Soil water and temperature patterns in an arid desert dune sand
Soil water and temperature patterns in an arid desert dune sand
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DOI：
10.1016/0022-1694(95)02987-7
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发表时间：
1996-11-01
影响因子：
6.4
通讯作者：
Jinno, K
中科院分区：
文献类型：
--
作者：
Berndtsson, R;Nodomi, K;Jinno, K
在干旱的自然条件下，土壤含水量控制和限制多年生植物物种的数量和大小。因此，植物可利用的土壤水分是可持续控制沙漠侵蚀的主要制约因素。为了评估裸露沙地植被恢复的可能性，对沙漠气候条件下典型沙丘的土壤水、温分布进行了研究。选择裸露和植被覆盖的土壤样带进行土壤水分和温度的观测。调查的土壤断面覆盖了顶部到顶部的间距（约60米水平和15米垂直）在流动沙丘区。观测是在中国西北部腾格里沙漠接壤的沙坡头野外研究站进行的。本文给出了降雨前后土壤含水量（0.1-3.0 m深度）和温度（0-1.0 m深度）的二维特征。降雨量（15-22 mm）影响1.5-2.0 m土层内的土壤水分分布和1.0 m土层内的温度分布。土壤水似乎是通过明显的高渗透性和均匀的砂沿着沙丘斜坡。高含水量，因此，渗透主要发生在非斜坡部分，即沙丘的顶部和底部。降雨改变了温度模式，从一个主要的水平分层外观降雨前越来越垂直形状的图案。
Under arid natural conditions, soil water content governs and limits the number and size of perennial plant species. Thus, plant-available soil water is the main constraint for sustainable control of desert encroachment. To evaluate possibilities for re-vegetation of bare sand surfaces, soil water and temperature patterns for typical sand dunes in a desert climate were investigated. Bare and vegetated soil transects were selected for observation of soil water content and temperature. The investigated soil transects covered crest-to-crest spacings (about 60 m horizontally and 15 m vertically) in a shifting sand dune area. Observations were made at Shapotou field research station bordering the Tengger Desert in Northwestern China. The paper presents two-dimensional properties of soil water content (0.1-3.0 m depth) and temperature (0-1.0 m depth) before and after rainfall. Rainfall (15-22 mm) affected soil water distribution down to 1.5-2.0 m and temperature distribution down to 1.0 m. Soil water appeared to be transported through the apparently highly pervious and homogeneous sand along the dune slopes. High water contents and, thus, infiltration occurred mainly at the non-sloping parts, i.e. the dune crests and bottoms. Rainfall changed the temperature patterns from a mainly horizontally layered appearance before the rainfall to increasingly vertically shaped patterns.