Spatial and temporal variations in nitrogen retention effects in a subtropical mountainous basin in Southeast China
Spatial and temporal variations in nitrogen retention effects in a subtropical mountainous basin in Southeast China
复制标题
中国东南部亚热带山地盆地氮滞留效应的时空变化
DOI：
10.1007/s11629-020-6254-5
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发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Deng Hai-jun
中科院分区：
文献类型：
--
作者：
Liu Mei-bing;Chen Xing-wei;Chen Ying;Gao Lu;Deng Hai-jun
流域内的氮滞留减少了向海洋输出的氮量；然而，它却加剧了环境问题，包括地表水富营养化、含水层污染、酸雨和土壤酸化。在这里，我们采用水土评估工具（SWAT）模型来描述山美水库盆地（位于中国东南部泉州市的一个亚热带山地盆地）的河流氮输出和滞留效应。结果表明，流域上游和中部地区的农田和果园是主要的土地利用类型，氮产量贡献较大。施肥是河流氮输出和流域内氮保留的主要来源。平均而言，大约 64% 的人为氮输入被保留在流域内，而总氮的 36% 被输出到下游和沿海地区。干旱年份平均氮保留效率为80%，年内春、夏季氮保留，秋、冬季氮释放。流域内氮保留的年变化主要受降雨和径流变化的影响，而氮保留的季节特征主要受施肥的影响。即使在施肥量大幅减少的情况下，由于残氮库和河流本底的贡献，河流氮输出量仍保持一定的基值。应综合考虑降水量、土地利用类型、农用肥料等对氮素滞留的影响，实施合理的氮素管理措施。
Nitrogen retention within a watershed reduces the amount of N exported to the ocean; however, it worsens environmental problems, including surface water eutrophication, aquifer pollution, acid rain, and soil acidification. Here, we adopted the Soil and Water Assessment Tool (SWAT) model to describe the riverine N output and retention effects in the Shanmei Reservoir Basin, a subtropical mountainous basin located in Quanzhou City, Southeast China. The results revealed that farmlands and orchards in the upstream and central parts of the basin were the dominant land use types, which contributed large N yields. Fertilizer application was the key source of riverine N output and N retention within the basin. On average, approximately 64% of anthropogenic N inputs were retained within the basin, whereas 36% of total N was exported to the downstream and coastal areas. The average N retention efficiency was 80% in a dry year, and within the year, N retention occurred in spring and summer and N release occurred in autumn and winter. The annual variation in N retention within the basin was largely dominated by changes in rainfall and runoff, whereas the seasonal characteristics of N retention were mainly affected by fertilization. Even with a large decrease in fertilizer application, owing to the contributions of the residual N pool and river background, the riverine N output still maintained a certain base value. The effects of precipitation, land use types, and agricultural fertilizer on N retention should be comprehensively considered to implement reasonable N management measures.
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影响因子：
6.7
作者：
C. V. Stechow;J. Minx;K. Riahi;J. Jewell;D. McCollum;M. Callaghan;J. Leon;A. Grinham;J. Church;B. Gibbes;C. Woodroffe;J. Canadell
通讯作者：
C. V. Stechow;J. Minx;K. Riahi;J. Jewell;D. McCollum;M. Callaghan;J. Leon;A. Grinham;J. Church;B. Gibbes;C. Woodroffe;J. Canadell
影响因子：
4
作者：
Howarth, R. W.;Swaney, D. P.;Goodale, C.
通讯作者：
Goodale, C.
影响因子：
3.8
作者：
Yi Chen;Jiabing Shuai;Zhao Zhang;P. Shi;F. Tao
通讯作者：
Yi Chen;Jiabing Shuai;Zhao Zhang;P. Shi;F. Tao
DOI：
--
发表时间：
1970
期刊：
--
影响因子：
--
作者：
Surface-Applied Urea
通讯作者：
Surface-Applied Urea
影响因子：
2.4
作者：
Atsushi Hayakawa;Mariko Shimizu;K. Woli;Kanta Kuramochi;R. Hatano
通讯作者：
Atsushi Hayakawa;Mariko Shimizu;K. Woli;Kanta Kuramochi;R. Hatano