Characteristics of Agricultural Non-point Source Pollution in Bio-climatic Division in Hainan Island,China
Characteristics of Agricultural Non-point Source Pollution in Bio-climatic Division in Hainan Island,China
复制标题
海南岛生物气候分区农业面源污染特征
DOI：
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发表时间：
2011
影响因子：
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通讯作者：
Tang Wen
中科院分区：
文献类型：
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作者：
Tang Wen
农业非点源污染在我国大面积地区广泛存在，已成为一个严重的环境问题。了解农业非点源污染的地理分布规律，对于制定合理的农业非点源污染控制措施具有重要意义。本文研究了不同生物量条件下农业非点源污染的输出系数及其特征，并对农业非点源污染的影响因素进行了分析。结果表明，农业非点源污染的输出系数与农业非点源污染的输出系数基本一致，而农业非点源污染的输出系数与农业非点源污染的输出系数基本一致，农业非点源污染的输出系数与农业非点源污染的输出系数基本一致，农业非点源污染的输出系数与农业非点源污染的输出系数基本一致，农业非点源污染的输出系数与农业非点源污染的输出系数基本一致。采用模拟降雨与农田径流小区相结合的方法对海南岛进行气候区划。（1）土壤径流系数随生物气候分区的不同而变化，表现为半湿润区>湿润区，（2）半湿润区、湿润区和湿润区存在潜在的土壤侵蚀;（3）农田土壤氮素主要通过地表径流流失，磷素主要通过泥沙流失;（4）暴雨（2.55 mm·min-1）可显著增加污染物的侵蚀速率。
Agricultural non-point pollution widely spreads and has led to a serious environment problem in the lager area of China.Better understanding of the geographical distribution of agricultural non-point pollution is vital to establish reasonable control measures for alleviating the issue.This paper studied the output coefficient and characteristics of agricultural non-point pollution in different bio-climatic division using method of simulative rainfall combined with farmland runoff plots in Hainan Island.The results suggested that;(1)soil runoff coefficient varied with bio-climatic division and was observed in semi-moist region then followed by moist region,damp region and semi-arid region sequentially;(2)potential soil erosion existed in semi-moist region,damp region and moist region;(3)soil nitrogen in field was mainly lost through surface runoff,while it was through sediment loss for phosphorus;(4)rainstorm(2.55 mm·min-1) could significantly increase erosion rate of pollutants.