Changes in soil aggregate water stability induced by wetting and drying cycles in non-saturated soil
Changes in soil aggregate water stability induced by wetting and drying cycles in non-saturated soil
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DOI：
10.1111/j.1365-2389.1982.tb01794.x
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发表时间：
1982-12
影响因子：
4.2
通讯作者：
W. Utomo;A. Dexter
中科院分区：
文献类型：
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作者：
W. Utomo;A. Dexter
小结 重塑土壤的湿润和干燥导致了水稳定的聚集。最大比例的水稳定性聚集体是由基质水势在 - 1 至 - 100 kPa 范围内的润湿和干燥产生的。这种效应发生在无菌和非无菌土壤中。但无菌土壤中水稳定性团聚体的比例较小。在实验室中对免耕土壤应用湿润和干燥循环导致水稳定团聚体的比例稳步下降。对于耕作的土壤，水稳定团聚体的比例首先增加到最大值，然后随着进一步的湿润和干燥循环而稳定下降。然而。对于经过消毒、耕作的土壤，仅观察到水稳定团聚体的比例稳步下降。耕作后田间自然含水量的波动使水稳定性增加，几天后达到最大值，然后稳定下降。该结果与实验室中获得的耕作结果相似。未经灭菌的土壤表明，微生物可能导致了观察到的田间团聚体水稳定性的短期变化。
Summary Wetting and drying of remoulded soil resulted in water stable aggregation. The greatest proportions of water stable aggregates arose from wetting and drying in the - 1 to - 100 kPa range of matric water potential. The effect occurred with sterile and non-sterile soil. but the proportion ofwater stable aggregates was less with sterile soil. The application of wetting and drying cycles in the laboratory to non-tilled soil resulted in a steady decrease in the proportion of water stable aggregates. With tilled soil, the proportion of water stable aggregates first increased to a maximum and then decreased steadily with further wetting and drying cycles. However. with sterilized, tilled soil, only a steady decrease in the proportion of water stable aggregates was observed. Natural water content fluctuations in the field after tillage gave an increase in water stability to a maximum after a few days followed by a steady decrease. The similarity of this result to that obtained in the laboratory for tilled. non-sterilized soil indicates that micro-organisms were probably contributing to the observed shortterm changes in the water stability ofaggregates in the field.