Effect of Freeze-Thaw on Water Stability of Aggregates in a Black Soil of Northeast China
查看参考文献34篇
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文摘
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Soil aggregate stability, an important index of the physical characteristics of a soil, can provide a good indication of a soil's erodibility, and deserves special consideration in regions with cold climate. The objective of this study was to study the effect of freeze-thaw on soil water-stable aggregates in the black soil region of Northeast China. Samples of a typical black soil in the region were collected to measure water-stable aggregates after freeze-thaw under different conditions (i.e., initial moisture contents, freezethaw cycles and freezing temperatures) by wet-sieving into eight particle size groups (> 10, 10-6, 6-5, 5-3, 3-2, 2-1, 1-0.5, and 0.5-0.25 mm). Freeze-thaw had the most effect on aggregate stability when the samples had an initial moisture content of 400 g kg~(-1). The water-stable aggregates of the four larger particle size groups (> 5, 5-3, 3-2, and 2-1 mm) reached a peak stability value, but those of the two smaller particle size groups (1-0.5 and 0.5-0.25 mm) reached a minimum value when the soil moisture content was 400 g kg~(-1). Water-stable aggregates of the four larger particle size groups decreased while those of the two smaller particle size groups increased with the increase of freeze-thaw cycles. As temperatures fell, the water-stable aggregates of the four larger particle size groups decreased while those of the two smaller particle size groups increased. |
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来源
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Pedosphere
,2014,24(2):285-290 【核心库】
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DOI
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10.1016/s1002-0160(14)60015-1
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关键词
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freezing temperature
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moisture content
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particle size
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water-stable aggregates
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地址
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College of Water Conservancy, Shenyang Agricultural University, Shenyang, 110866
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1002-0160 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5111199
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34
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