摘要
对洱海全湖128km湖滨带及其外围敞水区水质进行了为期1a的调查研究.结果表明,洱海湖滨带总氮、氨氮、总磷、高锰酸盐指数年平均处于Ⅲ类水平,主要污染因子是总氮和总磷;湖滨带水质季节性变化表现为夏、秋季水质污染重于冬、春季,最重时期是11月.水质空间变化表现为北部污染重于南部,西部重于东部;临近村落、农田区湖滨带总氮、总磷、高锰酸盐指数浓度均明显高于临近林地、山地区湖滨带;强风浪水动力扰动下,湖滨带近岸(离岸0～60m范围,水深≤2.5m)区域水体总氮、总磷、高锰酸盐指数浓度均明显高于远岸(离岸70～190m范围,水深3.0～8.0m)区域,而在弱风浪下,离岸远近水质差异不明显.
Lake Erhai is a large,shallow freshwater plateau lake in Yunnan Province in S.W.China.The water quality of Lake Erhai was monitored along 128km aquatic-terrestrial ecotone of this lake from July 2009 to June 2010.Annual mean concentrations of total nitrogen（TN）,total phosphorus（TP）,and permanganate index（CODMn） in aquatic-terrestrial ecotone water were Ⅲ class level,and the major pollution resources were TN and TP.Pollution in aquatic-terrestrial ecotone water was worse in summer and autumn than in winter and spring.Pollution in north and western of aquatic-terrestrial ecotone were much higher than in southern and eastern respectively.Concentrations of TN,TP and CODMn in aquatic-terrestrial ecotone close to villages and farmlands were much higher than those near forest and mountain lands.Under strong wind-wave hydrodynamic force,concentrations of TN,TP and CODMn close to lake bank（less than 60m from lake bank,depth？2.5m） were significantly higher than those far away from lake bank（more than 60 m from lake bank,depth from 3.0m to 8.0 m）,however,under the weak wind-wave,there was no obvious differences between those two aeras.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2011年第7期1192-1196,共5页
China Environmental Science
基金
国家重大水专项洱海项目第4课题
关键词
水质
时空变化
植被恢复
湖滨带
洱海
water quality
spatial and temporal changes
aquatic-terrestrial ecotone
Lake Erhai
