Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6327611 | Science of The Total Environment | 2015 | 9 Pages |
Abstract
Atmospheric nitrogen (N) deposition is an important component of the global N cycle, and is a key source of biologically available N. Understanding the spatio-temporal patterns and influencing factors of N deposition is essential to evaluate its ecological effects on terrestrial ecosystems, and to provide a scientific basis for global change research. In this study, we monitored the monthly atmospheric N deposition in rainfall at 41 stations from the Chinese Ecosystem Research Network through measuring total N (TN), total dissolved N (TDN), ammonium (NH4+-N), and nitrate (NO3â-N). The results showed that the atmospheric wet deposition of TDN, NH4+-N, and NO3â-N were 13.69, 7.25, and 5.93 kg N haâ 1 yrâ 1, respectively. The deposition of TN and total particulate N (TPN) was 18.02 and 4.33 kg N haâ 1 yrâ 1 respectively, in 2013. TPN accounted for 24% of TN, while NH4+-N and NO3â-N made up 40% and 33%, respectively, confirming the assumption that atmospheric wet N deposition would be underestimated without particulate N in rainfall. The N deposition was higher in Central and Southern China, and lower in North-west, North-east, Inner Mongolia, and Qinghai-Tibet regions. Precipitation, N fertilizer use, and energy consumption were significantly correlated with wet N deposition (all p < 0.01). Models that included precipitation and N fertilizer can explain 80-91% of the variability in wet N deposition. Our findings reveal, for the first time, the composition of the wet N deposition in China at different scales and highlight the importance of TPN.
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Authors
Jianxing Zhu, Nianpeng He, Qiufeng Wang, Guofu Yuan, Ding Wen, Guirui Yu, Yanlong Jia,