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Biological mechanisms driving the seasonal changes in the internal loading of phosphorus in shallow lakes
Xie Ping; Xie, P, Chinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2006-04-01
Source PublicationSCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN1006-9313
Volume49Pages:14-27
AbstractBecause of the obvious importance of P as a nutrient that often accelerates growth of phytoplankton (including toxic cyanobacteria) and therefore worsens water quality, much interest has been devoted to P exchange across the sediment-water interface. Generally, the release mode of P from the sediment differed greatly between shallow and deep lakes, and much of the effort has been focused on iron and oxygen, and also on the relevant environmental factors, for example, turbulence and decomposition, but a large part of the P variation in shallow lakes remains unexplained. This paper reviews experimental and field studies on the mechanisms of P release from the sediment in the shallow temperate (in Europe) and subtropical (in the middle and lower reaches of the Yangtze River in China) lakes, and it is suggested that pH rather than DO might be more important in driving the seasonal dynamics of internal P loading in these shallow lakes, i.e., intense photosynthesis of phytoplankton increases pH of the lake water and thus may increase pH of the surface sediment, leading to enhanced release of P (especially iron-bound P) from the sediment. Based on the selective pump of P (but not N) from the sediment by algal blooms, it is concluded that photosynthesis which is closely related to eutrophication level is the driving force for the seasonal variation of internal P loading in shallow lakes. This is a new finding. Additionally, the selective pump of P from the sediment by algal blooms not only explains satisfactorily why both TP and PO4-P in the hypereutrophic Lake Donghu declined significantly since the mid-1980s when heavy cyanobacterial blooms were eliminated by the nontraditional biomanipulation (massive stocking of the filter-feeding silver and bighead carps), but also explains why TP in European lakes decreased remarkably in the spring clear-water phase with less phytoplankton during the seasonal succession of aquatic communities or when phytoplankton biomass was decreased by traditional biomanipulation. Compared with deep lakes, wax and wane of phytoplankton due to alternations in the ecosystem structure is also able to exert significant influences on the P exchange at the sediment-water interface in shallow lakes. In other words, biological activities are also able to drive P release from sediments, and such a static P release process is especially more prominent in eutrophic shallow lakes with dense phytoplankton.; Because of the obvious importance of P as a nutrient that often accelerates growth of phytoplankton (including toxic cyanobacteria) and therefore worsens water quality, much interest has been devoted to P exchange across the sediment-water interface. Generally, the release mode of P from the sediment differed greatly between shallow and deep lakes, and much of the effort has been focused on iron and oxygen, and also on the relevant environmental factors, for example, turbulence and decomposition, but a large part of the P variation in shallow lakes remains unexplained. This paper reviews experimental and field studies on the mechanisms of P release from the sediment in the shallow temperate (in Europe) and subtropical (in the middle and lower reaches of the Yangtze River in China) lakes, and it is suggested that pH rather than DO might be more important in driving the seasonal dynamics of internal P loading in these shallow lakes, i.e., intense photosynthesis of phytoplankton increases pH of the lake water and thus may increase pH of the surface sediment, leading to enhanced release of P (especially iron-bound P) from the sediment. Based on the selective pump of P (but not N) from the sediment by algal blooms, it is concluded that photosynthesis which is closely related to eutrophication level is the driving force for the seasonal variation of internal P loading in shallow lakes. This is a new finding. Additionally, the selective pump of P from the sediment by algal blooms not only explains satisfactorily why both TP and PO4-P in the hypereutrophic Lake Donghu declined significantly since the mid-1980s when heavy cyanobacterial blooms were eliminated by the nontraditional biomanipulation (massive stocking of the filter-feeding silver and bighead carps), but also explains why TP in European lakes decreased remarkably in the spring clear-water phase with less phytoplankton during the seasonal succession of aquatic communities or when phytoplankton biomass was decreased by traditional biomanipulation. Compared with deep lakes, wax and wane of phytoplankton due to alternations in the ecosystem structure is also able to exert significant influences on the P exchange at the sediment-water interface in shallow lakes. In other words, biological activities are also able to drive P release from sediments, and such a static P release process is especially more prominent in eutrophic shallow lakes with dense phytoplankton.
SubtypeArticle
KeywordShallow Lakes Internal p Loading Algal Blooms
DepartmentChinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Subject AreaGeosciences, Multidisciplinary
DOI10.1007/s11430-006-8102-z
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000238958400002
WOS KeywordSUBTROPICAL CHINESE LAKE ; BLUE-GREEN-ALGAE ; SEDIMENT RESUSPENSION ; HYPEREUTROPHIC LAKE ; TOP-DOWN ; RELEASE ; PHYTOPLANKTON ; DYNAMICS ; NITROGEN ; FISH
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8912
Collection期刊论文
Corresponding AuthorXie, P, Chinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
AffiliationChinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Xie Ping,Xie, P, Chinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China. Biological mechanisms driving the seasonal changes in the internal loading of phosphorus in shallow lakes[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2006,49:14-27.
APA Xie Ping,&Xie, P, Chinese Acad Sci, Inst Hydrobiol, Donghu Expt State Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.(2006).Biological mechanisms driving the seasonal changes in the internal loading of phosphorus in shallow lakes.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,49,14-27.
MLA Xie Ping,et al."Biological mechanisms driving the seasonal changes in the internal loading of phosphorus in shallow lakes".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 49(2006):14-27.
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