长江流域资源与环境 >> 2014, Vol. 23 >> Issue (01): 75-.doi: 10.11870/cjlyzyyhj201401011

• 生态环境 • 上一篇    下一篇

湿沉降对湖泊水质及初级生产力的影响

胡洋|余辉|李中强   

  1. (1.湖北大学资源环境科学学院|湖北 武汉 430062;2.中国环境科学研究院湖泊生态环境创新基地|北京 100012)
  • 出版日期:2014-01-20

EFFECTS OF WET DEPOSITION ON WATER QUALITY AND PRIMARY PRODUCTIVITY IN THE MEILIANG BAY OF LAKE TAI

HU Yang1,2,YU Hui2,LI Zhongqiang1   

  1. (1.Faculty of Resources and Environmental Science,HuBei University Wuhan 430062,China;
    2.Research Center of Lake Environment,Chinese Research Academy of Environmental Science,Beijing 100012,China)
  • Online:2014-01-20

摘要:

研究大气湿沉降对湖泊水质及初级生产力的影响对于探讨湖泊富营养化形成机理及其治理和修复具有重要意义。通过控制其是否接受湿沉降来探讨其对湖泊水质及初级生产力的影响,结果表明:(1)湿沉降以N沉降为主,两次湿沉降中N沉降分别占9912%和9893%,其中N沉降中NH4+N含量较高,分别为190和269 mg/L,P沉降以及Si沉降相对较少;(2)湿沉降所携带的高浓度NH4+N使得接受湿沉降围隔水体中NH4+N浓度在降雨前后变化十分显著,在两次湿沉降中分别增长了231倍和187倍,而风浪促使沉积物DSi释放使得未接受湿沉降围隔水体中DSi浓度在降雨前后变化显著,在两次湿沉降中分别增长了158倍和162倍;(3)正常接受湿沉降围隔组在降雨前后其初级生产力有显著差异,初级生产力增长明显:第一次湿沉降实验中,3个时间段分别增长了19130%、5208%和10000%,第二次湿沉降中,3个时间段的初级生产力分别增加了10542%、7396%和6162%;而未接受湿沉降的围隔组其初级生产力变化无显著性差异。分析结果表明大气湿沉降对湖泊水体水质、初级生产力及其日变化影响显著

Abstract:

Researches on  effects of wet deposition on water quality and primary productivity are meaningful to understand the mechanism of eutrophication and recovery of lake ecosystem.In June,2012,phytoplankton primary productivity is determined by means of dark and light bottle method (Winkler method) from six insitu enclosures in the Meiliang Bay of Lake Tai.Simultaneously,total nitrogen,total phosphorus,ammonium,nitrate and silicate were also measured.,The results show that. (1) N deposition gives the first place in the wet deposition,N deposition account for 99.12% and 98.93% in two wet deposition.And the concentration of ammonium is higher than nitrate,while P deposition as well as Si deposition are negligible;(2) high concentration of ammonium carried by the rain caused a higher concentration of ammonium in enclosures after wet deposition.Since stormy wave may promote the DSi to release from the sediment,this maybe the reason why the concentration of DSi also changed significantly in the enclosures which was not accepting the wet deposition before and after the wet deposition;(3)There was a remarkable change in primary productivity and daily variation of primary productivity in enclosures receiving wet deposition.The increase of primary productivity is obvious,in the first wet deposition,the primary productivity increases 191.30%,52.08% and 100.00% in three different time periods;while in the second wet deposition,the primary productivity increases105.42%,73.96% and 61.62%.But the primary productivity of the encloses not accepting wet deposition does not change significantly.Because of the wet deposition,the N:P in enclosures accepting wet deposition became more suitable for phytoplankton growth.The analysis results indicate that the wet deposition has obvious effects on the water quantify and primary productivity

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