摘要
本实验室研究应用发育于不同母质和不同利用方式的六种红壤,研究了持水特性和蒸发速度,结果表明,持水量主要决定于<0.01mm物理性粘粒含量,有机质含量,孔隙数量及不同孔径的组合,而蒸发速度则与粘粒含量和<0.005mm孔径的孔隙数量成正比.以比水容量达到10^(-2)ml/bar·g作为临界吸力值时各种土壤的吸力值;油泥土为0.1bar,黄筋泥,红紫砂土和黄泥砂土为0.3bar.从土壤条件考虑,上述土壤达到临界吸力值时一般应进行灌溉.
This laboratory study dealt With the water-retention characters and evaporation rate of six red soils which were derived from various parent materials and had various utilization ways. The results of this study showed that the water-retention capacities of the soils mainly depended on the contents of<0.01 mm physical clay and organic matter, porosity, and pore size distribution, but the evaporation rate of the soils was correlated positively with clay content and <0.005 ram Porosity.The order of reduction for water retention capacities and dewater rate in the soils was. waxy red soil>quaternary red clay>sandy red purple soil>sandy yellowish red soil. Taking 10-2ml/bar. g specific water capacity as a critical suction value for irrigation, suction value of waxy red soil is 0,1 bar and one of the other soils is 0.3 bar.
基金
农业部重点课题<南方红黄壤区域农业研究>中的<红黄壤水份运动规律及抗御季节性干旱措施>专题
关键词
红壤
持水性
蒸发速度
浙江
water-retention characters
evaporation rate
red soil
Jinhua prefecture
Zhejiang province
