黑河中游荒漠绿洲过渡带固沙植被根区土壤含水量

doi:10.7522/j.issn.1000-694X.2019.00057

摘要/Abstract

摘要： 土壤水分在很大程度上决定着荒漠固沙植被的生长状况和分布格局，不同植被对土壤水分的需求也不相同，研究植被根区土壤含水量的分布特征，可为合理调控固沙植被空间分布格局提供理论依据。以黑河中游荒漠绿洲过渡带上的固沙植被泡泡刺（Nitraria sphaerocarp）、沙拐枣（Calligonum mongolicum）为对象，于2014—2018年每年5月上旬（雨季前）和10月中旬（雨季后）钻取植被根区不同深度的土壤样品，研究不同植被根区垂直方向和水平方向上土壤含水量的分布特征及其变异性。结果表明：（1）土层越深，固沙植被根区土壤含水量越高；（2）除2017年外，其余年份两种固沙植被根区的土壤含水量均是雨季后大于雨季前；（3）水平方向上距离植被根区越远，土壤含水量越高；（4）两种植被根区土壤含水量的变异性在垂直方向上浅层大于深层，且垂直方向的变异性大于水平方向。

关键词: 土壤含水量, 变异系数, 标准差, 泡泡刺(Nitraria sphaerocarp), 沙拐枣(Calligonum mongolicum)

Abstract: Soil moisture largely determines the growth status and distribution pattern of desert sand-fixing vegetation. Different vegetation has different demands on soil moisture. The study on the distribution characteristics of soil water content in root areas of different vegetation can provide theoretical basis for rational regulation of sand-fixing vegetation distribution pattern. The Nitraria sphaerocarpa and Calligonum mongolicum in desert-oasis ecotone in the middle reaches of the Heihe River are studied in the first half of May (before the rainy season) and the middle of October (after the rainy season) in 2014-2018. Soil samples with different depths in the root zone of the vegetation were drilled to study the distribution characteristics and variability of soil water content in the vertical and horizontal directions of different vegetation root zones. The result showed that:(1) The deeper the soil layer, the higher the soil moisture content in the root zone of sand-fixing vegetation; (2) Except for 2017, the soil moisture content in the root area of the two sand-fixation vegetation types in other years was greater after the rainy season than before the rainy season. (3) The farther away from vegetation root zone in horizontal direction, the greater soil moisture content. (4) The variability of soil water content in superficial layer is more higher than the deep layer in the vertical direction, and the variability in the vertical direction is greater than the horizontal direction.

Key words: soil water content, variation coefficient, standard deviation, Nitraria sphaerocarpa, Calligonum mongolicum

中图分类号:

S152.7

张克海, 胡广录, 方桥, 张钰佳, 李浩然. 黑河中游荒漠绿洲过渡带固沙植被根区土壤含水量[J]. 中国沙漠, 2020, 40(3): 33-42.

Zhang Kehai, Hu Guanglu, Fang Qiao, Zhang Yujia, Li Haoran. Water content in the root zone of sand-fixation vegetation in desert-oasis ecotone in the middle reaches of the Heihe River[J]. Journal of Desert Research, 2020, 40(3): 33-42.

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