Quantifying nitrogen leaching response to fertilizer additions in China's cropland
文献类型：SCI/SSCI论文
| 作者 | Gao S. S.; Xu, P.; Zhou, F.; Yang, H. ; Zheng, C. M.; Cao, W.; Tao, S.; Piao, S. L.; Zhao, Y.; Ji, X. Y.
|
| 发表日期 | 2016 |
| 关键词 | Nitrogen leaching Nonlinearity Variability Spatial pattern Bayesian inference n2o emissions nitrate groundwater model water losses soils denitrification contamination lysimeter |
| 英文摘要 | Agricultural soils account for more than 50% of nitrogen leaching (L-N) to groundwater in China. When excess levels of nitrogen accumulate in groundwater, it poses a risk of adverse health effects. Despite this recognition, estimation of L-N from cropland soils in a broad spatial scale is still quite uncertain in China. The uncertainty of L-N primarily stems from the shape of nitrogen leaching response to fertilizer additions (N-rate) and the role of environmental conditions. On the basis of 453 site-years at 51 sites across China, we explored the nonlinearity and variability of the response of L-N to N-rate and developed an empirical statistical model to determine how environmental factors regulate the rate of N leaching (LR). The result shows that L-N-N-rate relationship is convex for most crop types, and varies by local hydro-climates and soil organic carbon. Variability of air temperature explains a half (similar to 52%) of the spatial variation of LR. The results of model calibration and validation indicate that incorporating this empirical knowledge into a predictive model could accurately capture the variation in leaching and produce a reasonable upscaling from site to country. The fertilizer-induced L-N in 2008 for China's cropland were 0.88 +/- 0.23 TgN (1 sigma), significantly lower than the linear or uniform model, as assumed by Food and Agriculture Organization and MITERRA-EUROPE models. These results also imply that future policy to reduce N leaching from cropland needs to consider environmental variability rather than solely attempt to reduce N-rate. (C) 2016 Elsevier Ltd. All rights reserved. |
| 出处 | Environmental Pollution |
| 卷 | 211 |
| 页 | 241-251 |
| 语种 | 英语 |
| ISSN号 | 0269-7491 |
| DOI标识 | 10.1016/j.envpol.2016.01.010 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/42951]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Gao S. S.,Xu, P.,Zhou, F.,et al. Quantifying nitrogen leaching response to fertilizer additions in China's cropland. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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