Journal article

Publication year: 2022

Pages: 3791-3800

Journal: Environmental Science & Technology

Volume number: 56

Issue number: 6

ISSN: 0013-936X

eISSN: 1520-5851

DOI Link: https://doi.org/10.1021/acs.est.1c07997

Publisher: American Chemical Society

Abstract: 
Dissimilatory nitrate reduction to ammonium (DNRA), the nearly forgotten process in the terrestrial nitrogen (N) cycle, can conserve N by converting the mobile nitrate into non-mobile ammonium avoiding nitrate losses via denitrification, leaching, and runoff. However, global patterns and controlling factors of soil DNRA are still only rudimentarily known. By a meta-analysis of 231 observations from 85 published studies across terrestrial ecosystems, we find a global mean DNRA rate of 0.31 +/- 0.05 mg N kg(-1) day(-1), being significantly greater in paddy soils (1.30 +/- 0.59) than in forests (0.24 +/- 0.03), grasslands (0.52 +/- 0.15), and unfertilized croplands (0.18 +/- 0.04). Soil DNRA was significantly enhanced at higher altitude and lower latitude. Soil DNRA was positively correlated with precipitation, temperature, pH, soil total carbon, and soil total N. Precipitation was the main stimulator for soil DNRA. Total carbon and pH were also important factors, but their effects were ecosystem-specific as total carbon stimulates DNRA in forest soils, whereas pH stimulates DNRA in unfertilized croplands and paddy soils. Higher temperatures inhibit soil DNRA via decreasing total carbon. Moreover, nitrous oxide (N2O) emissions were negatively related to soil DNRA. Thus, future changes in climate and land-use may interact with management practices that alter soil substrate availability and/or soil pH to enhance soil DNRA with positive effects on N conservation and lower N2O emissions.

Harvard Citation style: Cheng, Y., Elrys, A., Merwad, A., Zhang, H., Chen, Z., Zhang, J., et al. (2022) Global Patterns and Drivers of Soil Dissimilatory Nitrate Reduction to Ammonium, Environmental Science & Technology, 56(6), pp. 3791-3800. https://doi.org/10.1021/acs.est.1c07997

APA Citation style: Cheng, Y., Elrys, A., Merwad, A., Zhang, H., Chen, Z., Zhang, J., Cai, Z., & Müller, C. (2022). Global Patterns and Drivers of Soil Dissimilatory Nitrate Reduction to Ammonium. Environmental Science & Technology. 56(6), 3791-3800. https://doi.org/10.1021/acs.est.1c07997