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首页> 外文期刊>Soil and Water Research >Soil water response to rainfall in a dune-interdune landscape in Horqin Sand Land, northern China
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Soil water response to rainfall in a dune-interdune landscape in Horqin Sand Land, northern China

机译：中国北方科尔沁沙地沙丘-跨界景观中土壤水分对降雨的响应

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摘要

Soil water dynamic is considered an important process for water resource and plantation management in Horqin Sand Land, northern China. In this study, soil water content simulated by the SWMS-2D model was used to systematically analyse soil water dynamics and explore the relationship between soil water and rainfall among micro-landforms (i.e., top, upslope, midslope, toeslope, and bottomland) and 0–200 cm soil depths during the growing season of 2013 and 2015. The results showed that soil water dynamics in 0–20 cm depths were closely linked to rainfall patterns, whereas soil water content in 20–80 cm depths illustrated a slight decline in addition to fluctuations caused by rainfall. At the top position, the soil water content in different ranges of depths (20–40 and 80–200 cm) was near the wilting point, and hence some branches, and even entire plants exhibited diebacks. At the upslope or midslope positions, the soil water content in 20–80?or 80–200?cm depths was higher than at the top position. Soil water content was higher at the toeslope and bottomland positions than at other micro-landforms, and deep caliche layers had a positive feedback effect on shrub establishment. Soil water recharge by rainfall was closely related to rainfall intensity and micro-landforms. Only rainfalls 20 mm significantly increased water content in 40 cm soil depths, but deeper water recharge occurred at the toeslope position. A linear equation was fitted to the relationship between soil water and antecedent rainfall, and the slopes and R sup 2 /sup of the equations were different among micro-landforms and soil depths. The linear equations generally fitted well in 0–20?and 20–40 cm depths at the top, upslope, midslope, and toeslope positions ( R sup 2 /sup value of about 0.60), with soil water in 0–20 cm depths showing greater responses to rainfall (average slope of 0.189). In 20–40 cm depths, the response was larger at the toeslope position, with a slope of 0.137. In 40–80 cm depths, a good linear fit with a slope of 0.041 was only recorded at the toeslope position. This study provides a soil water basis for ecological restoration in similar regions.
机译：土壤水分动态被认为是中国北方科尔沁沙地水资源和人工林管理的重要过程。在这项研究中，使用SWMS-2D模型模拟的土壤含水量来系统地分析土壤水分动力学，并探索土壤水分与降雨在微地形（如顶部，上坡，中坡，趾坡和底坡）之间的关系。 2013年和2015年生长季节的土壤深度为0–200 cm。结果表明，0–20 cm深度的土壤水分动力学与降雨模式密切相关，而20–80 cm深度的土壤水分含量表明土壤水分动态下降除了降雨引起的波动。在最高位置，不同深度范围（20–40和80–200 cm）中的土壤水分接近枯萎点，因此有些分支甚至整个植物都表现出枯萎。在上坡或中坡位置，在20–80？或80–200？cm深度处的土壤含水量高于顶部位置。坡地和低地位置的土壤水分含量高于其他微地形，并且深层的古积水层对灌木的形成具有积极的反馈作用。降雨对土壤水分的补给与降雨强度和微地形密切相关。只有> 20 mm的降雨量才能在> 40 cm的土壤深度中显着增加含水量，但在坡度位置会出现更深的补给水。线性方程拟合了土壤水分与前期降雨之间的关系，在微地形和土壤深度之间，方程的斜率和R 2 不同。线性方程通常在顶部，上坡，中坡和坡度位置（R 2 值约为0.60）的0–20？和20–40 cm深度处拟合得很好（土壤水在0– 20厘米深显示出对降雨的更大响应（平均斜率为0.189）。在20–40 cm的深度中，在前坡位置的响应较大，斜率为0.137。在40–80 cm的深度中，仅在前坡位置记录了良好的线性拟合，其斜率为0.041。该研究为相似地区的生态恢复提供了土壤水基础。

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