2007-06—2008-04,采用土钻法在黄土高原地区安塞县和泾川县刺槐人工林调查刺槐细根和土壤水分,发现刺槐细根表面积密度和土壤水含量随土层深度的变化有相似的趋势,建立细根表面积密度和土壤水含量随土层深度和时间(月份)变化的耦合模型S=pesin π/6 t-m ·Wae-bh。经验证,该模型能够很好地描述黄土高原地区刺槐细根生长与土壤水分之间的耦合关系,可反映细根生长和土壤水分随时间的周期性变化; 模型参数 a 的值介于0和1之间,表明刺槐根系生长仅利用了一部分土壤水分,不会造成研究区域刺槐林地土壤的干化。
In this paper, fine roots of Robinia pseudoacacia and the soil moisture were investigated using an auger in Ansai County and Jingchuan County of the Loess Plateau region from June 2007 to April 2008. A similar variation trend was found in both the fine root surface area density of Robinia pseudoacacia and the soil moisture, with the soil depth. A coupled model, S=pesin π/6 t-m ·Wae-bh, was established, describing the relationship between fine root surface area density and soil moisture, with soil depth and time. It is proved that the model could reflect the coupling relationship exactly. The fine root growth and soil moisture display annual cyclical changes in the model. The value of parameter a falls in between 0 and 1, which suggests the root growth of Robinia pseudoacacia just absorbs part of the soil moisture and could not cause soil desiccation in the investigated area.
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