不同植被盖度沙质草地生长季土壤水分动态

doi:10.7522/j.issn.1000-694X.2018.00091

摘要/Abstract

摘要： 水分是干旱半干旱沙地生态系统最大的限制因子，研究植被盖度和土壤水分之间的关系有助于沙地生态恢复和保护。基于生长季科尔沁沙质草地不同植被盖度下土壤水分动态和降水的观测试验，分析了沙质草地植被盖度和土壤水分的耦合关系。结果表明：在土壤剖面上土壤水分存在明显的分层结构，依次为水分剧变层（0~40 cm）、缓变层（40~100 cm）和稳定层（100~180 cm）；植被盖度对土壤水分有很大影响，不同植被盖度下土壤含水量存在显著差异，土壤水分与盖度之间呈倒“V”型关系，土壤水分状况在28%的盖度下最优；不同的植被盖度下土壤水分对降水的响应也存在差异，在13%盖度下响应最敏感，28%和46%的盖度下响应微弱，后二者的土壤水分也相对稳定。在沙地生态恢复建设过程中合理的植被盖度配置可提高降水利用效率，并能使土壤水分和植被达到一种良好的平衡状态，从而有利于生态系统的稳定。

关键词: 沙质草地, 植被盖度, 土壤水分, 动态特征

Abstract: Soil water is the first restrictively factors in the arid-semi arid sandy ecosystem, so the study of the relationship between soil moisture and plant is advantaged to protect and restore the natural sandy ecosystem. Based on the field observation of soil moisture and precipitation in Horqin Sandy Land during the growing season in 2009 year, we explored the coupling relationship of soil moisture and plant coverage. The result showed that soil moisture had obvious stratification structure on soil profile, and the depth distribution profiles of soil moisture were as follows:the greatly changed layer (0-40 cm), the slowly layer (40-100 cm) and the steady layer (100-180 cm). The plant coverage had significant effect on soil moisture change, and the soil moisture content varied considerably between sample plot with different coverage, in which the relationship between soil moisture and coverage liked inverted "V". In addition, the responses of soil moisture to precipitation also had difference under different coverage, which was most sensitive under 13% plant coverage, but weaken under 28% and 46% coverage. Considering the moisture variations with plant coverage, our results suggested that the logical vegetation collocation will increase the precipitation use efficiency, as well as beneficial to form the mutual balance between soil moisture and vegetation, further conducive to the stability of sandy ecosystem.

Key words: sandy grassland, plant cover, soil moisture, dynamical feature

中图分类号:

Q948.112

王明明, 刘新平, 李玉霖, 车力木格, 罗永清, 孙珊珊, 魏静. 不同植被盖度沙质草地生长季土壤水分动态[J]. 中国沙漠, 2019, 39(5): 54-61.

Wang Mingming, Liu Xinpin, Li Yulin, Chelmeg, Luo Yongqing, Sun Shanshan, Wei Jing. Soil Moisture Dynamic under Different Plant Coverages in Sandy Grassland during Growing Season[J]. Journal of Desert Research, 2019, 39(5): 54-61.

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