@article{li_yu_hao_qiu_hu_2023, title={Mycorrhizae enhance reactive minerals but reduce mineral-associated carbon}, volume={7}, ISSN={["1365-2486"]}, DOI={10.1111/gcb.16886}, abstractNote={Abstract}, journal={GLOBAL CHANGE BIOLOGY}, author={Li, Huan and Yu, Guang-Hui and Hao, Liping and Qiu, Yunpeng and Hu, Shuijin}, year={2023}, month={Jul} }
 @article{qiu_guo_xu_zhang_zhang_chen_zhao_burkey_shew_zobel_et al._2021, title={Warming and elevated ozone induce tradeoffs between fine roots and mycorrhizal fungi and stimulate organic carbon decomposition}, volume={7}, ISSN={["2375-2548"]}, DOI={10.1126/sciadv.abe9256}, abstractNote={Warming and elevated ozone alter root traits and mycorrhizal fungal community and stimulate organic carbon decomposition.}, number={28}, journal={SCIENCE ADVANCES}, author={Qiu, Yunpeng and Guo, Lijin and Xu, Xinyu and Zhang, Lin and Zhang, Kangcheng and Chen, Mengfei and Zhao, Yexin and Burkey, Kent O. and Shew, H. David and Zobel, Richard W. and et al.}, year={2021}, month={Jul} }
 @article{xiao_qiu_tao_zhang_chen_reberg-horton_shi_shew_zhang_hu_2020, title={Biological controls over the abundances of terrestrial ammonia oxidizers}, volume={29}, ISSN={["1466-8238"]}, DOI={10.1111/geb.13030}, abstractNote={Abstract}, number={2}, journal={GLOBAL ECOLOGY AND BIOGEOGRAPHY}, author={Xiao, Rui and Qiu, Yunpeng and Tao, Jinjin and Zhang, Xuelin and Chen, Huaihai and Reberg-Horton, S. Chris and Shi, Wei and Shew, H. David and Zhang, Yi and Hu, Shuijin}, year={2020}, month={Feb}, pages={384–399} }
 @article{zhang_zhang_yin_yang_zhao_jiang_tao_yan_qiu_guo_et al._2020, title={Combination of warming and N inputs increases the temperature sensitivity of soil N2O emission in a Tibetan alpine meadow}, volume={704}, ISSN={["1879-1026"]}, DOI={10.1016/j.scitotenv.2019.135450}, abstractNote={Many high-elevation alpine ecosystems have been experiencing significant increases in air temperature and, to a lesser extent, nitrogen (N) deposition. These changes may affect N-cycling microbes and enhance emissions of nitrous oxide (N2O, a potent greenhouse gas) from soil. However, few studies have investigated whether and how the resulting changes in N-cycling microbes may affect the temperature sensitivity (Q10) of N2O emission and in turn feed back to N2O emissions. We conducted two incubation experiments to examine N2O emissions and their temperature sensitivities in soils that had experienced 3-yr field treatments of warming, N inputs and their combination in a Tibetan alpine meadow. Our results showed that neither N inputs nor warming alone affected the rate or Q10 of soil N2O emission, but combining the two significantly increased both parameters. Also, combined N and warming significantly increased the abundance of ammonia-oxidizing bacteria (AOB), corresponding with high soil N2O emission. In addition, N2O emission from nitrification accounted for 60-80% of total emissions in all soils, indicating that nitrifying microbes dominated the N2O production and its temperature sensitivity. Using random forest (RF) and structural equation model (SEM) analyses, we further evaluated the effects of various soil characteristics on soil N2O emissions and Q10. We identified soil moisture, pH, N mineralization and AOB abundance as the main predictors of the Q10 of N2O emissions. Together, these findings suggest that alterations in soil moisture, pH and ammonia-oxidizing bacteria induced by long-term N inputs and warming may increase temperature sensitivity of soil N2O emissions, leading to a positive climate feedback in this high-altitude alpine ecosystem.}, journal={SCIENCE OF THE TOTAL ENVIRONMENT}, author={Zhang, Yi and Zhang, Nan and Yin, Jingjing and Yang, Fei and Zhao, Yexin and Jiang, Zhongquan and Tao, Jinjin and Yan, Xuebin and Qiu, Yunpeng and Guo, Hui and et al.}, year={2020}, month={Feb} }
 @article{zhang_zhang_yin_zhao_yang_jiang_tao_yan_qiu_guo_et al._2020, title={Simulated warming enhances the responses of microbial N transformations to reactive N input in a Tibetan alpine meadow}, volume={141}, ISSN={["1873-6750"]}, DOI={10.1016/j.envint.2020.105795}, abstractNote={Alpine ecosystems worldwide are characterized with high soil organic carbon (C) and low mineral nitrogen (N). Climate warming has been predicted to stimulate microbial decomposition and N mineralization in these systems. However, experimental results are highly variable, and the underlying mechanisms remain unclear. We examined the effects of warming, N input, and their combination on soil N pools and N-cycling microbes in a field manipulation experiment. Special attention was directed to the ammonia-oxidizing bacteria and archaea, and their mediated N-cycling processes (transformation rates and N2O emissions) in the third plant growing season after the treatments were initiated. Nitrogen input (12 g m−2 y−1) alone significantly increased soil mineral N pools and plant N uptake, and stimulated the growth of AOB and N2O emissions in the late growing season. While warming (by 1.4 °C air temperature) alone did not have significant effects on most parameters, it amplified the effects of N input on soil N concentrations and AOB abundance, eliciting a chain reaction that increased nitrification potential (+83%), soil NO3−-N (+200%), and N2O emissions (+412%) across the whole season. Also, N input reduced AOB diversity but increased the dominance of genus Nitrosospira within the AOB community, corresponding to the increased N2O emissions. These results showed that a small temperature increase in soil may significantly enhance N losses through NO3− leaching and N2O emissions when mineral N becomes available. These findings suggest that interactions among global change factors may predominantly affect ammonia-oxidizing microbes and their mediated N-cycling processes in alpine ecosystems under future climate change scenarios.}, journal={ENVIRONMENT INTERNATIONAL}, author={Zhang, Yi and Zhang, Nan and Yin, Jingjing and Zhao, Yexin and Yang, Fei and Jiang, Zhongquan and Tao, Jinjin and Yan, Xuebin and Qiu, Yunpeng and Guo, Hui and et al.}, year={2020}, month={Aug} }
 @article{qiu_jiang_guo_zhang_burkey_zobel_reberg-horton_shew_hui_2019, title={Shifts in the Composition and Activities of Denitrifiers Dominate CO2 Stimulation of N2O Emissions}, volume={53}, ISSN={["1520-5851"]}, DOI={10.1021/acs.est.9b02983}, abstractNote={Elevated atmospheric CO2 (eCO2) often increases soil N2O emissions but the underlying mechanisms remain largely unknown. One hypothesis suggests that high N2O emissions may stem from increased denitrification induced by CO2-enhancement of plant carbon (C) allocation belowground. However, direct evidence illustrating linkages among N2O emissions, plant C allocation and denitrifying microbes under eCO2 is still lacking. We examined the impact of eCO2 on plant C allocation to roots and their associated arbuscular mycorrhizal fungi (AMF) and its subsequent effects on N2O emissions and denitrifying microbes in the presence of two distinct N sources, ammonium nitrogen (NH4+- N) and nitrate nitrogen (NO3--N). Our results showed that the form of the N inputs dominated the effects of eCO2 on N2O emissions: eCO2 significantly increased N2O emissions with NO3--N inputs but had no effect with NH4+-N inputs. eCO2 increased plant biomass N more with NH4+-N than NO3--N inputs, likely reducing microbial access to available N under NH4+-N inputs and/or contributing to higher N2O emissions under NO3--N inputs. While eCO2 enhanced root and mycorrhizal N uptake, it also increased N2O emissions under NO3--N inputs. Further, eCO2-enhancement of N2O emissions under NO3--N inputs concurred with a shift in the soil denitrifier community composition in favor of N2O-producing (nirK- and nirS-type) over N2O-consuming (nosZ-type) denitrifiers. Together, these results indicate that eCO2 stimulated N2O emissions mainly through altering plant N preference in favor of NH4+ over NO3- and thus stimulating soil denitrifiers and their activities. These findings suggest that effective management of N sources may mitigate N2O emissions by negating eCO2-stimulation of soil denitrifying microbes and their activities.}, number={19}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Qiu, Yunpeng and Jiang, Yu and Guo, Lijin and Zhang, Lin and Burkey, Kent O. and Zobel, Richard W. and Reberg-Horton, S. Chris and Shew, H. David and Hui, Shuijin}, year={2019}, month={Oct}, pages={11204–11213} }
 @article{wu_chen_tu_qiu_burkey_reberg-horton_peng_hu_2017, title={CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions}, volume={106}, ISSN={["0038-0717"]}, DOI={10.1016/j.soilbio.2016.11.018}, abstractNote={Atmospheric carbon dioxide enrichment (eCO2) often increases soil nitrous oxide (N2O) emissions, which has been largely attributed to increased denitrification induced by CO2-enhancement of soil labile C and moisture. However, the origin of the N remains unexplained. Emerging evidence suggests that eCO2 alters plant N preference in favor of ammonium (NH4+-N) over nitrate (NO3−-N). Yet, whether and how this attributes to the enhancement of N2O emissions has not been investigated. We conducted a microcosm experiment with wheat (Triticum aestivum L.) and tall fescue (Schedonorus arundinaceus (Schreb.) Dumort.) to examine the effects of eCO2 on soil N2O emissions in the presence of two N forms (NH4+-N or NO3−-N). Results obtained showed that N forms dominated eCO2 effects on plant and microbial N utilization, and thus soil N2O emissions. Elevated CO2 significantly increased the rate and the sum of N2O emissions by three to four folds when NO3−-N, but not NH4+-N, was supplied under both wheat and tall fescue. While enhanced N2O emission was more related to the reduced plant NO3−-N uptake under wheat, it concurred with increased labile C under tall fescue. In the presence of NO3−-N, significantly lower shoot biomass N and 15N, but higher plant biomass C:N ratio, microbial biomass C and N, and/or soil extractable C indicated that eCO2 constrained plant NO3−-N utilization and likely stimulated root exudation. We propose a new conceptual model in which eCO2-inhibition of plant NO3−-N uptake and/or CO2-enhancement of soil labile C enhances the N and/or C availability for denitrifiers and increases the intensity and/or the duration of N2O emissions. Together, these findings indicate that CO2-enhancement of soil N and labile C favors denitrification, suggesting that management of N fertilizers in intensive systems will likely become more challenging under future CO2 scenarios.}, journal={SOIL BIOLOGY & BIOCHEMISTRY}, author={Wu, Keke and Chen, Dima and Tu, Cong and Qiu, Yunpeng and Burkey, Kent O. and Reberg-Horton, S. Chris and Peng, Shaolin and Hu, Shuijin}, year={2017}, month={Mar}, pages={9–17} }