基于地形指数的流域非点源磷素输出关键源区识别  

Identifying Critical Source Areas of Non-point Source Phosphorus Export Based on Topographic Index

作　　者：王妞[1,2] 陆海明[1] 邹鹰[1] 陈晓燕[1] 朱乾德[1] 

机构地区：[1]南京水利科学研究院水文水资源与水利科学国家重点实验室,江苏南京210029 [2]河海大学水文水资源学院,江苏南京210098

出　　处：《水文》2016年第2期12-16,22,共6页Journal of China Hydrology

基　　金：水利部公益性行业科研专项(201201026);南京水利科学研究院基本科研业务费专项资金项目(Y512009;Y513011;Y515002)

摘　　要：以非点源污染形式输出的磷素是导致水体富营养化的主要原因,识别流域磷素输出的关键源区并进行重点整治是控制流域非点源磷素污染的重要手段。以修正的磷指数法为基础,引入地形指数因子,建立了流域非点源磷素输出风险评价方法,并以位于江淮丘陵区的西源流域为例开展了磷素输出风险评价,识别了该流域磷素输出的关键源区。结果表明,西源流域磷素输出关键源区主要集中在下游河道、沟渠两侧农田区域,占流域总面积的8%。Phosphorus export via non-point source plays a vital role in the eutrophication of water body. Identification of phospho-rus export critical source areas could help mitigate and control non-point source phosphorus export. The critical source area assess-ment method based on the modified phosphorus index was established, considering topographical index. Xiyuan watershed located in Yangtze-Huaihe transition region was selected as a case study area. The results show that critical source area of phosphorus export only occupies 8% of the total catchment area, and mainly distributed in the cropland close to the stream in lower reaches.

关 键 词：非点源污染 关键源区 磷指数法 地形指数 输出风险 

分 类 号：X522[环境科学与工程—环境工程]