黄土高原刺槐林细根生长与土壤水分的耦合关系  

Relationship between Fine Root Growth of Robinia pseudoacacia Plantation and the Soil Moisture in the Loess Plateau

作　　者：胡小宁[1,2,3] 赵忠[1] 袁志发[2] 王迪海[1] 郭满才[2] 李剑[1] 

机构地区：[1]西北农林科技大学西部环境与生态教育部重点实验室,杨凌712100 [2]西北农林科技大学理学院,杨凌712100 [3]杨凌职业技术学院,杨凌712100

出　　处：《林业科学》2010年第12期30-35,共6页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(30671673)

摘　　要：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).W a e-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（π6t-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.

关 键 词：黄土高原 刺槐 细根生长 土壤水 耦合模型 

分 类 号：S711[农业科学—林学] O29[理学—应用数学]