云南阳宗海大气氮、磷沉降特征  

Atmospheric deposition of nitrogen and phosphorous in Lake Yangzonghai,Yunnan Province

作　　者：余功友 杨常亮[2] 刘楷 杨海燕[4] 张佳丽[4] 

机构地区：[1]云南大学建筑与规划学院,昆明650091 [2]云南大学生态学与环境学院,昆明650091 [3]云南平正环保科技有限公司,昆明650221 [4]云南大学国际河流与生态安全研究院,昆明650091

出　　处：《湖泊科学》2017年第5期1134-1142,共9页Journal of Lake Sciences

基　　金：国家自然科学基金项目(51168047)资助

摘　　要：大气氮、磷沉降是湖泊水体氮、磷入湖的重要途径之一.为了解阳宗海氮、磷沉降对湖泊富营养化的潜在影响,于2012年5月-2014年4月通过监测阳宗海大气氮、磷沉降,估算氮、磷的大气沉降通量,揭示阳宗海大气氮、磷沉降随时间变化的特征,分析其来源、影响因素等.由于阳宗海是磷限制湖泊,本研究在估算大气氮、磷沉降通量的基础上,特别比较了大气磷沉降入湖量与非点源磷的入湖量,以此评估大气沉降输入磷对湖泊富营养化的潜在影响.研究结果表明:阳宗海总氮年平均沉降通量为248 mg/m^2,春、夏、秋和冬季平均分别为200、306、274和214 mg/m^2,其中夏季沉降通量最大,原因与降雨量增加有关;总磷年平均沉降通量为24 mg/m^2,春、夏、秋和冬季平均分别为18、31、19和27 mg/m^2.大气磷沉降与输入阳宗海的总磷量相比很小,对阳宗海富营养化影响较小.Atmospheric deposition is one of the important pathways for nitrogen（ N） and phosphorus（ P） transported into lakes.To understand the potential impact of N and P from atmospheric depositions on the eutrophication of Lake Yangzonghai,this research investigated the temporal variation and estimated the fluxes of N and P from atmospheric depositions in the lake catchment.The sources and impact factors of the N and P depositions were analyzed by monitoring data from May 2012 to April 2014. Since Lake Yangzonghai is a P-limited lake,this study especially compared the P fluxes from N and P atmospheric deposition with that from non-point sources,and assessed the potential P-impact from atmospheric deposition on the eutrophication lake. The results showed that the average annual deposition flux of total nitrogen was 248 mg/m^2,and seasonal deposition fluxes in spring,summer,autumn and winter were 200,306,274 and 214 mg/m^2,respectively. The peak of N flux occurred in summer because of the increased rainfall. The annual average P deposition flux was 24 mg/m^2,and seasonal deposition fluxes in spring,summer,autumn and winter were 18,31,19 and 27 mg/m^2,respectively. Compared with the non-point P-load source,P-input from atmospheric deposition seemed very small,and would have little effect on the eutrophication of the lake.

关 键 词：大气沉降 氮 磷 阳宗海 

分 类 号：X51[环境科学与工程—环境工程]