赤红壤的贮水量及其有效性

Water-Holding Content and its Availability of Latored Soils

（１）赤红壤的贮水总量和有效水量的分布有明显的规律性．２—９月占全年的７０％左右，１０月—翌年１月占３０％左右．（２）赤红壤的有效水量占总贮水量的３１％—４４％，土壤肥力高的耕作赤红壤，其有效水量占总贮水量的３６％以上．在年降雨量小于１６００ｍｍ、蒸发量大于１１００ｍｍ的条件下．表土层有效贮水量低于萎蔫含水量出现的时间与土壤熟化程度有关，熟化度高的出现在１２月—翌年１月，熟化度低的往往出现在１０月—翌年１月．历时３—４个月．（３）赤红壤０—１００ｃｍ土体的贮水量及有效贮水量低于红壤而高于砖红壤．

The total water-holding content and available water capacity of latored soils present obvious distribution regularity, being about 70% of the yearly total in February to September, about 30% of the yearly total in October to the next January.The available water content accounts for 31% to 44% of the total water-holding capacity of latored soils, and more than 36% of that of Cultivated latored soils with high fertility. The occurrence of available water content lower than wilting point in epipedons is related with mellowness of latored soils. Under the condition of yearly rainfall<1600mm and yearly evaporation capacity >1100mm, the circumstance of available water content lower than wilting point occurs in December to the next January for high mellow latored soils, but occurs in October to the next January for less mellow latored .soils The total water-holdillg capacity and available water content of 0 to 100cm soil layer of latored soil is lower than that of red soil and higher than that of latosol.