%0 Journal Article
%T Effects of Land Use on Nitrogen Export in Xitiaoxi Watershed<br>西苕溪流域土地利用对氮素输出影响研究
%A LI Zhao-fu
%A YANG Gui-shan
%A LI Heng-peng
%A <br>李兆富
%A 杨桂山
%A 李恒鹏
%J 环境科学
%D 2006
%I 
%X The hydrological modeling and spatial analysis extensions of Arcview3.2 was used to delineate and select 11 representative sub-watersheds of Xitiaoxi River,a branch of Taihu Lake in China.Land use data derived from TM/ETM satellite images in 2000.Total nitrogen(TN) concentrations were measured 3 times in Jul.,Sep.and Dec.of 2004 within these sub-watersheds,to analyses temporalspatial characteristics of nitrogen concentrations and the effects of land use on nitrogen export.Results show TN concentration increase from upriver to downriver sub-watersheds and generally rising from Jul.to Sep.to Dec.,except upriver sub-watersheds have a contrary trend.It is due to TN concentrations vary greatly depending upon seasonal precipitation conditions and land use type and management across a watershed.Land use composition is a principal factor in controlling the amount of nitrogen exported from a watershed.Nitrogen export decrease with a higher percentage of forest land area,and the percentage of human-induced land use type such as arable land and residential area enlarge can increase the nitrogen export,whereas no relation was found between the size of sub-watersheds and TN concentrations.
%K xitiaoxi watershed
%K land use
%K nitrogen export<br>西苕溪流域
%K 土地利用
%K 氮素输出
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=EADF505ABC863A1A&yid=37904DC365DD7266&vid=DB817633AA4F79B9&iid=38B194292C032A66&sid=E3C3E274D87A8C16&eid=51F9E747BA1ACB45&journal_id=0250-3301&journal_name=环境科学&referenced_num=3&reference_num=12