摘要
通过对龙感湖沉积物样品中δ13Corg、δ15N、有机碳与总氮比值(C/N)、总有机碳(TOC)和总氮(TN)含量的测定,分析了自1948年以来龙感湖沉积物有机质的来源,探讨了湖泊生产力变化以及随后的沉积演化过程。结果表明:在这个沉积历史阶段中,湖泊沉积物有机质以自生有机物源为主,大型水草发育,伴有低等藻类参与,湖泊沉积物受陆源输入影响较小,基本不受城市污染物的输入影响,但受流域农业化肥大量使用的影响较大;随着营养物质的输入,湖泊的初级生产力逐渐增大,藻类开始发育;在沉积历史上L2点附近低等藻类相对发育早,但L1点沉积物相对能够固定更多的营养盐。
Through the determinations of δ^13Corg, δ^15N, total organic C, total N and C/N ratio in Longgan Lake sediments, this paper analyzed the sources of sedimentary organic matters in the Lake, variations of lake productivity, and evolution process of sediment since 1948. The results showed that the sedimentary organic matters mainly derived from native aquatic organic matters. The aquatic plants were float grasses accompaning with algae. Land matters and city pollutants had little influence, while large amounts of applied chemical fertilizers had great effects on the lake sediments. With the input of nutrients, the primary productivity of the lake increased, and algae began to flourish. In the sedimentary history, algae started to grow earlier in site L2 than in site L1, but the sediment in site L1 could fix more nutrients.
出处
《生态学杂志》
CAS
CSCD
北大核心
2007年第5期693-699,共7页
Chinese Journal of Ecology
基金
中国科学院知识创新工程重大资助项目(KZCX1-SW-12)
关键词
龙感湖
沉积物
有机碳同位素
氮同位素
有机质来源
沉积环境
Longgan Lake
sediment
organic carbon isotope
nitrogen isotope
organic matter sources
sediment environment.
