Cao Wenzhi, Hong Huasheng, Zhang Yuzhen, Chen Nengwang, Zeng Yue, Wang Weiping
State Key Laboratory of Marine Environmental Science, Ministry of Education, Environmental Science Research Centre, Xiamen University, 361005 Xiamen, China.
Environ Geochem Health. 2006 Feb-Apr;28(1-2):45-51. doi: 10.1007/s10653-005-9010-4.
An experimental village-scale catchment was selected for investigation of nitrogen (N) sources and exports. The mean N application rate over the catchment was 350.2 kg N ha(-1), but this rate varied spatially and temporally. The N leaching loss rate varied from 8.1 to 52.7 kg N ha(-1) under different land use regimes. The average N leaching loss rate was 13.4 kg N ha(-1) over the whole catchment, representing about 3.8% of the total N inputs. The N export rate through stormflows was 28.8 kg N ha(-1), about 8.2% of the total N inputs. Seasonal patterns showed that 95% of N exports through stormflows occurred during July to September in 2002. Overall, the maximum riverine N exports were 12.1% of total N inputs and 15.5% of the inorganic fertilizer N applied. Understanding N sources and exports in a village-scale catchment can provide a knowledge base for amelioration of diffuse agricultural pollution.
选取了一个实验性的村庄尺度集水区来调查氮（N）源和输出情况。整个集水区的平均施氮率为350.2千克氮/公顷，但该率在空间和时间上有所变化。在不同土地利用方式下，氮淋失率在8.1至52.7千克氮/公顷之间变化。整个集水区的平均氮淋失率为13.4千克氮/公顷，约占总氮输入量的3.8%。通过暴雨径流的氮输出率为28.8千克氮/公顷，约占总氮输入量的8.2%。季节性模式表明，2002年7月至9月期间，95%的通过暴雨径流的氮输出发生。总体而言，河流中氮的最大输出量占总氮输入量的12.1%，占施用无机氮肥的15.5%。了解村庄尺度集水区的氮源和输出情况可为减轻农业面源污染提供知识基础。
