红壤坡地覆盖与敷盖径流调控特征研究

坡面径流是造成水土流失的主导因子,控制水土流失的关键是科学调控坡面径流。通过土壤水分渗漏装置(Drainage Lysimeter),探讨红壤坡地覆盖与敷盖径流调控特征。结果显示:不同处理不仅年总径流量存在差异,而且径流分配差异更明显;百喜草敷盖处理年总径流量最大,对照次之,百喜草覆盖最小;百喜草覆盖和百喜草敷盖处理的地表径流远小于对照处理,而地下径流量却超出对照处理许多;年均地表径流与地下径流调配比值百喜草覆盖、百喜草敷盖和对照处理分别为1/51.7,1/35.5和1/1.4。

Characteristics of Runoff Regulation and Control by Planting and Mulching Bahia Grass on Red Soil Slope

Slope surface runoff,as the main cause of water and soil loss,is of critical significance to be regulated and controlled scientifically.The characteristics of runoff regulation and control by planting and mulching Bahia grass on red soil slope are explored by adopting Drainage Lysimeter.It is revealed that the total annual runoff by different treatments varies,and the runoff distribution differs much more remarkably.The area mulched with Bahia grass has the largest total annual runoff,larger than that of the exposed ground surface,followed by that in the area planted with Bahia grass.The amounts of surface runoff in areas planted and mulched with Bahia grass are substantially smaller than that of the exposed ground surface;while the amounts of groundwater flow are much more than that of the exposed ground surface.The runoff distribution ratio of surface runoff to groundwater runoff in areas planted with Bahia grass,mulched with Bahia grass,and exposed ground surface is respectively 1/51.7,1/35.5 and 1/1.4.