太湖无锡湖区沉积物磷含量及其沉积通量

Study on the Concentration and Sedimentary Fluxes of Phosphorous in Sedimentary Cores From Taihu Lake(Wuxi)

采用210Pb法等测定了无锡太湖沿岸东五里湖、三山和鼋头渚等点采集的柱状沉积物样品的沉积速率、各形态磷含量,计算得到了各采样点的磷沉积通量.结果表明,东五里湖、三山和鼋头渚沉积物80年代后沉积速率分别为0.32、0.10和0.05 cm/a,其中东五里湖的沉积速率近几十年增加很快,磷沉积通量也急剧增加,最大达0.27 mg/(cm2.a),表明湖泊沉积物中高质量浓度的磷对其富营养化具有十分重要的影响.

The sedimentary cores were sampled from the sites named Dongwulihu, Sanshan and Yuantouzhu which are along the bank of Taihu I.ake（Wuxi region）in this study. The sedimentary rates of the 6 cores were determined by 210Pb method and the concentrations of various phosphorus species in sediments were also analyzed. The results showed that the sedimentary rates of Dongwulihu, Shanshan and Yuantouzhu were 0. 32, 0. 10 and 0. 05 cm/a, respectively. The phosphorus fluxes in sedimentary cores of Dongwulihu increased greatly in the last decades as well as its sedimentary rate, and the largest value was up to 0. 27 mg/（cm^2/a）. It can be regarded that the high concentration of phosphorous in lake sediments made great contribution to the eutrophication.