福建赤红壤旱地与红壤旱地水分特性的比较

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-10kPa~-30kPa就开始出现，而红壤旱地出现在-30kPa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。

A comparative study on soil water characteristics of lateritic red earth dryland and red earth dryland in Fujian province

This study explored that when 80% of available water was released, the t value (t value means soil moisture suction value when released available soil water is 80% of available soil water) of lateritic red earth dryland is smaller than that of red earth dryland. It showed that water conservation ability of the former was poorer than that of the latter The plants on the former are easier to subjected to drought than those on the latter. The water-storage volumetric capacity of lateritic red earth dryland (232.7 mm within 1m soil layer deep) is smaller than that of red earth dryand (321 mm within 1 m soil layer deep). When the specific water capacity begins to reach 10-2 level (this partition belongs to what is difficult to use in available water-storage), soil water potential is between -10 kPa--30 kPa to lateritic red earth dryland, while below -30 kPa to red earth dryland. It revealed losing water speed is faster in lateritic red earth dryland than that in red earth dryand. Therefore, water conservation and delivery ability of the former is weaker than that of the latter. At last, some factors influenced soil moisture characteristics of dryland were discussed in the paper.