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首页> 外文期刊>Restoration ecology >A 16-year investigation of legacy phosphorus discharge from Prairie Wolf Slough: a wetland restored on a former farmed field
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A 16-year investigation of legacy phosphorus discharge from Prairie Wolf Slough: a wetland restored on a former farmed field

机译：从草原狼泥泞的遗产磷排放的16年调查：在一个前农业领域恢复了湿地

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Phosphorus (P) release to surface and groundwater often occurs in wetlands that were restored on former agricultural fields. We identified pore water, shallow groundwater, and plant biomass decomposition as sources of soluble reactive (SRP) and total phosphorus (TP) export to the Chicago River between 1998 and 2014 from Prairie Wolf Slough Wetland Demonstration Project (PWS), a wetland restored on a former farmed field in suburban Chicago, Illinois. We estimated the relative annual contributions of SRP from these sources to yearly discharge to the river and conducted an SRP mass balance. SRP and TP concentrations and loadings were consistently greater at the outlet compared to the inlet, suggesting PWS was a source of P. Twenty-three grams of SRP was exported during the mass balance study. SRP concentration at the inlet accounted for less than 3% of the SRP exported annually at the outlet to the Chicago River. Plant biomass decomposition, pore water diffusion, and groundwater seepage together accounted for 85% of annual export. Twelve percent of annual SRP export remains unknown. PWS was ineffective in reducing P export, indicating an ecosystem disservice. Our study highlights the need to identify the sources of P exported from wetlands restored on farm fields to better understand the biogeochemical processes that determine whether a wetland will serve as a source or sink of P. Pre-restoration measurement, followed by decadal-scale post-restoration monitoring, of source-water and soil P are needed to evaluate the success of wetland restorations designed to sequester P from runoff.
机译：表面和地下水的磷（P）释放通常发生在以前的农业领域恢复的湿地中。我们将孔隙水，浅层地下水和植物生物量分解为可溶性反应（SRP）和总磷（TP）出口到1998年至2014年的芝加哥河，从大草原狼泥湿地示范项目（PWS），湿地恢复了一个前养殖的领域在伊利诺伊州芝加哥郊区。我们估计，SRP从这些来源到河流年卸货的相对年度贡献，并进行了SRP大规模余额。与入口相比，出口时，SRP和TP浓度和载荷始终如一，表明PWS是P.在大规模余额研究期间出口二十三克SRP的源。入口的SRP浓度占SRP每年在芝加哥河的出口出口的3％。植物生物质分解，孔隙水分扩散和地下水渗在一起占年出口的85％。每年的SRP出口占未知数十倍。在减少P导出方面，PWS无效，指示生态系统陷阱。我们的研究突出了识别从农场领域恢复的湿地出口的P的需要的必要性，以更好地了解确定湿地是否将作为P.预恢复测量的源或水槽的生物地球化学过程，其次是二等级柱子 - 需要源水和土壤P需要进行监测，以评估湿地修复的成功，旨在从径流中隔离P.

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