@article{xu_zhang_zhu_xiao_zhu_zhang_yu_li_zhu_tu_et al._2020, title={Large losses of ammonium-nitrogen from a rice ecosystem under elevated CO2}, volume={6}, ISSN={["2375-2548"]}, DOI={10.1126/sciadv.abb7433}, abstractNote={Carbon dioxide enrichment facilitates nitrogen loss through anaerobic oxidation of ammonium coupled to the reduction of iron.}, number={42}, journal={SCIENCE ADVANCES}, author={Xu, Chenchao and Zhang, Kaihang and Zhu, Wanying and Xiao, Jing and Zhu, Chen and Zhang, Naifang and Yu, Fangjian and Li, Shuyao and Zhu, Chunwu and Tu, Qichao and et al.}, year={2020}, month={Oct} }
 @article{cheng_booker_burkey_tu_shew_rufty_fiscus_deforest_hu_2014, title={SOIL MICROBIAL RESPONSES TO ELEVATED CO2 AND O-3 IN A NITROGEN-AGGRADING AGROECOSYSTEM}, volume={6}, ISBN={["978-1-77188-021-3"]}, DOI={10.1371/journal.pone.0021377}, abstractNote={Climate change factors such as elevated atmospheric carbon dioxide (CO2) and ozone (O3) can exert significant impacts on soil microbes and the ecosystem level processes they mediate. However, the underlying mechanisms by which soil microbes respond to these environmental changes remain poorly understood. The prevailing hypothesis, which states that CO2- or O3-induced changes in carbon (C) availability dominate microbial responses, is primarily based on results from nitrogen (N)-limiting forests and grasslands. It remains largely unexplored how soil microbes respond to elevated CO2 and O3 in N-rich or N-aggrading systems, which severely hinders our ability to predict the long-term soil C dynamics in agroecosystems. Using a long-term field study conducted in a no-till wheat-soybean rotation system with open-top chambers, we showed that elevated CO2 but not O3 had a potent influence on soil microbes. Elevated CO2 (1.5×ambient) significantly increased, while O3 (1.4×ambient) reduced, aboveground (and presumably belowground) plant residue C and N inputs to soil. However, only elevated CO2 significantly affected soil microbial biomass, activities (namely heterotrophic respiration) and community composition. The enhancement of microbial biomass and activities by elevated CO2 largely occurred in the third and fourth years of the experiment and coincided with increased soil N availability, likely due to CO2-stimulation of symbiotic N2 fixation in soybean. Fungal biomass and the fungi∶bacteria ratio decreased under both ambient and elevated CO2 by the third year and also coincided with increased soil N availability; but they were significantly higher under elevated than ambient CO2. These results suggest that more attention should be directed towards assessing the impact of N availability on microbial activities and decomposition in projections of soil organic C balance in N-rich systems under future CO2 scenarios.}, number={6}, journal={CARBON CAPTURE AND STORAGE: CO2 MANAGEMENT TECHNOLOGIES}, author={Cheng, Lei and Booker, Fitzgerald L. and Burkey, Kent O. and Tu, Cong and Shew, H. David and Rufty, Thomas W. and Fiscus, Edwin L. and Deforest, Jared L. and Hu, Shuijin}, year={2014}, pages={277–307} }
 @article{yi_wen-xia_tu_washburn_lei_hu_2014, title={Soil Carbon, Nitrogen and Microbial Dynamics of Pasturelands: Impacts of Grazing Intensity and Planting Systems}, volume={24}, ISSN={["2210-5107"]}, DOI={10.1016/s1002-0160(14)60027-8}, abstractNote={Management intensity critically influences the productivity and sustainability of pasture systems through modifying soil microbes, and soil carbon (C) and nutrient dynamics; however, such effects are not well understood yet in the southeastern USA. We examined the effects of grazing intensity and grass planting system on soil C and nitrogen (N) dynamics, and microbial biomass and respiration in a long-term field experiment in Goldsboro, North Carolina, USA. A split-plot experiment was initiated in 2003 on a highly sandy soil under treatments of two grass planting systems (ryegrass rotation with sorghum-sudangrass hybrid and ryegrass seeding into a perennial bermudagrass stand) at low and high grazing densities. After 4 years of continuous treatments, soil total C and N contents across the 0–30 cm soil profile were 24.7% and 17.5% higher at the high than at the low grazing intensity, likely through promoting plant productivity and C allocation belowground as well as fecal and urinary inputs. Grass planting system effects were significant only at the low grazing intensity, with soil C, N, and microbial biomass and respiration in the top 10 cm being higher under the ryegrass/bermudagrass than under the ryegrass/sorghum-sudangrass hybrid planting systems. These results suggest that effective management could mitigate potential adverse effects of high grazing intensities on soil properties and facilitate sustainability of pastureland.}, number={3}, journal={PEDOSPHERE}, author={Yi, Wang and Wen-Xia, Duan and Tu, C. and Washburn, S. and Lei, Cheng and Hu, S.}, year={2014}, month={Jun}, pages={408–416} }
 @article{cheng_booker_burkey_tu_shew_rufty_fiscus_deforest_hu_2014, title={Soil microbial responses to elevated CO2 and O-3 in a nitrogen-aggrading agroecosystem}, DOI={10.1201/b16845-14}, journal={Carbon Capture and Storage: CO2 Management Technologies}, author={Cheng, L. and Booker, F. L. and Burkey, K. O. and Tu, C. and Shew, H. D. and Rufty, T. W. and Fiscus, E. L. and Deforest, J. L. and Hu, Shuijin}, year={2014}, pages={277–307} }
 @article{cheng_booker_tu_burkey_zhou_shew_rufty_hu_2012, title={Arbuscular Mycorrhizal Fungi Increase Organic Carbon Decomposition Under Elevated CO2}, volume={337}, ISSN={["1095-9203"]}, DOI={10.1126/science.1224304}, abstractNote={A Fungal Culprit to Carbon Loss}, number={6098}, journal={SCIENCE}, author={Cheng, Lei and Booker, Fitzgerald L. and Tu, Cong and Burkey, Kent O. and Zhou, Lishi and Shew, H. David and Rufty, Thomas W. and Hu, Shuijin}, year={2012}, month={Aug}, pages={1084–1087} }
 @article{cheng_zhu_chen_zheng_oh_rufty_richter_hu_2010, title={Atmospheric CO2 enrichment facilitates cation release from soil}, volume={13}, ISSN={["1461-0248"]}, DOI={10.1111/j.1461-0248.2009.01421.x}, abstractNote={ Ecology Letters (2010) 13: 284–291}, number={3}, journal={ECOLOGY LETTERS}, author={Cheng, L. and Zhu, J. and Chen, G. and Zheng, X. and Oh, N. -H. and Rufty, T. W. and Richter, D. deB and Hu, S.}, year={2010}, month={Mar}, pages={284–291} }