南方红壤入渗影响因素研究

Affecting Factors of Red Loam Infiltration of the South

认识土壤的降雨入渗性能,对于研究洪水过程、土壤侵蚀、土壤水分以及布设水土保持防治措施等具有重要的意义。在介绍试验设计等基本情况的基础上,对南方红壤区土壤前期含水率、降雨和不同植被条件(植被覆盖度)3种因素对土壤入渗的影响进行了研究,结果表明:当雨量和雨强较小时,土壤前期含水率越高则土壤入渗率就越低,但当雨量或雨强较大时,土壤入渗率都较低,这时土壤入渗率主要与降雨因子相关,受土壤前期含水率的影响不是很明显;在同一降雨条件下,不同处理小区土壤入渗系数大小顺序为百喜草全园覆盖、横坡套种作物、果园清耕、裸露对照。

It is significance for the study on flood process,soil erosion,soil moisture and layout of prevention and control measures of soil and water conservation to understand the performance of rainfall infiltration.Based on the basic introduction of test and design,the paper studies the influence of three factors of antecedent soil moisture,rainfall and different vegetation condition(coverage degree of vegetation) of red loam region of the South to soil infiltration.The outcomes show that when rainfall and rainfall intensity are smaller,the antecedent soil moisture is higher and soil infiltration lower;when rainfall and rainfall intensity are greater,all soil infiltration is lower,mainly correlates with rain factor and the influence of antecedent soil moisture is not obvious.Under the same rainfall condition,the degree sequence of soil infiltration of different treated plots is totally covered by Paspalum natatum,transverse-slope intercropping,orchards and uncovered check plots.