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Eco-hydrological requirements of dune slack vegetation and the implications of climate change

机译：沙丘松弛植被的生态水文要求及其对气候变化的影响

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摘要

Dune slacks are a seasonal coastal wetland habitat, whose plant assemblages and soil properties are strongly linked to a fluctuating water table. Climate change is predicted to cause major shifts in sand dune hydrological regimes, yet we know remarkably little about the tolerance of these communities to change, and their precise hydrological requirements are poorly quantified. Dune slack vegetation and soils were sampled within five vegetation types across four west coast UK sites. Relationships between vegetation assemblages, and parameters of soil development (moisture, loss on ignition, pH, KG extractable ions) and groundwater hydrological regime (annual maximum and minimum water levels and range, duration of flooding) were established to define the environmental tolerances of different communities. In multivariate analysis of the vegetation, the dominant gradient was hydrological: dry to wet, followed by a secondary soil development gradient: young calcareous organic-poor soils to acidiceutral soils with greater organic matter contents. Most measured hydrological and soil variables explained a significant proportion of observed variation in species composition when tested individually, with the exception of soil nitrate and soil calcium concentrations. Maximum water level was the key hydrological variable, and soil moisture and soil pH were the key soil variables. All hydrological and soil parameters together explained 22.5% of the total species variation. There were significant differences in hydrological and soil parameters between community types, with only 40 cm difference in mean annual minimum water levels (averaged over 4 years) separating the wettest and the driest dune slack communities. Therefore, predicted declines in water level exceeding 100 cm by 2080 are likely to have a major impact on the vegetation of these priority conservation habitats.
机译：沙丘松弛地区是季节性的沿海湿地栖息地，其植物群落和土壤特性与地下水位的波动密切相关。预计气候变化将导致沙丘水文状况发生重大变化，但我们对这些社区对变化的容忍度知之甚少，而其精确的水文要求也难以量化。在英国四个西海岸站点的五种植被类型中，对沙丘松弛的植被和土壤进行了采样。建立了植被组合与土壤发育参数（水分，灼烧损失，pH，KG可提取离子）和地下水水文状况（年度最大和最小水位和范围，洪水持续时间）之间的关系，以定义不同环境的耐受性社区。在植被的多变量分析中，主要梯度是水文：从干到湿，然后是次生土壤发育梯度：年轻的钙质有机质较差的土壤到有机质含量较高的酸性/中性土壤。除土壤硝酸盐和土壤钙浓度外，大多数单独测量的水文和土壤变量解释了观察到的物种组成变化的很大一部分。最大水位是关键的水文变量，而土壤湿度和pH是关键的土壤变量。所有水文和土壤参数共同解释了总物种变化的22.5％。不同群落类型之间的水文和土壤参数存在显着差异，将最湿的沙丘和最干燥的沙丘松散群落分开的年平均最低水位（平均4年）仅相差40 cm。因此，预计到2080年水位下降超过100厘米可能会对这些优先保护生境的植被产生重大影响。

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  • 来源
    《Science of the total environment》 |2013年第15期|910-919|共10页
  • 作者

    A. Curreli; H. Wallace; C. Freeman; M. Hollingham; C. Stratford; H. Johnson; L. Jones;

  • 作者单位

    School of Biological Sciences, Bangor University, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;

    Ecological Surveys (Bangor), The School House, Canon Pyon, Herefordshire HR4 8PF, UK;

    School of Biological Sciences, Bangor University, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;

    Martin Hollingham Hydrological Services, Ty Newydd, Church St. Newborough, Anglesey LL61 6SD, UK;

    Centre for Ecology & Hydrology, Maclean Building, Wallingford, Oxfordshire 0X10 8BB, UK;

    Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, Gwynedd LL57 2UW, UK;

    Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, Gwynedd LL57 2UW, UK;

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  • 正文语种 eng
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  • 关键词

    hydroecology; sand dunes; groundwater; global change; water table;

    机译：水生态学沙丘地下水;全球变化;地下水位;

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