@article{albaugh_albaugh_carter_cook_cohrs_rubilar_campoe_2021, title={Duration of response to nitrogen and phosphorus applications in mid-rotation Pinus taeda}, volume={498}, ISSN={["1872-7042"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85112486933&partnerID=MN8TOARS}, DOI={10.1016/j.foreco.2021.119578}, abstractNote={We quantified the response duration to one-time applications of 112, 224, and 336 kg ha−1 of elemental nitrogen (112 N, 224 N, and 336 N, respectively) combined with 28 or 56 kg ha−1 of elemental phosphorus in mid-rotation Pinus taeda L. stands. Post-application measurements continued for 10 years at 32 sites in the southeastern United States and one site in Argentina, and we fit a Ricker model to data from each treatment in the event that a zero growth response was not observed in our measured data. The response duration was eight (measured), 14 (modeled), and 16 (modeled) years after treatment for the respective 112 N, 224 N, and 336 N treatments. The corresponding growth response per unit of applied nitrogen estimated from fertilization to when the growth response was not different from zero (whether measured or modeled) was 0.20, 0.16, and 0.13 m3 kg−1 for the 112 N, 224 N, and 336 N treatments, respectively. We hypothesized that the mechanism controlling the response duration was related to the amount of fertilizer nitrogen remaining in the foliage over time after treatment; previous studies found that nitrogen application had large impacts on the foliage amount and foliar nitrogen content. Based on retranslocation rate estimates from the literature of 67% of fertilizer nitrogen per year, our results suggest that a good correlation exists between the growth response and the amount of fertilizer nitrogen remaining in the foliage.}, journal={FOREST ECOLOGY AND MANAGEMENT}, author={Albaugh, Timothy J. and Albaugh, Janine M. and Carter, David R. and Cook, Rachel L. and Cohrs, Chris W. and Rubilar, Rafael A. and Campoe, Otavio C.}, year={2021}, month={Oct} }
 @article{albaugh_albaugh_heiderman_leggett_stape_king_katherine p. o'neill_king_2014, title={Evaluating changes in switchgrass physiology, biomass, and light-use efficiency under artificial shade to estimate yields if intercropped with Pinus taeda L.}, volume={88}, ISSN={["1572-9680"]}, DOI={10.1007/s10457-014-9708-3}, number={3}, journal={AGROFORESTRY SYSTEMS}, author={Albaugh, Janine M. and Albaugh, Timothy J. and Heiderman, Ryan R. and Leggett, Zakiya and Stape, Jose L. and King, Kyle and Katherine P. O'Neill and King, John S.}, year={2014}, month={Jun}, pages={489–503} }
 @article{albaugh_domec_maier_sucre_leggett_king_2014, title={Gas exchange and stand-level estimates of water use and gross primary productivity in an experimental pine and switchgrass intercrop forestry system on the Lower Coastal Plain of North Carolina, USA}, volume={192}, ISSN={["1873-2240"]}, DOI={10.1016/j.agrformet.2014.02.013}, abstractNote={Despite growing interest in using switchgrass (Panicum virgatum L.) as a biofuel, there are limited data on the physiology of this species and its effect on stand water use and carbon (C) assimilation when grown as a forest intercrop for bioenergy. Therefore, we quantified gas exchange rates of switchgrass within intercropped plots and in pure switchgrass plots during its second growing season in an intensively managed loblolly pine (Pinus taeda L.) plantation in North Carolina. Switchgrass physiology was characterized over the growing season from June to October 2010 in terms of photosynthesis (μmol m−2 s−1), stomatal conductance (mmol m−2 s−1), and assimilation responses to photosynthetic photon flux density and intercellular carbon dioxide concentration (CO2). We then used a process-based model of the soil–plant–atmosphere continuum to scale leaf-level gas exchange data to provide estimates of pine and switchgrass stand-level water use (mm) and carbon exchange (g C m−2) over a three-year period. Peak switchgrass photosynthesis (32.7 ± 0.9 μmol m−2 s−1) and stomatal conductance (252 ± 12 mmol m−2 s−1) rates were measured in July, with minimum values (18.7 ± 1.4 μmol m−2 s−1 and 104 ± 6 mmol m−2 s−1, respectively) recorded at the end of the growing season (October). Switchgrass gas exchange and parameter estimates from the light- and CO2 response curves did not vary between treatments. However, gas exchange values differed significantly between measurement dates. Model predictions of stand-level transpiration ranged from 287 to 431 mm year−1 for pine and from 245 to 296 mm year−1 for switchgrass. Annual C exchange for loblolly pine ranged from 1165 to 1903 g m−2 compared to 1386 to 1594 g m−2 for switchgrass. At this stage of stand development, no effect of intercropping was evident and there was no effect of distance from the nearest pine row on any switchgrass gas exchange variable measured. However, we anticipate that as this intercropped system develops over time, competition for resources such as light, water or nitrogen may change, with the potential to impact switchgrass physiology and biomass production.}, journal={AGRICULTURAL AND FOREST METEOROLOGY}, author={Albaugh, Janine M. and Domec, Jean-Christophe and Maier, Chris A. and Sucre, Eric B. and Leggett, Zakiya H. and King, John S.}, year={2014}, month={Jul}, pages={27–40} }
 @article{king_ceulemans_albaugh_dillen_domec_fichot_fischer_leggett_sucre_trnka_et al._2013, title={The Challenge of Lignocellulosic Bioenergy in a Water-Limited World}, volume={63}, ISSN={["1525-3244"]}, DOI={10.1525/bio.2013.63.2.6}, abstractNote={It is hoped that lignocellulosic sources will provide energy security, offset carbon dioxide enrichment of the atmosphere, and stimulate the development of new economic sectors. However, little is known about the productivity and sustainability of plant cell-wall energy industries. In this study, we used 16 global circulation models to project the global distribution of relative water availability in the coming decades and summarized the available data on the water-use efficiency of tree- and grass-based bioenergy systems. The data on bioenergy water use were extremely limited. Productivity was strongly correlated with water-use efficiency, with C4 grasses having a distinct advantage in this regard. Our analysis of agro climatic drivers of bioenergy productivity suggests that relative water availability will be one of the most important climatic changes to consider in the design of bioenergy systems.}, number={2}, journal={BIOSCIENCE}, author={King, John S. and Ceulemans, Reinhart and Albaugh, Janine M. and Dillen, Sophie Y. and Domec, Jean-Christophe and Fichot, Regis and Fischer, Milan and Leggett, Zakiya and Sucre, Eric and Trnka, Mirek and et al.}, year={2013}, month={Feb}, pages={102–117} }
 @article{albaugh_sucre_leggett_domec_king_2012, title={Evaluation of intercropped switchgrass establishment under a range of experimental site preparation treatments in a forested setting on the Lower Coastal Plain of North Carolina, USA}, volume={46}, DOI={10.1016/j.biombioe.2012.06.029}, abstractNote={There is growing interest in using switchgrass (Panicum virgatum L.) as a biofuel crop and for its potential to sequester carbon. However, there are limited data on the establishment success of this species when grown as a forest intercrop in coastal plain settings of the U.S. Southeast. Therefore, we studied establishment success of switchgrass within experimental intercropped plots and in pure switchgrass plots in an intensively managed loblolly pine (Pinus taeda) plantation in eastern North Carolina. Pine trees were planted in the winter of 2008, and switchgrass was planted in the summer of 2009. Establishment success of switchgrass was measured over the growing season from May to October 2010, and quantified in terms of percent cover, height (cm), tiller density (number of tillers m−2), leaf area index and biomass (Mg ha−1). At the end of the growing season, pure switchgrass plots were taller than the intercropped treatments (114 ± 2 cm versus 98 ± 1 cm, respectively), but no significant treatment effects were evident in the other variables measured. Switchgrass biomass across all treatments increased from 2.65 ± 0.81 Mg ha−1 in 2009 to 4.14 ± 0.45 Mg ha−1 in 2010. There was no significant effect of distance from the pine row on any switchgrass growth parameters. However, we anticipate a shading effect over time that may limit switchgrass growth as the pines approach stand closure.}, journal={Biomass and Bioenergy}, author={Albaugh, J. M. and Sucre, E. B. and Leggett, Zakiya H and Domec, J. C. and King, J. S.}, year={2012}, pages={673–682} }
 @article{albaugh_blevins_allen_albaugh_fox_stape_rubilar_2010, title={Characterization of foliar macro- and micronutrient concentrations and ratios in loblolly pine plantations in the southeastern United States}, volume={34}, number={2}, journal={Southern Journal of Applied Forestry}, author={Albaugh, J. M. and Blevins, L. and Allen, H. L. and Albaugh, T. J. and Fox, T. R. and Stape, J. L. and Rubilar, R. A.}, year={2010}, pages={53–64} }