Reconceptualizing the hyporheic zone for nonperennial rivers and streams
Reconceptualizing the hyporheic zone for nonperennial rivers and streams
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DOI：
10.1086/720071
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发表时间：
2022-06-01
影响因子：
1.8
通讯作者：
Allen, Daniel C.
中科院分区：
文献类型：
--
作者：
DelVecchia, Amanda G.;Shanafield, Margaret;Allen, Daniel C.
非常年河流在全球河流网络中占主导地位，在空间和时间上都在增加。当地表水流停止或地表水变干时，水流或水分可以保留在潜流带的地下沉积物中，支持水生群落和生态系统过程。然而，在常年性河流中，已经制定了潜流带的水文和生态定义，并强调地表水和地下水的水和生物的混合。适应这样的定义，包括潮湿和干燥的不饱和条件下，可以促进水文和地球化学的变化如何塑造生态群落的非常年性hyporheic区的特点，推进我们的理解，在这些栖息地的生态系统结构和功能。为了概念化非常年流的潜流区，我们回顾了水源和地表及地下结构如何影响水文和物理化学条件。我们认为，这一区域的范围和地球化学和生态如何可能与表面状态的变化。然后，我们将这些组件的组成nonpermanent流社区。接下来，我们研究文献，以确定优先考虑的水文和生态研究探索非常年性潜流区。最后，通过整合水文学，地球化学和生态学，我们建议一个多学科的概念化的nonpermanent hyporheic区的多孔地下河床沉积物之间的lotic，lentic，潮湿，干燥的条件下，在空间和时间，以支持水生-陆生生物多样性。由于全球变化，河流干涸的程度增加，我们呼吁在陆地和水生科学的整体，跨学科的研究，应用这种概念化来表征整个水文状态的全方位的潜流区结构和功能。
Nonperennial streams dominate global river networks and are increasing in occurrence across space and time. When surface flow ceases or the surface water dries, flow or moisture can be retained in the subsurface sediments of the hyporheic zone, supporting aquatic communities and ecosystem processes. However, hydrological and ecological definitions of the hyporheic zone have been developed in perennial rivers and emphasize the mixing of water and organisms from both the surface stream and groundwater. The adaptation of such definitions to include both humid and dry unsaturated conditions could promote characterization of how hydrological and biogeochemical variability shape ecological communities within nonperennial hyporheic zones, advancing our understanding of both ecosystem structure and function in these habitats. To conceptualize hyporheic zones for nonperennial streams, we review how water sources and surface and subsurface structure influence hydrological and physicochemical conditions. We consider the extent of this zone and how biogeochemistry and ecology might vary with surface states. We then link these components to the composition of nonperennial stream communities. Next, we examine literature to identify priorities for hydrological and ecological research exploring nonperennial hyporheic zones. Lastly, by integrating hydrology, biogeochemistry, and ecology, we recommend a multidisciplinary conceptualization of the nonperennial hyporheic zone as the porous subsurface streambed sediments that shift between lotic, lentic, humid, and dry conditions in space and time to support aquatic-terrestrial biodiversity. As river drying increases in extent because of global change, we call for holistic, interdisciplinary research across the terrestrial and aquatic sciences to apply this conceptualization to characterize hyporheic zone structure and function across the full spectrum of hydrological states.