【摘要】 本文探讨桂南地区发育于第四纪红色粘土和花岗岩母质的赤红壤在低吸力段的持水性能,包括影响低吸力段持水量的因素、所吸持水分对植物的有效程度、用比水容量说明赤红壤在脱水过程中水分的有效程度。结果表明,桂平西山花岗岩发育的非耕种赤红壤持水性最好,农院牧场第四纪红色粘土发育的非耕种赤红壤最差,在0.015～0.9巴范围内非耕种赤红壤持水性比旱地好,赤红壤有效水范围很窄,易发生旱害。更多还原

【Abstract】 This paper deals with the retention ability for the low attractional sections of the red clay developed in the Fourtn Epoch and of the red soil developed from the maternal rock granite in the South Guangxi, including the factors affecting the retention ability of the low attractional Sections, the avalabillty of the retentive water to the plants, the availability of the water during the dehydration process described by specific water capacity , ml/bar·g. The results showed that, the retention ability of the uncultivated red soil developed from granite in Xishan. Guiping, was the best, and that of the uncultivated red soil developed in the Fourth Epoch in the pasture of the college was the worst. Ranged from 0.015-0.9 bar, the retention ability of the uncultivated soil was better than that of the upland. The range of the available water of the red soil was very narrow, and the droughts occur easily on the red soil.更多还原