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学科主题: Engineering ; Environmental; Environmental Sciences; Water Resources
题名: Temporal and spatial variations in kinetics of alkaline phosphatase 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: kinetics of alkaline phosphatase ; phosphatase in sediment ; seasonal variation ; P recycling in lake
刊名: WATER RESEARCH
发表日期: 2002
卷: 36, 期:8, 页:2084-2090
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: Monthly sediment and interstitial water samples were collected in a shallow Chinese freshwater lake (Lake Donghu) from three areas to determine if alkaline phosphatase activity (APA) plays an important role in phosphorus cycling in sediment. The seasonal variability in the kinetics of APA and other relevant parameters were investigated from 1995-1996. The phosphatase hydrolyzable phosphorus (PHP) fluctuated seasonally in interstitial water, peaking in the spring. A synchronous pattern was observed in chlorophyll a contents in surface water in general. The orthophosphate (o-P) concentrations in the interstitial water increased during the spring. An expected negative relationship between PHP and V-max of APA is not evident in interstitial water. The most striking feature of the two variables is their co-occurring, which can be explained in terms of an induction mechanism. It is argued that phosphatase activity mainly contributes to the driving force of o-P regeneration from PHP in interstitial water, supporting the development of phytoplankton biomass in spring. The V-max values in sediment increased during the summer, in Conjunction with lower K-m values in interstitial water that suggest a higher affinity for the substrate. The accumulation of organic matter in the sediment could be traced back to the breakdown of the algal spring bloom, which may stimulate APA with higher kinetic efficiency, by a combination of the higher V-max in sediments plus lower K-m values in interstitial water, in Summer. In summary, a focus On phosphatase and its substrate in annual scale may provide a useful framework for the development of novel P cycling, possible explanations for the absence of a clear relationship between PHP and APA were PHP released from the sediment which induced APA, and the presence of kinetically higher APA both in sediment and interstitial water which permitted summer mineralization of organic matter derived from the spring bloom to occur. The study highlighted the need for distinguishing functionally distinct extracellular enzymes between the sediment and interstitial water of lakes. (C) 2002 Elsevier Science Ltd. All rights reserved.
WOS记录号: WOS:000175807700018
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/9856
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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Zhou Yiyong; Li Jianqiu; Zhang Min.Temporal and spatial variations in kinetics of alkaline phosphatase in sediments of a shallow Chinese eutrophic lake (Lake Donghu),WATER RESEARCH,2002,36(8):2084-2090
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