Response of Stream Pollution Characteristics to Catchment Land Cover in Cao-E River Basin, China
Response of Stream Pollution Characteristics to Catchment Land Cover in Cao-E River Basin, China
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DOI：
10.1016/s1002-0160(10)60086-0
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发表时间：
2011-02-01
期刊：
影响因子：
5.7
通讯作者：
Shi Yi-Ming
中科院分区：
文献类型：
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作者：
Shen Ye-Na;Lue Jun;Shi Yi-Ming
研究了中国东部曹娥江完整水系的河流水污染特征与流域土地覆被和人类活动的关系。根据3年来逐月收集的水文地球化学数据，采用聚类分析和主成分分析对河段进行分类，揭示了河段的污染特征。根据河段水质及其流域土地利用方式和平均人口密度的不同，可将整个河系划分为非点源污染河段(NPSPR)、城市河段(UR)和混合源污染河段(MSPR)。在UR和MSPR中，水质主要受营养物质和有机污染的影响，而在NPSPR中，营养物质污染是主要原因。NPSPR以硝酸盐为主，MSPR以颗粒态磷为主。NPSPR和MSPR的污染物浓度随流量的变化趋势不明显，而UR的污染物浓度随流量的增加而降低。因此，旱季是乌鲁木齐市水污染控制的关键时期。因此，流域土地覆盖和人类活动对河段水污染类型、营养物质形态和水质对水文条件的响应具有重要影响，这可能是制定流域水污染防治战略的关键。
This study addressed the relationship of river water pollution characteristics to land covers and human activities in the catchments in a complete river system named Cao-E River in eastern China. Based on the hydrogeochemical data collected monthly over a period of 3 years, cluster analysis (CA) and principal component analysis (PCA) were adopted to categorize the river reaches and reveal their pollution characteristics. According to the differences of water quality in the river reaches and land use patterns and average population densities in their catchments, the whole river system could be categorized into three groups of river reaches, i.e., non-point sources pollution reaches (NPSPR), urban reaches (UR) and mixed sources pollution reaches (MSPR). In UR and MSPR, the water quality was mainly impacted by nutrient and organic pollution, while in NPSPR nutrient pollution was the main cause. The nitrate was the main nitrogen form in NPSPR and particulate phosphorus was the main phosphorus form in MSPR,. There were no apparent trends for the variations of pollutant concentrations with increasing river flows in NPSPR and MSPR, while in UR the pollutant concentrations decreased with increasing river flows. Thus dry season was the critical period for water pollution control in UR. Therefore, catchment land covers and human activities had significant impact on river reach water pollution type, nutrient forms and water quality responses to hydrological conditions, which might be crucial for developing strategies to combat water pollution in watershed scale.