Variation of Soil Moisture under Shrubs during Growing Season on the Western Loess Plateau
Received date: 2012-09-02
Revised date: 2012-09-28
Online published: 2012-09-28
以兰州干旱地区生态植被恢复技术研究与示范基地灌木品种研究小区为试验点,研究了黄土高原西部丘陵区坡面不同灌木下0～200 cm土层土壤水分特征,采用Brown-Forsythe检验方法和变异系数比较不同灌木覆盖下土壤水分含量的差异。结果表明:土壤水分的变化受到坡位、坡向、灌木种类的影响较大。相同土层的土壤水分变异系数基本为阴坡>半阴坡>半阳坡>阳坡。坡上部的土壤水分变化较大,坡中部和坡下部相对较稳定。多数灌木的土壤水分变异系数随着土壤深度的增加而减小,变异系数较大值相对集中在20～80 cm土层。从土壤水分的亏缺量、植物水分亏缺度来看,在植被恢复的过程中,选择荒漠锦鸡儿(Caragana roborovskyi)、甘蒙锦鸡儿(Caragana opulens)、枸杞(Lycium chinense)等耗水量相对较低的植被更加合理。
关键词： 土壤水分; 变异规律; Brown-Forsythe检验; 黄土高原
李小英 , 段争虎 , 谭明亮 , 陈小红 . 黄土高原西部人工灌木生长季土壤水分变异特征[J]. 中国沙漠, 2013 , 33(6) : 1759 -1765 . DOI: 10.7522/j.issn.1000-694X.2013.00262
To provide theoretical evidence for vegetation recovery on the Western Loess Plateau, this paper analyzed variation of soil moisture, and tested the difference of soil moisture in different layers between shrubs by Brown-Forsythe method, taking shrubs as study object. The experimental plot of Laohutai in Lanzhou was selected as research site. The results show that variation of soil moisture is influenced by slope position, slope direction and shrub characteristics. The variation coefficient of soil moisture in the same soil layer is ranked in the descendant order of shaded, semi-shaded,semi-lighted, lighted slope. The variation coefficient of soil moisture in the central slope and lower slope are more stable than that on upper slope. The soil moisture in the depth of 20-80 cm varied obviously and the variation coefficient of soil moisture of most shrubs decreased as depth increased. Based on the soil water storage and water deficit degree of shrub, Caragana opulens, Caragana roborovskyi, Lycium chinense, which consume less water, were more suitable to be planted on research field in plantation recovery process.
Key words： soil moisture; variation patterns; Brown-Forsythe test; Loess Plateau
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