香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响

发布时间：2018-05-30 11:03

  本文选题：根系 + 内摩擦角　； 参考：《草业学报》2017年07期

【摘要】：为探讨紫色土区草类根系特征及对土壤抗侵蚀性的影响,本试验选取坡地香根草和马唐为研究对象,分0~10cm、10~20cm和20~30cm土层采集根系和土壤样品,分别采用WinRHIZO(Pro.2004c)根系分析系统、ZJ型应变控制式直剪仪和改进的原状土冲刷水槽测定根系指标、根-土复合体抗剪和抗冲性能,研究了不同土层香根草和马唐的根系特征及与土壤抗侵蚀性之间的关系。结果表明,0~30cm土层范围内,香根草根系的总体指标和径级指标(根长密度、根表面积密度、根体积密度和根重密度)均优于马唐;较之马唐,香根草更有利于降低土壤容重,改善土壤微团聚体组成状况和提高土壤有机碳含量;上述2种草类根-土复合体的抗冲剪性能均表现为:0~10cm土层最优,10~20cm土层次之,20~30cm土层最差,且各土层均表现为香根草的优于马唐的;相关分析表明,1.0d(直径)≤2.0mm是影响复合体粘聚力和抗冲指数的关键径级,其次是径级d≤1.0mm。本研究结果可为紫色土区水土保持植被构建提供理论依据。
[Abstract]:In order to study the root system characteristics of grass in purple soil and its effect on soil erosion resistance, the root system and soil samples of Vetiveria villosa and Corydaceae were collected from 0 ~ 10cm ~ (10) cm ~ (10) ~ (10) cm and 20~30cm soil layers. The root system (WinRHIZOO Pro.2004c) was used to determine the root system index, the shear and impact resistance of root-soil complex, and the improved undisturbed soil scour flume. The relationship between root characteristics of Vetiver and Corydaceae and soil erosion resistance in different soil layers was studied. The results showed that the total index and diameter index (root length density, root surface area density, root volume density and root weight density) of Vetiveria villosa root were superior to those of Cortex chinensis in the soil layer of 30 cm. To improve the composition of soil microaggregates and increase the content of soil organic carbon, the impact and shear properties of the two recommended root-soil complexes were as follows: the best soil layer was 10 ~ (10) cm soil layer, the second layer was 20 ~ (30) cm soil layer, the next one was 20 ~ (30) cm soil layer. The correlation analysis showed that 1.0 d (diameter) 鈮，

本文编号：1955068