太湖五里湖富营养化的碳同位素记录  

Historical eutrophication in Wuli Bay of Taihu Lake, China based on carbon isoto pe record.

作　　者：李军 肖化云[1] 朱兆洲[2] 王仕禄[1] 王美丽[2] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]天津师范大学水环境与水资源重点实验室,天津300387

出　　处：《生态学杂志》2009年第11期2245-2249,共5页Chinese Journal of Ecology

基　　金：环境地球化学国家重点实验室开放课题和自主课题;国家自然科学基金项目(90610037);天津市科技发展计划项目(06YFSZSF05100);贵州省科学技术基金资助项目([2007]2167)

摘　　要：通过太湖五里湖表层沉积物柱样中总有机碳、总氮、总磷的变化,探讨了五里湖营养盐磷输入的历史记录,结合总有机碳碳同位素的分析,揭示了该湖富营养化和初级生产力的演化过程。总有机碳碳同位素值为-27.0‰～-26.3‰,平均-26.6‰,从底部向上波动变化,在深度12cm处最大,然后向上逐渐减小,5cm处降至最小,随之向上逐渐增大,反映了随着人为活动强度的加大,该湖水体富营养化程度逐渐加剧的特点,并且总有机碳碳同位素与有机碳、氮原子比值记录了湖泊水生植物群落由水草为主-草藻结合-藻类为主的演替过程。Through the analysis of total organic carbon, total nitrogen, and total phosphorus concentrations in surface sediment cores from Wuli Bay of Taihu Lake, the historical record of phosphate input in the Bay was studied, and in combining with the analysis of carbon isotope value of bulk sedimentary organic matter, the evolution process of the primary productivity and eutrophication in the Bay was revealed. The carbon isotope value of the sediment total organic C was -26. 6‰ on average, with a variation between -27. 0‰ and -26. 3‰. It was decreased with depth up to the lowest value at 5 cm, subsequently increased gradually up to the highest value at 12 cm, and then fluctuated downward with the depth, which suggested that the evolvement of eutrophication, productivity, and primary producer was associated with the increasing phosphorus input from human activities. Moreover, the concentrations of total phosphorus and the C/N atom＇ ic ratios of total organic carbon to total nitrogen recorded the succession process of aquatic plant community from float grass to float grass ＋ algae to algae.

关 键 词：总磷 C/N原子比值 碳同位素 富营养化 五里湖 

分 类 号：X524[环境科学与工程—环境工程]