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Monitoring wetlands in a salinizing landscape: case studies from the Wheatbelt region of Western Australia

机译：在盐渍化景观中监测湿地：西澳大利亚州小麦带地区的案例研究

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摘要

Three elements of wetland biodiversity (aquatic invertebrates, waterbirds and overstorey vegetation of the wetland edge) have been monitored since 1998 at Lake Eganu and Paperbark Swamp in the Western Australian Wheatbelt to provide information about the changes occurring in wetland biodiversity in a landscape that is severely affected by dryland salinization. Changes in extent of wetland vegetation since the 1960s were examined using historical aerial photographs and waterbird use of Lake Eganu during the early 1980s was compared with recent waterbird survey results. Lake Eganu, which is within a major drainage line, started to become salinized in the mid-1960s, about 70 years after land clearing began in the catchment, and its salinity has increased an order of magnitude. The extent of wetland overstorey vegetation and the richness of freshwater aquatic invertebrates have both declined about 80%. Waterbird richness has also declined over the past 20 years, with changes in species composition. Salinization has not occurred at Paperbark Swamp, which is in a small catchment off the main drainage line, and there has been no consistent change in the biodiversity elements monitored.
机译：自1998年以来，在西澳大利亚小麦带的Eganu湖和Paperbark沼泽对湿地生物多样性的三个要素（水生无脊椎动物，水鸟和过高的植被）进行了监测，以提供有关严重景观中湿地生物多样性发生变化的信息。受旱地盐碱化影响。使用历史航空照片检查了1960年代以来湿地植被的变化，并将1980年代初对Eganu湖的水鸟使用与最近的水鸟调查结果进行了比较。在主要排水线内的埃加努湖于1960年代中期开始被盐化，这是在流域开始清理土地约70年之后，其盐度增加了一个数量级。湿地超植被的程度和淡水水生无脊椎动物的丰富度都下降了约80％。随着物种组成的变化，水鸟的丰富度在过去20年中也有所下降。在位于主要排水管道旁一个小流域的Paperbark沼泽没有发生盐碱化，所监测的生物多样性要素也没有持续变化。

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