Influence of Freeze-thaw on CT Measured Soil Pore Structure of Alpine Meadow

ZHAO Yunduo; HU Xia

doi:10.13870/j.cnki.stbcxb.2020.03.052

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Influence of Freeze-thaw on CT Measured Soil Pore Structure of Alpine Meadow

更新时间：2025-03-12

- Influence of Freeze-thaw on CT Measured Soil Pore Structure of Alpine Meadow
- Vol. 34, Issue 3, Pages: 362-367(2020)
- 作者机构：
  
  1. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875
  2. 北京师范大学地理科学学部自然资源学院,北京,100875
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.03.052
  CLC： S152.4
- Published：2020
- 稿件说明：
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ZHAO Yunduo, HU Xia. Influence of Freeze-thaw on CT Measured Soil Pore Structure of Alpine Meadow[J]. 2020, 34(3): 362-367.
DOI：

ZHAO Yunduo, HU Xia. Influence of Freeze-thaw on CT Measured Soil Pore Structure of Alpine Meadow[J]. 2020, 34(3): 362-367. DOI： 10.13870/j.cnki.stbcxb.2020.03.052.

摘要

冻融是影响高寒地区土壤结构的重要物理因素，以青海湖流域高寒草甸作为研究对象，通过野外采集原状土柱、室内冻融循环模拟、CT扫描和图像解译等方法，研究冻融循环对高寒草甸冻胀丘和丘间地的土壤大孔隙结构特征的影响。结果表明，随着冻融循环次数的增加，高寒草甸冻胀丘和丘间地土壤大孔隙度均呈现"减小—增加—减小"的趋势，冻融循环对土壤大孔隙度的降低主要在第1次冻融循环内形成的，且大孔隙的平均等效直径、平均体积、平均分枝长度、分枝密度和节点密度的变化规律与大孔隙度变化规律基本一致；冻融循环对高寒草甸冻胀丘土壤大孔隙的影响明显大于丘间地，其土壤大孔隙度随土层深度变化存在2个峰值，受冻融循环的影响，峰值大小和位置有所变动，且30—80 mm土层深度的土壤孔隙结构较草毡层其他位置更为敏感。

Abstract

Freeze-thaw is an important physical factor affecting soil structure in alpine regions. Taking alpine meadow in Qinghai Lake basin as the research object

the influence of freeze-thaw cycle on the structure characteristics of soil macropores in the frost mounds and the inter space of frost mounds were studied through collecting undisturbed soil columns

simulating freeze-thaw cycle

conducting CT scanning and image interpretation. The results showed that with the increase of the freeze-thaw cycles

the soil macroporosity in the frost mounds and the inter space of frost mounds presented a trend of "decrease-increase-decrease"

and the decrease of soil macroporosity by freeze-thaw cycles was mainly formed in the first freeze-thaw cycle. The variation trends of the average equivalent diameter

average volume

average branch length

branch density and node density of macropores were basically the same as that of macroporosity. The effect of freeze-thaw cycle on the soil macropores in the frozen mound was significantly greater than that in the inter space of frost mounds. There were two peaks of the soil macroporosity along the depth in frost mounds

and the size and position of the peak value changed. Soil pore structure was more sensitive at a depth of 30—80 mm in the frost mounds than other depths of the felt layer.

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