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Mechanistic assessment of hillslope transpiration controls of diel subsurface flow: a steady-state irrigation approach

机译：Diel地下流的坡地蒸腾控制的机械评估：稳态灌溉法

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摘要

Mechanistic assessment of how transpiration influences subsurface flow is necessary to advance understanding of catchment hydrology. We conducted a 24-day, steady-state irrigation experiment to quantify the relationships among soil moisture, transpiration and hillslope subsurface flow. Our objectives were to: (1) examine the time lag between maximum transpiration and minimum hillslope discharge with regard to soil moisture; (2) quantify the relationship between diel hillslope discharge and daily transpiration; and (3) identify the soil depth from which trees extract water for transpiration. An 8 × 20 m hillslope was irrigated at a rate of 3·6 mm h~(-1). Diel fluctuations in hillslope discharge persisted throughout the experiment. Pre-irrigation time lags between maximum transpiration and minimum hillslope discharge were 6·5 h, whereas lags during steady-state and post-irrigation conditions were 4 and 2 h, respectively. The greatest correlation between transpiration and hillslope discharge occurred during the post-irrigation period, when the diel reduction in hillslope discharge totalled 90% of total measured daily transpiration. Daily transpiration of trees within the irrigated area remained relatively constant throughout the experiment. Diel fluctuations in soil moisture were greatest at a depth of 0·9-1·2 m prior to irrigation and became more uniform throughout the soil profile during and post-irrigation. This study clearly demonstrates that when soil moisture is high, hillslope trees can be an important factor in diel fluctuations in stream discharge. We advance a conceptual model for the site whereby the relationship between transpiration and hillslope discharge is a function of soil moisture status and drainable porosity.
机译：对蒸腾作用如何影响地下流量进行机械评估，对于增进对流域水文学的认识是必要的。我们进行了为期24天的稳态灌溉实验，以量化土壤水分，蒸腾作用和山坡地下流量之间的关系。我们的目标是：（1）研究土壤水分方面最大的蒸腾量和最小的山坡排放量之间的时间差； （2）量化迪尔山坡排水与每日蒸腾量之间的关系； （3）确定树木从中提取水分进行蒸腾的土壤深度。以3×6 mm h〜（-1）的速度灌溉8×20 m的山坡。在整个实验过程中，山坡放电的Diel波动持续存在。在最大蒸腾量和最小山坡排水量之间的灌溉前时间滞后为6·5 h，而在稳态和灌溉后条件下的滞后分别为4 h和2 h。蒸腾与坡度排放之间的最大相关性发生在灌溉后时期，当时坡度排放的diel减少总计为每日测得总蒸腾量的90％。在整个实验过程中，灌溉区内树木的日蒸腾量保持相对恒定。灌溉之前，土壤水分的Diel波动最大，深度为0·9-1·2 m，并且在灌溉期间和灌溉后的整个土壤剖面中都更加均匀。这项研究清楚地表明，当土壤湿度高时，坡坡树可能是溪流排放中diel波动的重要因素。我们提出了该地点的概念模型，其中蒸腾作用和山坡排水之间的关系是土壤水分状况和可排水孔隙度的函数。

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  • 来源
    《Ecohydrology》 |2010年第2期|P.133-142|共10页
  • 作者

    H. R. Barnard; C. B. Graham; W. J. Van Verseveld; J. R. Brooks; B. J. Bond; J. J. McDonnell;

  • 作者单位

    Oregon State University, College of Forestry, Corvallis, OR 97331, USA University of Colorado Institute of Arctic and Alpine Research, Department of Geography, Boulder, CO 80309-0450, USA;

    Oregon State University, College of Forestry, Corvallis, OR 97331, USA;

    Oregon State University, College of Forestry, Corvallis, OR 97331, USA;

    United States Environmental Protection Agency, Western Ecology Division, Corvallis, OR 97333, USA;

    Oregon State University, College of Forestry, Corvallis, OR 97331, USA;

    Oregon State University, College of Forestry, Corvallis, OR 97331, USA;

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  • 正文语种 eng
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  • 关键词

    transpiration; hillslope hydrology; diel discharge; soil moisture; Douglas-fir; ecohydrology;

    机译：蒸腾作用山坡水文diel放电土壤湿度;花旗松;生态水文学;

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