浙江省安吉县西部小流域非点源污染估算
Investigating Non-point Source Pollution in the Western Region of Anji County,Zhejiang Province
查看参考文献10篇
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文摘
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本文以浙江省安吉县西部地区为例, 以总氮作为污染评价指标, 利用优化后的输出系数法估算非点源污染, 并分析污染来源及特点, 为相关研究和决策提供数据和理论支持. 通过研究发现土地利用和降雨对流域 NSP贡献最大, 其次是农村人口和牲畜; 土地利用中以竹林和耕地的非点源污染输出为主. 就单位面积而言, 耕地对非点源污染输出贡献比例最大, 其次是园地、裸地、居民地、竹林、草地和林地. 此外, 不同的土地利用组合类型和比例对非点源污染输出也有着重要影响, 总体规律是随着耕地和居民地比例的增加, 其他林地比例的减少, 污染输出增大. 其中需要注意的是", 竹林-耕地-林地"混合类型比竹林单一土地利用类型的单位面积污染输出更小, 由此推断在耕地中适当的载植林木可以有效的降低非点源污染的输出 |
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其他语种文摘
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Non-point source pollution(NSP)is one of the most important contributors to water quality deterioration.In the present paper,the authors investigated the NSP across western Anji County in Zhejiang Province using an improved export coefficient method in combination with the total nitrogen taken as a pollution assessment index,to estimate the pollution load of NSP occurring in every townships and the entire study area.We also analyzed the sources and characteristics of the pollution,with the aim to provide meaningful data and a theoretical basis for decision-making in NSP control.It was found that the largest contributor of the pollution comes from land use and rainfall,followed by rural population and livestock.The largest NSP export of land use appears to be bamboo forest and cultivated land.As far as the single land use type is concerned,the non-point source pollution export of cultivated land is largest,followed by garden, bare area,settlements,bamboo forest,grass,and woodland in a descending order.It was also found that the primary pollution of the cultivated land arises from fertilizer.As such,appropriate control of the overall amount of fertilizer would be an effective way to substantially reduce pollution. Moreover,the NSP export of land use which is frequently influenced and shaped by human activities is more serious than that from the natural land use.Furthermore,different types and ratios of land use combination have a significant influence on NSP export.In general,as woodland decreases and cultivated land and settlements increase,the non-point source pollution export increases gradually.It is particularly noted that the combination of "bamboo forest,cultivated land, and woodland"shows a lower NSP export in unit area than the single bamboo forest.To that end, the NSP export could be decreased effectively if there is some woodland planted in the cultivated land.The amount of NSP export is closely related to the area of a study site,but there does not exist a marked relationship between pollution export concentration and the area of the study site. Therefore,when making land use planning,a multitude of factors,including the pattern of land use and the combination of land use types and the ratios of land use,need to be comprehensively considered.An appropriate combination of land use plays a critical role in reducing NSP and can be conductive to sustainable development |
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来源
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资源科学
,2011,33(2):242-248 【核心库】
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关键词
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小流域
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非点源污染
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总氮
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土地利用结构
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地址
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中国科学院地理科学与资源研究所, 资源与环境信息系统国家重点实验室, 北京, 100101
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-7588 |
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学科
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能源与动力工程 |
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基金
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国家重大科技专项
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文献收藏号
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CSCD:4130725
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