摘要
以太湖流域宜兴段的3条主要入湖港口为研究对象,通过实地调查和数据分析,探讨了入湖港口景观格局对河流水质的影响。反映景观格局的指标有港口周边5 km缓冲区域内的"源-汇"景观空间负荷对比指数(LCI)、斑块数量(NP)、边界密度(ED)、蔓延度指数(CONT)、香浓多样性指数(SHDI)和聚集度指数(AI);反映水质变化的主要指标为总氮(TN)、总磷(TP)和化学需氧量(CODMn)。以水质指标为因变量,对二者做了相关性分析和通径分析,结果表明,LCI与TN、TP和CODMn关系显著,对它们的直接作用分别为0.266、1.512和0.979;ED对TN、CODMn和NH+4-N有显著影响,直接作用为0.740、-0.189和0.852;TN和NH+4-N与CONT相关性显著,与SHDI呈负的极显著相关;对TN和NH+4-N来说,两个景观格局指标(LCI与景观格局指数)对它们都呈直接负作用;其它指标之间关系不显著。这说明景观格局变化对区域内港口水质有一定影响,合理配置景观格局能够有效地治理面源污染,改善水质状况。
With rapid socio-economic development in the Taihu Lake Basin,pollution of Taihu Lake water is increasingly getting more serious.Thus government at all levels has allocated considerable resources（money and manpower） to this issue in the Taihu Lake Basin.As a result of their efforts,point source pollution has been better controlled around the basin.But non-point source pollution is still serious due to its dispersion and concealment,and its random nature,and consequent difficult monitoring.So it is still the key to resolving pollution in the basin and is a difficult point to which attention needs to be paid both currently and in the future.The non-point source pollution is the result of multiple factors such as soil,topography,hydrology,socio-economic development,management methods and land use,and it is closely related to the landscape distribution pattern.Reasonable landscape distribution can improve water quality by reducing the output of non-point source pollution,and hindering the transfer of watershed pollutants to receiving waters.Landscape pattern index can also be a good description of landscape heterogeneity,and the location-weighted landscape contrast index（LCI） can quantify non-point source pollution.However,little work has been done on the concrete relationship between the water quality index and the landscape index. In order to investigate responses of water quality to landscape pattern in the Taihu Basin watershed,3 typical streams connected to Taihu Lake in Yixing City were chosen as test plots.Indicators which reflect landscape characteristics such as source-sink landscape location-weighted Landscape Contrast Index（LCI）,Number of Patches（NP）,Edge Density（ED）,Contagion Index（CONT）,Shannon′s Diversity Index（SHDI） and Aggregation Index（AI） were analyzed.Some parameters which reflect water quality such as Total Nitrogen（TN）,Total Phosphorus（TP）,and Chemical Oxygen Demand（CODMn） were also measured.Correlation analysis and path analysis between the landscape
出处
《生态学报》
CAS
CSCD
北大核心
2012年第20期6422-6430,共9页
Acta Ecologica Sinica
基金
林业公益性行业科研专项(201104055)
江苏省科技项目(BE2009603
BE2008636)
2010年浙江省林业科技项目
关键词
“源-汇”景观空间负荷对比指数
景观格局指数
相关性分析和通径分析
水质指标
the source-sink landscape location-weighted landscape contrast index（LCI）
landscape pattern index
correlation analysis and path analysis
water quality
