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首页> 外文期刊>Aquatic Sciences >Ecological significance of hydrological connectivity for wetland plant communities on a dryland floodplain river, MacIntyre River, Australia
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Ecological significance of hydrological connectivity for wetland plant communities on a dryland floodplain river, MacIntyre River, Australia

机译：澳大利亚麦金太尔河干旱平原河上的湿地植物群落水文连通性的生态意义

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摘要

Hydrological connections between river channels and their adjacent floodplains facilitate the flux of organisms and nutrients and access to increased habitat and new resources. Hydrological connections also deliver water subsidy and potentially disturb (through hydraulic forces) floodplain ecosystems. This study investigates the role of hydrological connectivity as a driver of patterns in wetland plant assemblages in billabongs on the floodplain of an Australian dryland river, exploring indirectly the relative importance of the mechanisms of flux, subsidy and disturbance. Wetland plants were surveyed in billabongs across gradients of hydrological connectivity and depth. Surveys were accompanied by experiments examining germination from the soil seed banks of each site under submerged and waterlogged conditions. The patterns in extant and germinant plant communities in relation to connectivity and depth gradients were used to infer the relative importance of the connectivity-related mechanisms of flux, subsidy and hydraulic disturbance in structuring wetland plant communities. Depth influenced both extant and germinating plant communities. Shallow billabongs supported a greater diversity and abundance of plants, and greater numbers and diversity of germinable seeds in the seed bank. Germination of seeds was greater in waterlogged soils than submerged soils. Thus, the main controls of plant abundance in wetlands appear to be availability of waterlogged soil habitat for germination and absence of light limitation for growth. Hydrological connectivity did not influence the abundance of plants or germinable seeds, but did influence species presence-absence in growing vegetation; this effect did not extend to the germinating community. Thus, hydrological connection does not appear to influence wetland vegetation by facilitating the movement of propagules between habitats. Instead, the patterns observed are consistent with hydrological connection providing a cue for germination through the delivery of water, and by modifying hydraulic habitat.
机译：河道及其附近的洪泛区之间的水文联系促进了生物体和养分的流动，并获得了更多的栖息地和新资源。水文联系还提供水补贴，并可能（通过水力）干扰洪泛区生态系统。这项研究调查了水文连通性在澳大利亚旱地河泛滥平原上的Billabongs中作为湿地植物群落模式驱动因素的作用，间接探讨了通量，补贴和干扰机制的相对重要性。在水文连通性和深度的梯度中，对Billabongs中的湿地植物进行了调查。伴随调查的是调查在淹没和淹水条件下每个站点的土壤种子库中发芽的实验。现存和发芽植物群落中与连通性和深度梯度有关的模式被用来推断通量，补贴和水力干扰的连通性相关机制在构建湿地植物群落中的相对重要性。深度影响了现存和发芽的植物群落。浅比拉邦支持种子植物中更大的多样性和丰富度，以及种子库中更多的可萌芽种子。淹水土壤中种子的发芽大于淹水土壤中的发芽。因此，湿地植物丰度的主要控制因素似乎是浸水的土壤生境可用于发芽，并且对生长没有光的限制。水文连通性不会影响植物或可萌芽种子的丰度，但会影响正在生长的植被中物种的缺乏。这种影响并没有扩展到发芽社区。因此，水文联系似乎没有通过促进生境之间繁殖体的移动来影响湿地植被。取而代之的是，观察到的模式与水文联系相一致，从而通过输水和改变水生生境为发芽提供了线索。

著录项

  • 来源
    《Aquatic Sciences》 |2016年第1期|139-158|共20页
  • 作者

    Reid M. A.; Reid M. C.; Thoms M. C.;

  • 作者单位

    Univ New England, Sch Behav Cognit & Social Sci, Riverine Landscapes Res Lab Geog & Planning, Armidale, NSW 2351, Australia;

    Univ New England, Sch Behav Cognit & Social Sci, Riverine Landscapes Res Lab Geog & Planning, Armidale, NSW 2351, Australia;

    Univ New England, Sch Behav Cognit & Social Sci, Riverine Landscapes Res Lab Geog & Planning, Armidale, NSW 2351, Australia;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrology; Higher plants; Floodplains; Dispersal; Community;

    机译：水文;高等植物;洪泛区;分散;社区;

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