冻融交替对砒砂岩与沙复配土壤团粒结构的影响

为研究冻融交替对砒砂岩与沙复配土壤团粒结构的影响,采用室内模拟冻融实验方法,研究了不同冻融周期和黏粒含量对复配土壤团粒结构的影响.结果表明:冻融周期、黏粒含量及二者的交互作用对复配土壤各级团粒结构组成均具有显著或极显著的影响.复配土壤黏粒含量越高,团粒结构的稳定性越高;在冻融作用下,随着复配土壤中沙比例的增大,大团粒结构含量总体呈降低趋势,降低速率先减小后增大,且砒砂岩与沙比例为1:1时大团粒结构降低的速率最小.结果说明冻融交替作用降低了土壤团粒结构的稳定性,将较大颗粒团粒结构崩解破碎成小粒级颗粒,更易于砒砂岩和沙复配成土.

Effects of freezing-thawing on soil aggregates of Pisha sandstone and sand compound soil

In order to study the effects of freezing-thawing on soil aggregates of Pisha sandstone and sand com-pound soil,this paper adopted laboratory simulation of freeze-thaw test method,setting up different frequency and clay content.The effect of freezing and thawing cycles,clay content and interaction of the two on soil aggregates of Pisha sandstone and sand compound soil was significant or extremely significant in all fractions. Under freezing-thawing frequency,reduce the rate of large soil aggregates first decreased and then increased with the increase of sand percentage in compound soil,and 1∶1 compound soil to reduce the rate of the minimum;It was found that freezing-thawing reduced the stability of soil aggregate structure,effectively breaking larger ag-gregate breakdown into small aggregate,so improving Pisha sandstone and sand compound soil.