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南亚热带高温多雨，年降雨量大而分布不均，台风雨季节降雨强度大，全年降雨多集中在4～9月，占全年的80％以上，因而大大地增加了降雨所引起的地表径流，径流也主要集中在多雨季节，特别是在5～8月，占全年降雨径流量的90％左右，形成了南亚热带坡地独特的地表径流特征．南亚热带的降雨入渗对表土层的影响较大，在暴雨过程中，0～30cm土层水分易产生饱和，因而易产生地表径流，从而减少水分入渗．这对作物生长产生不利的影响．
The rainfall in the south subtropical zone is hot and rainy with large annual rainfall and uneven distribution. The typhoon rainfall intensity is heavy throughout the year, and the annual rainfall mostly concentrates from April to September, accounting for more than 80% of the whole year, thus greatly increasing the surface caused by rainfall Runoff and runoff are also mainly concentrated in the rainy season, especially from May to August, accounting for about 90% of annual rainfall runoff, forming a unique surface runoff characteristics of the south subtropical slope. Rainfall infiltration on the south subtropical zone has a great influence on the topsoil. During the rainstorm, the moisture in 0 ~ 30cm soil layer tends to be saturated, which will lead to surface runoff and reduce water infiltration. This has an adverse effect on crop growth.