Anthropogenic nitrogen sources and exports in a village-scale catchment in Southeast China

被引：13

作者：

Wenzhi Cao

Huasheng Hong

Yuzhen Zhang

Nengwang Chen

Yue Zeng

Weiping Wang

机构：

[1] Environmental Science Research Centre,State Key Laboratory of Marine Environmental Science, Ministry of Education

[2] Xiamen University,undefined

来源：

Environmental Geochemistry and Health | 2006年 / 28卷

关键词：

nitrogen export; nitrogen leaching; nitrogen sources;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：45 / 51

页数：6

共 100 条

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