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首页> 外文期刊>Soil Science Society of America Journal >Spatial Relationships of Phosphorus Sorption in a Seasonally Saturated Constructed Wetland Soil
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Spatial Relationships of Phosphorus Sorption in a Seasonally Saturated Constructed Wetland Soil

机译：季节性饱和人工湿地土壤磷素吸附的空间关系

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Constructed wetlands can be important sinks of P in agricultural landscapes; however, the long-term ability of these systems to retain P often diminishes with time. This study used a spatially explicit statistical approach to characterize spatial patterns of soil properties and their correlation with P sorption in an 11-yr-old, seasonally saturated, constructed wetland receiving runoff from irrigated agriculture. The results were used to link the spatial pattern of P sorption with hydrologic, biogeochemical, and pedologic processes. A spatial sampling design was used and soil samples were measured for total P, bioavailable P, P sorption index (PSI), total C and N, texture, oxalate- and dithionite-extractable Fe and Mn, pH, electrical conductivity, water-extractable Mg, Ca, and Na, and sedimentation rate. Wetland hydrodynamics was a primary factor shaping the spatial distribution of wetland soil properties, creating three distinct hydrologic and biogeochemical zones (e.g., sediment deposition, transition, and Fe oxide transformation). Soil properties with the strongest correlation to the PSI included oxalate-extractable Fe, clay, total C, and silt. In the sediment-deposition zone, sedimentation was the dominant process influencing P sorption, contributing fresh sediments with reactive surfaces for P sorption. In contrast, the Fe oxide transformation zone received little sedimentation, resulting in greater exposure time for surface sediment alteration. Increased exposure resulted in dissolution of crystalline Fe oxides and reformation of poorly crystalline Fe oxides in a thin oxidative lens at the sediment–water column interface, thus increasing P sorption capacity. This spatially explicit investigation of P sorption in seasonally saturated wetland soils provided a robust framework within which to evaluate the wetland soil processes controlling P sorption capacity and the efficacy for long-term sorption potential.
机译：人工湿地可能是农业 景观中重要的磷汇。但是，这些系统 保留P的长期能力通常会随着时间而降低。这项研究使用空间显式统计方法来表征11岁的土壤性质的空间格局 及其与P吸附的相关性，季节性饱和的人工湿地从灌溉农业中获得 径流。结果用于 将磷吸附的空间模式与水文，生物地球化学， 和生态学过程联系起来。使用空间采样设计 ，并测量土壤样品中的总磷，生物有效性磷， P吸附指数（PSI），总碳和氮，质地，草酸盐和<可以通过连二亚硫酸盐萃取的铁和锰，pH，电导率， 可水萃取的Mg，Ca和Na以及沉降速率。湿地 水动力是影响湿地土壤特性空间分布的主要因素，产生了三个不同的水文和生物地球化学区（例如，沉积物沉积，过渡带）。 ， 和氧化铁转变）。与PSI相关性最强的土壤性质包括草酸盐可萃取的铁，粘土，总碳和淤泥。在沉积物沉积区，沉积物 是影响P吸附的主要过程，贡献了 具有反应性表面P吸附的新鲜沉积物。相比之下， Fe氧化物转变带几乎没有沉积， 导致表面沉积物改变的暴露时间更长。 暴露增加导致结晶溶解。 Fe 氧化物和沉积物-水柱界面处 薄氧化膜中晶态较弱的Fe氧化物的重整，从而提高了P的吸附能力。季节性的湿地土壤中P吸附的空间显式 研究提供了一个可靠的框架，可以用来评估控制土壤P吸附能力和控制湿地土壤湿地过程的 。 对长期吸附潜力的功效。

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  • 来源
    《Soil Science Society of America Journal》 |2009年第5期|1741-1753|共13页
  • 作者

    Jonathan J. Maynard; Anthony T. OGeen; Randy A. Dahlgren;

  • 作者单位

    Dep. of Land, Air and Water Resources, Univ. of California, One Shields Ave., Davis, CA 95618-8627;

    Dep. of Land, Air and Water Resources, Univ. of California, One Shields Ave., Davis, CA 95618-8627;

    Dep. of Land, Air and Water Resources, Univ. of California, One Shields Ave., Davis, CA 95618-8627;

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