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阐述了南亚热带低山、丘陵、台地赤红壤总库容、贮水库容、通透库容的占有情况。探讨了水库容的有效性以及不同利用方式的赤红壤有效水库容与无效水库容的差异，并对影响赤红壤水分有效性的因素作了分析．结果表明：赤红壤贮水库容小，尤其是有效水库容小；赤红壤水分有效性主要与土壤有机质相关。
This paper expounds the possession of total capacity, storage capacity and permeable storage capacity of loess plateau in southern subtropics, hills and terraces. The validity of reservoir capacity and the difference of effective reservoir capacity and invalid reservoir capacity of latosolic red soil in different ways were discussed, and the factors affecting the water availability of latosolic soil were analyzed. The results showed that the storage capacity of latosolic red soil reservoirs is small, especially the effective reservoirs are small; the availability of soil moisture in latosolic red soil is mainly related to soil organic matter.