水生态学杂志Issue(4)：57-62,6.DOI:10.15928/j.1674-3075.2015.04.008
杭州西湖表层沉积物中水溶性有机碳含量的时空分布特征
Spatial and Temporal Variations of Water-soluble Organic Carbon in Surface Sediments of West Lake,Hangzhou
摘要
Abstract
Water-soluble organic carbon(WSOC)is the critical component of organic carbon in lake sediments,and plays an important role in lake ecology.Research has shown that an increase of WSOC in sediments and lakes has a significant effect on water quality.Hangzhou′s West Lake is world famous,but also suffers from eutrophication. In this study,water-soluble organic carbon (WSOC)concentrations in surface sediments were investigated in differ-ent areas of West Lake over an entire year and the aim of the study is to understand the WSOC levels in different ar-eas of the lake,explore factors accounting for the dynamic variation of WSOC and supply basic data to support re-mediation of West Lake.A total of 13 sampling sites were selected:6 sampling sites in the western section (Mao-jiabu (MY,MW),Wuguitan (WY,WW),Yuguwan (YY,YW);2 sampling sites at Xiaonan Lake (NY,NW);1 site each in the open waters of Xili Lake (XL),Beili Lake (BL)and West Lake (HC),1 site in a bay of West Lake (HW)and 1 site at the Yuehu Lake (YH).Surface sediment samples (0 -10)cm were taken in December (winter)of 2013,April (spring),June (summer)and October (autumn)of 2014.The improved method of Xi Danli was used to analyze WSOC concentrations in the sediments with a total organic carbon (TOC)analyzer.Re-sults are as follows:The mean concentration of WSOC in surface sediments was 387.1 mg/kg with significant differ-ences among the seasons;Average concentrations for Spring,Winter,Summer and Autumn were,respectively, 437.5 mg/kg,436.6 mg/kg,405.0 mg/kg,269.4 mg/kg,displaying much lower levels in autumn;Spatial vari-ation occurred during each season.The average WSOC concentration (388.5 mg/kg)in submerged macrophyte restoration areas (MY,WY,YY)was higher than in areas (MW,WW,YW)without submerged macrophytes (304.6 mg/kg),but the difference was not significant.This is likely because there are no strict boundaries be-tween vegetated and non-vegetated areas to influence water flow.However,the average value (346.6 mg/kg)of WSOC in the western area of West Lake,where macrophyte restoration was carried out,was significantly lower than other areas (432.3 mg/kg),indicating that submerged vegetation restoration reduces WSOC content in surface sed-iments.关键词
西湖/表层沉积物/水溶性有机碳/季节动态Key words
West Lake/surface sediments/water-soluble organic carbon/seasonal dynamics分类
资源环境引用本文复制引用
王艳云,王川,徐思,张丹,曾磊,贺锋,周巧红,吴振斌..杭州西湖表层沉积物中水溶性有机碳含量的时空分布特征[J].水生态学杂志,2015,(4):57-62,6.基金项目
国家“十二五”水专项（2012ZX07101007-005）；国家自然科学基金（31123001；51208498；51308530）。 （）
