杭州西湖底泥磷分级分布

Profiles of Phosphorus Fractions in the Sediments of West Lake, Hangzhou

采用磷分级分离法对在杭州西湖采集的柱状泥样进行了磷分级提取 .结果发现 :HCl-rP即钙矿磷占据了西湖底泥总磷含量的 30 %- 70 %,其余依次为NaOH -rP(16%- 40 %)和NH4 Cl-rP(0 .6%- 10 %) ;活性磷由NaOH -rP和NH4 Cl -rP构成 ,占总沉积磷的 2 0 %-40 %.各磷分级组分和活性磷的垂直分布与总磷基本一致 ,含量随泥层深度的降低逐级增加 ,在 10- 30cm处形成峰值 ,但表层的蓄积量又出现逐层下降的趋势 .

A 70cm-sediment core was collected from West Lake, an eupertrophic lake, Hangzhou, P.R.China. Samples were studied by the fraction procedure of Hieltjies & Lijklema (1980) to obtain the phosphorus fractional profiles. In the sediment, the largest part of phosphorus (30%-70%) was bound to calcium, while Fe&Al bound P (NaOH-rP) and loosely absorbed P (NH 4Cl-rP) holding about 16%-40% and 0.6%-10% separately; labile phosphorus comprised of 20%-40% of the particulate phosphorus at the time of deposition. The vertical distribution of P fractions and labile phosphorus were similar with that of total phosophorus. In the deep part of sediment the contents increased with the decrease of depth; the peaks all appeared in the layers of between 10-30cm; while in the upper layers a decline with depth was presented.