 @book{ricker_marken_cooper_2019, place={Guatemala City, Guatemala}, series={Proyecto Arqueológico El Perú-Waka’}, title={Water Management within the Connected Xucub Reservoir and Northeast Tank Hydrologic Systems}, number={Informe No. 16, Temporada 2018}, institution={Fundación de Investigación Arqueológica Waka’}, author={Ricker, M.C. and Marken, D.B. and Cooper, Z.}, year={2019}, collection={Proyecto Arqueológico El Perú-Waka’} }
 @article{ricker_blosser_conner_lockaby_2019, title={Wood Biomass and Carbon Pools within a Floodplain Forest of the Congaree River, South Carolina, USA}, volume={39}, url={https://doi.org/10.1007/s13157-019-01150-1}, DOI={10.1007/s13157-019-01150-1}, number={5}, journal={Wetlands}, publisher={Springer Science and Business Media LLC}, author={Ricker, Matthew C. and Blosser, Gavin D. and Conner, William H. and Lockaby, B. Graeme}, year={2019}, month={Oct}, pages={1003–1013} }
 @inbook{ricker_marken_cooper_2018, place={Guatemala City, Guatemala}, title={Using soil descriptions to evaluate surface water management in the Ical Group}, number={15}, booktitle={Proyecto Arqueológico El Perú-Waka’}, publisher={Fundación de Investigación Arqueológica Waka’}, author={Ricker, M.C. and Marken, D.B. and Cooper, Z.}, year={2018}, pages={130–195} }
 @article{pierfelice_graeme lockaby_krauss_conner_noe_ricker_2017, title={Salinity Influences on Aboveground and Belowground Net Primary Productivity in Tidal Wetlands}, volume={22}, ISSN={1084-0699 1943-5584}, url={http://dx.doi.org/10.1061/(asce)he.1943-5584.0001223}, DOI={10.1061/(asce)he.1943-5584.0001223}, abstractNote={AbstractTidal freshwater wetlands are one of the most vulnerable ecosystems to climate change and rising sea levels. However salinification within these systems is poorly understood, therefore, productivity (litterfall, woody biomass, and fine roots) were investigated on three forested tidal wetlands [(1) freshwater, (2) moderately saline, and (3) heavily salt-impacted] and a marsh along the Waccamaw and Turkey Creek in South Carolina. Mean aboveground (litterfall and woody biomass) production on the freshwater, moderately saline, heavily salt-impacted, and marsh, respectively, was 1,061, 492, 79, and 0  g m−2 year−1 versus belowground (fine roots) 860, 490, 620, and 2,128  g m−2 year−1. Litterfall and woody biomass displayed an inverse relationship with salinity. Shifts in productivity across saline sites is of concern because sea level is predicted to continue rising. Results from the research reported in this paper provide baseline data upon which coupled hydrologic/wetland models can be created to qua...}, number={1}, journal={Journal of Hydrologic Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Pierfelice, Kathryn N. and Graeme Lockaby, B. and Krauss, Ken W. and Conner, William H. and Noe, Gregory B. and Ricker, Matthew C.}, year={2017}, month={Jan}, pages={D5015002} }
 @inbook{ricker_marken_rivas_2017, place={Guatemala City, Guatemala}, series={Proyecto Arqueológico El Perú-Waka’}, title={Soil coring transects in surface water features: Xucub, Northeast Tank, and Plaza 1 reservoirs}, number={14Informe No. 14, Temporada 2016}, booktitle={Proyecto Arqueológico El Perú-Waka’}, publisher={Fundación de Investigación Arqueológica Waka’}, author={Ricker, M.C. and Marken, D.B. and Rivas, A.}, year={2017}, pages={161–222}, collection={Proyecto Arqueológico El Perú-Waka’} }
 @inbook{ricker_steinhauser_prezkop_2017, title={The Gibraltar Soil Series: A Historical Record of Coal Mining in the Schuylkill River Basin}, booktitle={Northeast Regional Pedology Field Tour Guidebook (Pennsylvania Portion)}, author={Ricker, M.C. and Steinhauser, D.J. and Prezkop, J.T.}, editor={Valentine, J.A.Editor}, year={2017}, month={Jun} }
 @article{lockaby_noori_morse_zipperer_kalin_governo_sawant_ricker_2016, title={Climatic, ecological, and socioeconomic factors associated with West Nile virus incidence in Atlanta, Georgia, U.S.A.}, volume={41}, ISSN={1081-1710}, url={http://dx.doi.org/10.1111/jvec.12218}, DOI={10.1111/jvec.12218}, abstractNote={ABSTRACT: The integrated effects of the many risk factors associated with West Nile virus (WNV) incidence are complex and not well understood. We studied an array of risk factors in and around Atlanta, GA, that have been shown to be linked with WNV in other locations. This array was comprehensive and included climate and meteorological metrics, vegetation characteristics, land use / land cover analyses, and socioeconomic factors. Data on mosquito abundance and WNV mosquito infection rates were obtained for 58 sites and covered 2009–2011, a period following the combined storm water - sewer overflow remediation in that city. Risk factors were compared to mosquito abundance and the WNV vector index (VI) using regression analyses individually and in combination. Lagged climate variables, including soil moisture and temperature, were significantly correlated (positively) with vector index as were forest patch size and percent pine composition of patches (both negatively). Socioeconomic factors that were most highly correlated (positively) with the VI included the proportion of low income households and homes built before 1960 and housing density. The model selected through stepwise regression that related risk factors to the VI included (in the order of decreasing influence) proportion of houses built before 1960, percent of pine in patches, and proportion of low income households.}, number={2}, journal={Journal of Vector Ecology}, publisher={Wiley}, author={Lockaby, Graeme and Noori, Navideh and Morse, Wayde and Zipperer, Wayne and Kalin, Latif and Governo, Robin and Sawant, Rajesh and Ricker, Matthew}, year={2016}, month={Nov}, pages={232–243} }
 @article{odhiambo_ricker_le blanc_moxey_2016, title={Effects of forested floodplain soil properties on phosphorous concentrations in two Chesapeake Bay sub-watersheds, Virginia, USA}, volume={23}, ISSN={0944-1344 1614-7499}, url={http://dx.doi.org/10.1007/s11356-016-6668-3}, DOI={10.1007/s11356-016-6668-3}, abstractNote={Aquatic ecosystems are known to undergo fluctuations in nutrient levels as a result of both natural and anthropogenic processes. Changes in both extrinsic and intrinsic fluvial dynamics necessitate constant monitoring as anthropogenic alterations exert new pressures to previously stable river basins. In this study, we analyzed stream water and riparian zone soil phosphorous (P) dynamics in two third-order sub-watersheds of the lower Chesapeake Bay in Virginia, USA. The Ni River is predominantly forested (70 % forested), and Sugarland Run is a more human impacted (>45 % impervious surfaces) sub-watershed located in the suburbs of Washington D.C. Total stream P concentrations were measured during both high and low flows and Mehlich-3 methods were used to evaluate potential P fluxes in riparian soils. The results show total stream P concentrations in Sugarland Run ranged from 0.002 to 0.20 ppm, with an average of 0.054 ppm. In contrast, the forested Ni River had typical stream P concentrations <0.01 ppm. Total soil P was significantly higher in the more urbanized Sugarland Run basin (23.8 ± 2.1 ppm) compared to the Ni River basin (16 ± 3.7 ppm). Average stream bank erosion rates and corresponding cut-bank P flux rates were estimated to be 7.98 cm year(-1) and 361 kg P year(-1) for Ni River and 9.84 cm year(-1) and 11,600 kg P year(-1) for Sugarland Run, respectively. The significantly higher values of total P in the stream water and floodplain cut-banks of Sugarland Run suggests erosion and resuspension of previously deposited legacy sediments is an important processes in this human-impacted basin.}, number={16}, journal={Environmental Science and Pollution Research}, publisher={Springer Nature}, author={Odhiambo, B. K. and Ricker, M. C. and Le Blanc, L. M. and Moxey, K. A.}, year={2016}, month={May}, pages={16056–16066} }
 @article{ricker_lockaby_blosser_conner_2016, title={Rapid wood decay and nutrient mineralization in an old-growth bottomland hardwood forest}, volume={127}, ISSN={0168-2563 1573-515X}, url={http://dx.doi.org/10.1007/s10533-016-0183-y}, DOI={10.1007/s10533-016-0183-y}, number={2-3}, journal={Biogeochemistry}, publisher={Springer Nature}, author={Ricker, Matthew C. and Lockaby, B. Graeme and Blosser, Gavin D. and Conner, William H.}, year={2016}, month={Jan}, pages={323–338} }
 @article{brodbeck_lecompte_meder_ricker_wedge_schurman_anderson_2015, title={Evaluating a campus nitrogen budget for Auburn University, Alabama, USA}, volume={18}, ISSN={1083-8155 1573-1642}, url={http://dx.doi.org/10.1007/s11252-015-0458-4}, DOI={10.1007/s11252-015-0458-4}, number={4}, journal={Urban Ecosystems}, publisher={Springer Nature}, author={Brodbeck, A. Beau and LeCompte, Judson S. and Meder, Amanda L. and Ricker, Matthew C. and Wedge, Madeline and Schurman, Hanna and Anderson, Christopher J.}, year={2015}, month={Apr}, pages={1187–1211} }
 @article{ricker_lockaby_2015, title={Soil Organic Carbon Stocks in a Large Eutrophic Floodplain Forest of the Southeastern Atlantic Coastal Plain, USA}, volume={35}, ISSN={0277-5212 1943-6246}, url={http://dx.doi.org/10.1007/s13157-014-0618-y}, DOI={10.1007/s13157-014-0618-y}, number={2}, journal={Wetlands}, publisher={Springer Nature}, author={Ricker, Matthew C. and Lockaby, B. Graeme}, year={2015}, month={Jan}, pages={291–301} }
 @article{clark_odhiambo_ricker_2014, title={Comparative Analysis of Metal Concentrations and Sediment Accumulation Rates in Two Virginian Reservoirs, USA: Lakes Moomaw and Pelham}, volume={225}, ISSN={0049-6979 1573-2932}, url={http://dx.doi.org/10.1007/s11270-013-1860-2}, DOI={10.1007/s11270-013-1860-2}, number={2}, journal={Water, Air, & Soil Pollution}, publisher={Springer Nature}, author={Clark, Elyse V. and Odhiambo, Ben K. and Ricker, Matthew C.}, year={2014}, month={Feb} }
 @article{ricker_stolt_zavada_2014, title={Comparison of Soil Organic Carbon Dynamics in Forested Riparian Wetlands and Adjacent Uplands}, volume={78}, ISSN={0361-5995}, url={http://dx.doi.org/10.2136/sssaj2014.01.0036}, DOI={10.2136/sssaj2014.01.0036}, abstractNote={Wetland riparian soils typically have greater C pools than adjacent uplands, yet quantifying soil organic C (SOC) sequestration in riparian systems remains difficult. Quantification of major inputs and losses of autochthonous SOC through process-based measurements would allow for better comparisons between riparian and upland systems. In this study, we quantified major soil C fluxes within five paired headwater riparian and upland sites in Rhode Island. The difference between total C inputs and losses were used to construct net annual landscape-scale SOC sequestration rates. Annual SOC inputs were statistically similar between landscapes, with the exception of those from understory herbaceous vegetation, which were significantly greater (p < 0.001) in riparian zones than uplands. Mean annual C losses via soil respiration were also statistically similar between landscapes, but estimates of microbial respiration (actual loss of SOC) were significantly less (p < 0.01) in riparian ecosystems. Thus, riparian forests had greater net annual SOC sequestration (range 2.4–3.4 Mg C ha⁻¹ yr⁻¹) than paired upland sites (range 0.4–2.1 Mg C ha⁻¹ yr⁻¹). Our results suggest that process-based SOC sequestration measures can yield similar results to traditional methods, such as chronosequences, but our averaged estimates (2.0 Mg C ha⁻¹ yr⁻¹) were greater than those typically reported using alternate approaches.}, number={5}, journal={Soil Science Society of America Journal}, publisher={Soil Science Society of America}, author={Ricker, Matthew C. and Stolt, Mark H. and Zavada, Michael S.}, year={2014}, pages={1817} }
 @article{ricker_lockaby_2014, title={Soil Biogeochemical Processes across a Lateral Toposequence in an Old-Growth Floodplain Forest}, volume={78}, ISSN={0361-5995}, url={http://dx.doi.org/10.2136/sssaj2014.05.0205}, DOI={10.2136/sssaj2014.05.0205}, abstractNote={Floodplain forests are important landscapes that retain and transform nutrients derived from watershed sources. Although research has been conducted regarding biogeochemical processes in floodplains, few studies have been in old‐growth bottomland forests. Therefore, the goal of this study was to quantify how landscape variability and environmental factors influence floodplain biogeochemistry in old‐growth ecosystems of Congaree National Park (CONG), SC. During a 2‐yr period, we measured biogeochemical indices along an alluvial soil toposequence that included seasonal variation in microbial biomass and net N mineralization. Soil microbial biomass was relatively consistent throughout the study and displayed few relationships to environmental variables. Net N mineralization showed distinct seasonal variations ranging from 37 ± 9 to 412 ± 73 g N ha −1 d −1 during cool winter and warm summer months, respectively. Nitrate‐N was the major product of net N mineralization in all seasons, and only hydric soils in low‐lying topographic positions had appreciable net NH 4 –N production (>15% total N mineralized), which typically occurred after spring flooding. These results suggest that the intrinsic biogeochemical processes within the old‐growth bottomland forests of CONG differ from those of aggrading floodplain forests of the southeastern United States, especially with regard to production of excess NO 3 –N.}, number={6}, journal={Soil Science Society of America Journal}, publisher={Soil Science Society of America}, author={Ricker, Matthew C. and Lockaby, B. Graeme}, year={2014}, pages={2100} }
 @article{ricker_stolt_donohue_blazejewski_zavada_2013, title={Soil Organic Carbon Pools in Riparian Landscapes of Southern New England}, volume={77}, ISSN={0361-5995}, url={http://dx.doi.org/10.2136/sssaj2012.0297}, DOI={10.2136/sssaj2012.0297}, abstractNote={Riparian zones are important catchment‐scale depositional environments that receive episodic influx of sediment and C from watershed sources. The specific impacts of upland disturbances on riparian soil development and soil organic carbon (SOC) dynamics are still largely unknown. The goal of our study was to understand the role of riparian soils in retaining C at the landscape and catchment scales. We quantified SOC pools to a depth of 1 m at 29 headwater riparian sites in southern New England. Riparian SOC pools ranged from 117 to 495 Mg C ha −1 , with a mean pool of 246 Mg C ha −1 . On average, >50% of the total SOC was stored below 30 cm. Riparian SOC pools differed significantly between soils formed in relatively fast accreting environments (those that contain buried surface horizons; 277 Mg C ha −1 ) and those in slow accreting environments where buried horizons were absent (188 Mg C ha −1 ). Catchment‐scale analysis of SOC distribution indicated that riparian zones, on average, occupy 8% of the total watershed area yet store as much as 20% of the total catchment SOC. These results suggest that even though riparian zones occupy a small percentage of the overall watershed, these areas are an important component of the landscape for storage of SOC deposited as a result of catchment‐scale disturbances.}, number={3}, journal={Soil Science Society of America Journal}, publisher={Soil Science Society of America}, author={Ricker, Matthew C. and Stolt, Mark H. and Donohue, Sean W. and Blazejewski, Gary A. and Zavada, Michael S.}, year={2013}, pages={1070} }
 @article{ricker_donohue_stolt_zavada_2012, title={Development and application of multi-proxy indices of land use change for riparian soils in southern New England, USA}, volume={22}, ISSN={1051-0761}, url={http://dx.doi.org/10.1890/11-1640.1}, DOI={10.1890/11-1640.1}, abstractNote={Understanding the effects of land use on riparian systems is dependent upon the development of methodologies to recognize changes in sedimentation related to shifts in land use. Land use trends in southern New England consist of shifts from forested precolonial conditions, to colonial and agrarian land uses, and toward modern industrial-urban landscapes. The goals of this study were to develop a set of stratigraphic indices that reflect these land use periods and to illustrate their applications. Twenty-four riparian sites from first- and second-order watersheds were chosen for study. Soil morphological features, such as buried surface horizons (layers), were useful to identify periods of watershed instability. The presence of human artifacts and increases in heavy metal concentration above background levels, were also effective indicators of industrial-urban land use periods. Increases and peak abundance of non-arboreal weed pollen (Ambrosia) were identified as stratigraphic markers indicative of agricultural land uses. Twelve 14C dates from riparian soils indicated that the rise in non-arboreal pollen corresponds to the start of regional deforestation (AD 1749 +/- 56 cal yr; mean +/- 2 SD) and peak non-arboreal pollen concentration corresponds to maximum agricultural land use (AD 1820 +/- 51 cal yr). These indices were applied to elucidate the impact of land use on riparian sedimentation and soil carbon (C) dynamics. This analysis indicated that the majority of sediment and soil organic carbon (SOC) stored in regional riparian soils is of postcolonial origins. Mean net sedimentation rates increased -100-fold during postcolonial time periods, and net SOC sequestration rates showed an approximate 200-fold increase since precolonial times. These results suggest that headwater riparian zones have acted as an effective sink for alluvial sediment and SOC associated with postcolonial land use.}, number={2}, journal={Ecological Applications}, publisher={Wiley}, author={Ricker, M. C. and Donohue, S. W. and Stolt, M. H. and Zavada, M. S.}, year={2012}, month={Mar}, pages={487–501} }
 @article{odhiambo_ricker_2011, title={Spatial and isotopic analysis of watershed soil loss and reservoir sediment accumulation rates in Lake Anna, Virginia, USA}, volume={65}, ISSN={1866-6280 1866-6299}, url={http://dx.doi.org/10.1007/s12665-011-1098-5}, DOI={10.1007/s12665-011-1098-5}, number={1}, journal={Environmental Earth Sciences}, publisher={Springer Nature}, author={Odhiambo, Ben K. and Ricker, Matthew C.}, year={2011}, month={May}, pages={373–384} }
 @article{ricker_odhiambo_church_2008, title={Spatial Analysis of Soil Erosion and Sediment Fluxes: A Paired Watershed Study of Two Rappahannock River Tributaries, Stafford County, Virginia}, volume={41}, ISSN={0364-152X 1432-1009}, url={http://dx.doi.org/10.1007/s00267-008-9094-6}, DOI={10.1007/s00267-008-9094-6}, abstractNote={Soil erosion is a serious problem in areas with expanding construction, agricultural production, and improper storm water management. It is important to understand the major processes affecting sediment delivery to surficial water bodies in order to tailor effective mitigation and outreach activities. This study analyzes how naturally occurring and anthropogenic influences, such as urbanization and soil disturbance on steep slopes, are reflected in the amount of soil erosion and sediment delivery within sub-watershed-sized areas. In this study, two sub-watersheds of the Rappahannock River, Horsepen Run and Little Falls Run, were analyzed using the Revised Universal Soil Loss Equation (RUSLE) and a sediment delivery ratio (SDR) to estimate annual sediment flux rates. The RUSLE/SDR analyses for Horsepen Run and Little Falls Run predicted 298 Mg/y and 234 Mg/y, respectively, but nearly identical per-unit-area sediment flux rates of 0.15 Mg/ha/y and 0.18 Mg/ha/y. Suspended sediment sampling indicated greater amounts of sediment in Little Falls Run, which is most likely due to anthropogenic influences. Field analyses also suggest that all-terrain vehicle crossings represent the majority of sediment flux derived from forested areas of Horsepen Run. The combined RUSLE/SDR and field sampling data indicate that small-scale anthropogenic disturbances (ATV trails and construction sites) play a major role in overall sediment flux rates for both basins and that these sites must be properly accounted for when evaluating sediment flux rates at a sub-watershed scale.}, number={5}, journal={Environmental Management}, publisher={Springer Nature}, author={Ricker, Matthew C. and Odhiambo, Ben K. and Church, Joseph M.}, year={2008}, month={Mar}, pages={766–778} }
 @inbook{marken_ricker_rivas_maxson, title={Low Density Urbanism in the Maya Lowlands: The Case of El Perú-Waka ', Petén, Guatemala}, booktitle={Estudios de Cultura Maya.}, author={Marken, D.B. and Ricker, M.C. and Rivas, A. and Maxson, E.} }