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试验在地表由生物土壤结皮覆被的荒漠人工固沙植被区进行,通过对0.45 hm2试验样地浅层(0—15 cm,0—30 cm)土壤水分连续动态(2005年4—10月)测定,基于经典时间稳定性理论分析,来揭示荒漠人工固沙植被区浅层土壤水分动态的时间稳定性特征。结果表明,无论在干旱或湿润条件下,浅层土壤水分都具有明显的时间稳定性特征,并且在土壤剖面30 cm深度表现得比剖面深度15 cm更为显著;在干旱条件下,两种土壤剖面深度的土壤水分时间稳定性特征均比湿润条件下显著。根据研究结果,初步确定了试验样地平均土壤水分含量的代表性测点。
The experiment was carried out on the surface of the desert artificial sand-fixing vegetation covered by biological soil crusts. The soil moisture in the shallow layer (0-15 cm, 0-30 cm) in the 0.45 hm2 experimental plot was continuously dynamic (April-October 2005) Based on the analysis of classical time stability theory, the temporal stability characteristics of shallow soil water dynamics in artificial sand-fixing desertification area are revealed. The results showed that the shallow soil moisture had obvious characteristics of time stability both in drought and humid conditions, and was more significant than the depth of 15 cm in 30 cm of soil profile. Under the condition of drought, both soil The temporal stability characteristics of soil moisture at section depth are more significant than those under wetting conditions. According to the research results, the representative measuring points of the average soil moisture content of the experimental plots were preliminarily determined.