冬小麦根系对土壤抗侵蚀能力的影响  

The Effect of the Wheat Roots on the Soil Erosion Resistance

作　　者：张鹏辉[1] 王健[1] 马璠[2] 刘振[1] 李鹤[1] 李鹏飞[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]宁夏农林科学院荒漠化治理研究所,银川750002

出　　处：《中国农村水利水电》2014年第7期7-9,共3页China Rural Water and Hydropower

基　　金：国家自然科学基金(41101268);西北农林科技大学青年专项基金(QN2011152)

摘　　要：土壤的抗侵蚀能力包括土壤的抗冲性和抗蚀性。根系的固结缠绕对土壤的抗侵蚀能力具有显著的影响。以不同含量的冬小麦根系的土样为研究对象,采用静水崩解法和抗冲槽法测定其抗冲性和抗蚀性。结果表明:根系能够降低土壤的崩解速率,即随着根系含量的增加,土壤崩解率缓慢降低。研究结果显示:土壤崩解过程可以分为吸水崩解阶段、快速崩解阶段、稳定崩解阶段3个阶段,随根密度增加,根系作用延长了土壤吸水崩解和快速崩解阶段,降低了土壤崩解速度。土壤抗冲刷系数随着根重密度的增加呈递增的二次函数关系。The soil erosion resistance includes soil antl-scourablllty and antl-erocllDlllty. The consolidation and winding of roots have asignificant impact on soil erosion resistance. In this paper, we study the anti-scourability and anti-erodibility of soil samples of winter wheat roots at different levels by using the hydrostatic disintegration method and the soil bins method. The results show that： the roots can decrease the soil disintegration rate and that it is slowly decreasing with the increase in the roots. The process of disintegra- tion can be divided into absorbent disintegration stage, rapid disintegration and steady disintegration stage. The absorbent disintegra- tion and rapid disintegration have become long with the increase in roots density. It shows an increments quadratic function relation- ship between the soil anti-scourability coefficient and root weight density.

关 键 词：小麦根系 土壤抗冲性 土壤抗蚀性 

分 类 号：S157.1[农业科学—土壤学]