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首页> 外文期刊>Soil Science Society of America Journal >Microbial Indicators of Eutrophication in Everglades Wetlands
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Microbial Indicators of Eutrophication in Everglades Wetlands

机译：大沼泽地湿地富营养化的微生物指标

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Nutrient loading has been implicated as a major cause of ecological changes in Everglades wetlands. The main objective of this study was to assess changes in microbial indicators in response to nutrient loading across the Everglades landscape. Soil chemical, physical, and microbial properties were measured for nutrient-impacted and oligotrophic sites within Water Conservation Area (WCA)-1, WCA-2a, WCA-3a, and Taylor Slough of Everglades National Park. Impacts of nutrient loading were most evident by the development of gradients in floc and soil total P from peripheral to interior areas of all wetlands following the paths of surface water flow. Floc was more responsive to nutrient loading than the underlying soil. The sensitive indicators of eutrophication were floc and soil total P, microbial biomass P, and mineralized P. Total P averaged 185 and 140% greater for nutrient-impacted than oligotrophic areas for floc and soil (0–3 cm), respectively. Microbial biomass P averaged 97 and 52% higher at nutrient-impacted than oligotrophic areas for floc and soil, respectively. Mineralized P was the most sensitive indicator of eutrophication, being 689 and 135% higher at nutrient-impacted than oligotrophic areas for floc and soil, respectively. Microbial indicators in WCA-3a and Taylor Slough were more responsive to nutrient loading than in WCA-1 and WCA-2a, which received higher P loads. Delineation of nutrient-impacted and oligotrophic areas in Everglades wetlands may serve as a baseline to assess future impacts of eutrophication. The consistent pattern in the response of microbial processes to nutrient loading across the range of conditions in different Everglades wetlands demonstrates their suitability as sensitive indicators of eutrophication.
机译：营养负荷被认为是大沼泽地湿地生态变化的主要原因。这项研究的主要目的是评估大沼泽地景观中微生物对养分负荷的响应。测量了水源保护区（WCA）-1， WCA--中受养分影响的 和贫营养位的土壤化学， 和微生物特性图2a，WCA-3a和大沼泽国家公园的泰勒·斯劳。 对絮凝物和土壤总磷从外围到内部的梯度的发展 最明显沿地表水流路径的所有湿地的 区域。 絮凝物对营养负荷的响应比其下层的 土壤更敏感。富营养化的敏感指标是絮凝物和 土壤总磷，微生物生物量P和矿化P。养分受影响的总 P平均比贫营养的 分别用于絮凝物和土壤（0–3厘米）的区域。受絮凝物影响的微生物 生物质磷平均水平比 高营养区域高97％和52％。矿化的 P是富营养化的最敏感指标，在营养影响下，絮凝物和土壤的 689分别比贫营养区 高135％。 。 WCA-3a 和Taylor Slough中的微生物指标对养分负荷的响应要比WCA-1和WCA-2a中的 更高，后者的P负荷更高。在大沼泽地湿地中受营养影响和贫营养区的描述 可以作为评估富营养化未来影响的基线。 响应中的一致模式 在不同条件下的微生物过程对营养物负荷的研究表明，Everglades湿地适合作为富营养化的敏感指标。 上>

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  • 来源
    《Soil Science Society of America Journal》 |2009年第5期|1597-1603|共7页
  • 作者

    Alan L. Wright; K. Ramesh Reddy; Susan Newman;

  • 作者单位

    Everglades Research & Education Center, Univ. of Florida, 3200 E. Palm Beach Rd., Belle Glade, FL 33430,South Florida Water Management District, 3301 Gun Club Rd., West Palm Beach, FL 33406;

    Wetland Biogeochemistry Lab., Soil and Water Science Dep., Univ. of Florida, Gainesville, FL 32603,South Florida Water Management District, 3301 Gun Club Rd., West Palm Beach, FL 33406;

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