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释放８０％的有效水时赤红壤旱地的ｔ值（当释放的土壤有效水占有效水库容的比率为８０％时的土壤水吸力值）较小，表明赤红壤旱地持水性较红壤旱地更差，植物更容易受到干旱的协迫。赤红壤旱地贮水库容比红壤旱地小，赤红壤旱地的比水容量达到 １０－２数量级（难效水）在－１０ ｋＰａ～－３０ ｋＰａ就开始出现，而红壤旱地出现在－３０ ｋＰａ以下，表明赤红壤旱地的失水速度快，保水供水性能弱于红壤旱地。最后，讨论了影响旱地土壤水分性质的因素。
The t value of reddish brown arid drylands with 80% effective water released (soil water suction values when released soil effective water accounted for 80% of the effective water storage capacity) was small, indicating that the water retention capacity of dryland red soil is worse than that of red soil dryland Plants are more susceptible to drought. The storage capacity of red soil rhizosphere soil in dryland is smaller than that in red soil. The specific water volume of red soil rhizosphere reaches 10-2 orders of magnitude (hard water) in -10 kPa ~ -30 kPa, while that of red soil appears below -30 kPa. It shows that the dehydration rate of dryland of latosol is faster than that of red soil. Finally, the factors affecting the soil moisture in dry land are discussed.