西南地区松属侧根的强度特征对其防护林固土护坡作用的影响  

Strength Characteristics of Lateral Roots of Pine Trees and Its Significance in Slope Stability of Pine Shelter-forest.

作　　者：周跃[1] 张军[2] 林锦屏[2] 骆华松[3] 徐强[3] 

机构地区：[1]昆明理工大学,昆明650093 [2]云南省地理研究所,昆明650223 [3]云南师范大学地理系,昆明650223

出　　处：《生态学杂志》2002年第6期1-4,共4页Chinese Journal of Ecology

基　　金：国家自然科学基金项目 (4 98710 5 4);云南省科学基金项目(98D0 0 7M和 97D0 0 6R);云南省中青年学术和技术带头人培养项目资助。

摘　　要：Soil reinforcement of tree roots is the main mechanical effect of shelter-forest on soil stability and slope protection, and the traction effect of lateral roots plays an important role in this concern in mountainous areas. The magnetite of this role rises positively with the tensile strength of the roots in the soil. This study developed a mechanical model of relationship between the tensile strength of roots and the traction effect used in pine forests. The results showed that the tensile strength of the pines mostly lays in a range of 5～25MPa, and decreased with diameter of the roots. In the depth interval of 0～60cm, the density of lateral roots of the three pines is relatively high, and the roots are able to increase the tensile strength of the rooted soil by 6 85～9 50 kPa, through traction effect. Though the strength of the pine roots and its role in increasing strength of the rooted soil are significant, the strength of the pines is lower than those of some broad leaved trees. This means that the pines have certain limitation on their role of shallow slope stability.Soil reinforcement of tree roots is the main mechanical effect of shelter-forest on soil stability and slope protection, and the traction effect of lateral roots plays an important role in this concern in mountainous areas. The magnetite of this role rises positively with the tensile strength of the roots in the soil. This study developed a mechanical model of relationship between the tensile strength of roots and the traction effect used in pine forests. The results showed that the tensile strength of the pines mostly lays in a range of 5～25MPa, and decreased with diameter of the roots. In the depth interval of 0～60cm, the density of lateral roots of the three pines is relatively high, and the roots are able to increase the tensile strength of the rooted soil by 6 85～9 50 kPa, through traction effect. Though the strength of the pine roots and its role in increasing strength of the rooted soil are significant, the strength of the pines is lower than those of some broad leaved trees. This means that the pines have certain limitation on their role of shallow slope stability.

关 键 词：西南地区 松属 侧根 强度特征 防护林 固土护坡作用 松树根系 侵蚀控制 模型 预测 

分 类 号：S157[农业科学—土壤学]