微咸水淋洗对土壤微团聚体的影响

Effect of Leaching with Mildly Saline Water on Soil Micro-aggregates

土壤微团聚体的组成反映了土壤物理性质的好坏,密切影响着土壤的保水、供水性能,是评价土壤肥力的重要指标之一。基于吉林西部苏打盐渍土壤改良的微咸水淋洗试验,研究了微咸水淋洗前后土壤微团聚体组成的变化和分形维数特征。结果表明,微咸水淋洗能够增加土壤中大于0.050mm微团聚体的数量,减少小于0.001mm微团聚体的数量,具有明显的团聚作用;微咸水淋洗区的土壤微团聚体分形维数下降,且与土壤容重呈极显著的相关关系,可以作为衡量土壤物理性质的重要指标。

Composition of soil micro aggregates reflected soil physical properties,and affected soil moisture and water supply closely,which was an important index of evaluation of soil fertility.Based on the leaching experiments with mildly saline water on saline-sodic soil in western Jilin province,the variation of soil micro aggregates structure and fractal dimension between CK and leaching treatment were studied.The results indicated that the leaching with mildly saline water had obvious aggregation role,which could increase the number of 0.05 mm soil micro aggregates,and reduce that of 0.001 mm.On the other hand,the fractal dimension of soil micro aggregates on leaching treatment drop clearly compared with CK,which correlated significantly with soil bulk density.So soil fractal dimension could be used as an important index of the measurement of soil physical properties.