Phosphorus release from the drying and reflooding of diverse shallow sediments

被引:1
作者
Lauren E. Kinsman-Costello
Stephen K. Hamilton
Jonathan M. O’Brien
Jay T. Lennon
机构
[1] W.K. Kellogg Biological Station,Department of Biological Sciences
[2] Michigan State University,Department of Biology
[3] Kent State University,Department of Biology
[4] Canisius College,undefined
[5] Indiana University,undefined
来源
Biogeochemistry | 2016年 / 130卷
关键词
Water level fluctuations; Wetland restoration; Sediment; Soil; Phosphorus; Iron;
D O I
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中图分类号
学科分类号
摘要
Phosphorus (P) retention is an important ecosystem service provided by sediments and soils. However, when shallow aquatic sediments and poorly drained soils dry and re-flood, they can be a source, rather than a sink, of P. Using experimental drying and re-flooding in the laboratory, we assessed the resultant sediment–water P exchange in a biogeochemically diverse set of sediments from 16 sites in Michigan. The direction and magnitude of P exchange to pore waters and surface waters upon re-flooding varied among sediments. Different sediment properties were related to P release to pore water than to P release to overlying surface water, suggesting that different processes control two phases of sediment P release: mobilization from solid to dissolved forms in the sediment pore water; and movement of dissolved P from pore water into overlying surface water. We observed especially high P release in dried and re-flooded sediments with high amounts of loosely sorbed phosphate, suggesting that drained sediments with a legacy of high P loads will be most likely to release P and experience internal eutrophication when re-flooded. The differential responses of sediments suggest that aquatic ecosystem restoration and management for nutrient removal must be evaluated with site-specific knowledge of sediment and soil biogeochemistry.
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页码:159 / 176
页数:17
相关论文
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