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首页> 外文期刊>The Science of the Total Environment >Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems
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Alteration in isotopic composition of gross rainfall as it is being partitioned into throughfall and stemflow by xerophytic shrub canopies within water-limited arid desert ecosystems

机译：缺水干旱沙漠生态系统中的旱生灌木冠层将降雨分成总降雨和茎流，从而改变总降雨的同位素组成

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摘要

Isotopic composition of gross rainfall has been extensively used as a conservative tracer to track water movement and other hydrological processes in vegetated ecosystems. Recent studies from forest ecosystems, however, demonstrated that vegetation canopies can alter the isotopic composition of rainwater during rainfall partitioning into throughfall and stemflow, likely leading to errors and biases in aforementioned studies. No known studies, to date, had investigated this topic in shrub-dominated arid and semi-arid ecosystems where water is typically the driving factor in ecological, hydrological and biogeochemical processes. In this study, event-based gross rainfall, the throughfall and stemflow induced by shrubs of Caragana korshinskii were measured and samples were collected within a water-limited arid desert ecosystem of northern China, and their water stable isotopes (O-18 and H-2) were also analyzed in the laboratory. We mainly aimed to investigate whether there is an isotopic enrichment or depletion in stemflow and throughfall in comparison to gross rainfall, and to evaluate the possible underlying mechanisms. Our results indicated an enrichment of both isotopes in stemflow, while a general more depletion in throughfall than in gross rainfall, which is presumably affected by a combinative effects of canopy evaporation, isotopic exchange, and selective canopy storage. Deuterium excess of stemflow were found to be significantly higher (P< 0.05) than that of gross rainfall and throughfall. Moreover, we detected the pronounced "amount effect", with a significant (P< 0.05) negative relationship between isotopic composition and the amount of gross rainfall, throughfall, and stemflow, respectively. Our study is expected to contribute to an improved understanding of physical processes and water routing in shrub canopies within vast arid desert ecosystems. (C) 2019 Elsevier B.V. All rights reserved.
机译：总降雨量的同位素组成已被广泛用作保守的示踪剂，以追踪植被生态系统中的水运动和其他水文过程。然而，来自森林生态系统的最新研究表明，植被冠层可以在降雨分配为降雨流和茎流的过程中改变雨水的同位素组成，这很可能导致上述研究的错误和偏差。迄今为止，尚无已知研究在灌木为主的干旱和半干旱生态系统中研究该主题，在这些生态系统中，水通常是生态，水文和生物地球化学过程的驱动因素。在这项研究中，测量了基于事件的总降水量，柠条锦鸡儿灌木引起的贯穿流和茎流，并在中国北方缺水干旱的沙漠生态系统中收集了样本，以及它们的水稳定同位素（O-18和H- 2）也在实验室进行了分析。我们的主要目的是调查与总降雨量相比，茎流和贯通流中是否存在同位素富集或枯竭，并评估可能的潜在机理。我们的结果表明茎流中两种同位素的富集，通流中的消耗通常比总降雨中的消耗更多，这大概受冠层蒸发，同位素交换和选择性冠层存储的综合影响。发现氘的茎流过量显着高于总降雨量和贯通量（P <0.05）。此外，我们检测到明显的“量效应”，同位素组成与总降雨量，穿透量和茎流量之间均具有显着（P <0.05）负相关关系。预期我们的研究将有助于增进对广阔干旱沙漠生态系统中灌木冠层的物理过程和水流路径的了解。 （C）2019 Elsevier B.V.保留所有权利。

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