不同植物群系土壤水分变化分析研究

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宁夏云雾山国家级自然保护区经过30多年的保护和建设,草原生态系统步入了良性循环。为了更好地了解黄土高原半干旱区典型草原生态系统不同植物群系土壤水分变化规律,笔者采用"烘干法"对保护区内不同植物群系土壤水分变化进行研究。结果表明,各个植物群系的土壤水分总体变化趋势都是随着土层的加深,土壤水分逐渐变小。铁杆蒿群系的土壤水分在各个土层都处在最高值,而百里香群系的土壤水分在各个土层都表现出较低的数值。其中,在60 cm~80 cm出现了所有土层的最低值(7.099%)。这可能是由于铁杆蒿群系的保水、蓄水能力
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