白浆土土体构型改造的研究

 三年盆栽和田间试验表明：⒈淀积层混拌白浆层最适宜比例为1∶1和0.5∶1，增产率为12-52%。⒉改土增产机理在于：混拌以后，打破了紧实、板结的白浆层，土壤机械组成两层性和砂粘比发生了明显变化，白浆层复原性降低，土壤总孔隙和非毛管孔隙增加，土壤水分性质得到改善，混拌土层自身调节水分的能力得到提高，进而增强了土壤抗旱、抗涝性；活土层增厚到60厘米，增加了土壤库容，扩大了作物根系生活领域，根系可免受白浆层影响。

STUDIES ON TRANSFORMING CONSTITUTION OF PLANSOL SOLUM

The pot culture and the plot experiment tested for three years pointed out:1. The most suitable proportion of mixing B horizon and Aw horizon of plansol was 1:1 and 0.5:1. The rates of the yield in these proportions was 12% to 52%. 2. After B horizon mixed with Aw horizon, the proportion of the Sand/Clay of the soil and the restoring property of Aw horizon was improved. The total porosity and non-capillary porosity of the soil was raised. The soil that water properties was improved and regula ting capabilities of mixing horizon was increased could be able to resist effectively drought and waterlogging. The layer of root activity was added to 60cm, the storage cap acity of the soil was increased. This means that the root region of crops would be expanded and the roots will no the influenced, by Aw horizon of Plansol.