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以东北典型黑土耕作区土壤为研究对象,通过对一季冻融交替后土壤团聚体、土壤楔入阻力、容重、孔隙度、饱和度、广义土壤结构指数等指标的测定和分析,对比研究了季节性冻融对黑土耕作土壤结构特征的影响.结果表明:季节性冻融加剧了黑土耕作区土壤风干团聚体的分散,但显著降低了水稳性团聚体的破坏率(P<0.05),表现出促进其团聚的作用;季节性冻融后黑土土壤楔入阻力降低了15.45%;容重趋于一致,在1.10～1.11g.cm-3之间;固相比例持续增加,总孔隙度与毛管孔隙度均不同程度降低;土壤饱和度总体增加了13.06%,削弱了土壤潜在贮水能力.季节性冻融改善了耕作区的土壤结构,使之更适于耕作.虽然季节性冻融增强了土壤团聚体的抗蚀性,却削弱了土壤的抗冲性,增加了黑土水蚀发生的风险.
Taking the soil in the typical black soil cultivation area of northeast China as the research object, the seasonal aggregates, soil wedging resistance, bulk density, porosity, saturation, generalized soil structure index and other indicators were measured and analyzed after the seasonal freeze-thaw cycles. The results showed that seasonal freezing and thawing aggravate the dispersion of air-dried aggregates in black soil cultivation area, but significantly reduced the failure rate of water-stable aggregates (P <0.05) The results showed that the wedging resistance of black soil was reduced by 15.45% after seasonal freezing and thawing; the bulk density tended to be consistent between 1.10 and 1.11 g · cm-3; the proportion of solid phase continued to increase; the total porosity and capillary Porosity decreased to varying degrees; soil saturation increased by 13.06% overall, weakening the potential water storage capacity of the soil. Seasonal freeze-thawing improved the soil structure of the farming area and made it more suitable for farming .Although the seasonal freeze-thaw enhanced Soil aggregate corrosion resistance, but weakened the soil impact resistance, increasing the risk of black soil water erosion.