【摘要】 本文提出了一种用于定量研究乔木树种林木根系固土作用的方法,并用此方法对人工刺槐和油松纯林林木根系的固土作用进行研究,分別找到了两个树种的单根固持力与根径之间的关系,得到了它们的回归方程式。利用对不同林龄林分林地各层深根参数的调查资料,并借助单根固持力与根一径关系方程式,分别估算了两个林分几个林龄梯度对林地各层深土的固持力。结果表明,两种林分对林地土壤的固持力均随林龄的增长而增大,刺槐林固持土壤的深度亦远远超过油松林。根据研究结果,对山西省吉县红旗林场不同年龄的人工刺槐林和油松林的固土作用作出了定量描述和价评。更多还原

【Abstract】 Pinus tabulaeformis Carr and Robinia pseudoacacia L. are main planting trees in Loess Plateau of China. According to the characteristics of reinforcement of tree roots to soil the measure method of pulling single root out, combined with investigating root parameters in the forest land, is desigened, and by which the reinforcement of P.tabulaeformis and R.pseu doacacia roots to soil are estimated. It was showed that: (1)the reinforcement of a single root appears the relation of power function with the root diameter; (2)the reinforcement of P.tabulaeformis and R.pseudoacacia roots increase rapidly with the forest stand age. After 15 years of planting, the increasing rate of R.pseudoacacia roots reinforcement slow down, but that of P.tabulaeformis roots keeps normal still; (3)the reinforcement of two stands in any ages decrease gradually with soil depth.At the same stand ages, the reinforcement of R.pseudoacacia roots at any depth is higher than that of P.tabulaeformis. In addition, the reinforcement depth of R.pseudoacacia root is deeper than that of P.tabulaeformis.更多还原