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学科主题: Marine & Freshwater Biology
题名: Vertical variations in kinetics of alkaline phosphatase and P species in sediments of a shallow Chinese eutrophic lake (Lake Donghu)
作者: Zhou Yiyong ; Li Jianqiu & Zhang Min
通讯作者: Zhou, YY, Chinese Acad Sci, Inst Hydrobiol, Lake Donghu Ecosyst Expt Stn, Wuhan 430072, Peoples R China
关键词: vertical distribution ; sediment ; kinetics of alkaline phosphatase ; P fractionation ; eutrophic lake
刊名: HYDROBIOLOGIA
发表日期: 2001
卷: 450, 期:1-3, 页:91-98
收录类别: SCI
部门归属: Chinese Acad Sci, Inst Hydrobiol, Lake Donghu Ecosyst Expt Stn, Wuhan 430072, Peoples R China
摘要: The vertical distribution of the variables relevant to P forms in sediments were studied in a shallow Chinese freshwater lake (Lake Donghu) in 1997, 1998, 1999 and 2000, to assess the contribution of enzyme to P availability in sediment cores. Sediment P was fractionationd into iron-bound P, calcium-bound P, acid soluble organic P (ASOP) and hot NaOH extractable residual organic P. The former two species made the largest contribution to the sediment P pool. All P species exhibited significantly higher concentrations in different depths at Station I, compared with those found at Station II, except for ASOP. Coupled with these lower ASOP concentrations, the V-max data of alkaline phosphatase, measured on the same samples, were significantly higher at station I. Taken together, ASOP were probably important in supplying the enzymatic substrate (Phosphatase Hydrolyzable Phosphorus, PHP) into interstitial water. Dissolved orthophosphate and PHP concentrations were highly heterogeneous , but peaked in subsurface, paralleled by higher V-max and lower K-m values of alkaline phosphatase, throughout the sediment core. Sediment in the eutrophic lake is not only enriched in available P (iron-bound P), or stores residual P, but also tends to release PHP, thereby inducing the production of alkaline phosphatase and releasing o-P into water column by enzymatic hydrolysis. The latter process may also occur in relatively deep sediment layers.
WOS记录号: WOS:000170963600009
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/9944
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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Recommended Citation:
Zhou Yiyong; Li Jianqiu & Zhang Min.Vertical variations in kinetics of alkaline phosphatase and P species in sediments of a shallow Chinese eutrophic lake (Lake Donghu),HYDROBIOLOGIA,2001,450(1-3):91-98
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