摘要
本文研究表明，与荒地红壤相比，旱地红壤表土的物理性质已有明显不同，土壤容重和土壤阻力较低，而土壤孔隙度较高。但心土和底土层的物理性质仍类似荒地红壤，然而，这些土层中高水势段的释水性却比荒地红壤相应土层中的更低。年内不同时期内的贮水量，旱地红壤比荒地红壤高，因而伏秋旱期间土体中出现低于萎蔫含水量值的时间较迟，干旱深度较浅。旱地红壤0—300cm土体内的贮水库容中，在上半年已贮满水，在下半年0—100cm土体的贮水库容中，尚有较大空间可容水，但在100cm以下的土体中仍贮有相当量的水分。
This paper deals with the study on the dynamic changes of water content in upland red soil derived from Quaternary red clay in Jiangxi Province from 1990－1993. Results showed that the physical properties of upper layer of the upland red soil had apparent changes compared with those of the uncultivated red soil. For example,the soil bulk density and soil resistance were decreased, but the soil porosity was increased. The physical properties of that soil in the lower layer were still similar to those of uncultivated soil, but the water-releasing ability and specific water capacity were declined remarkably. Results also indicated that the wator storage of upland red soil in different periods of a year was higher than that of uncultivated red soil. As a result the delay of wilting point in surface layer appeared and the draught depth in soil was shallower in upland red soil in comparison with those in the uncultivated red soil. This behavior showed that the increase in the acceptance of rainfall and soil water content were beneficial to upland red soil after leveling reclamation of uncultivated red soil. According to the comparison of the water storage measured in field condition with the calculated data of water-storage volumetric capacity, the 0－300cm layer of upland red soil was basically filled with water during the first six months of a year.More pore space in wateri-storage volumetric capacity of 0－100cm layer of upland red soil could increase the acceptance of rainfall during the second half of a year but in that time richer water storage was still maintained beneth 100cm depth of that soil.Consequently, how to use the water storage in the deep soil layer would be of important significance for alleviation of the draught harm of hilly region in summer and autumn.
出处
《土壤学报》
CAS
CSCD
北大核心
1998年第1期16-24,共9页
Acta Pedologica Sinica
基金
国家自然科学基金!49471040
