冻融循环作用对黑土水稳性团聚体特征的影响

doi:10.16843/j.sswc.2020.04.006

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Abstract [Background] The freeze-thaw cycle is one of the main driving factors of soil erosion. Freeze-thaw cycling changes soil properties and influences the processes of runoff and erosion on slopes, resulting in severe soil and water losses. Studying the effects of freeze-thaw cycles on the characteristics of black soil water-stable aggregates can provide a scientific basis for the prevention and control of soil erosion. [Methods] Selecting the cultivated layer of the typical black soil in the Northeast China as our research object, this paper studied the effects of initial water content and the freeze-thaw cycles on the particle size composition of soil water-stable aggregate, the destruction rate of aggregate particle size >0.25 mm (PAD_0.25), the destruction rate of aggregate particle size >1 mm (PAD_1.0), as well as the mean weight diameter and fractal dimension using the simulated freeze-thaw test method. [Results] The anhydrous freeze-thaw cycle significantly reduced the water-stable aggregates with particle size >5 mm, but PAD_0.25 and PAD_1.0 of the water-stable aggregates increased by 12.25% and 5.52% respectively than before. Mean weight diameter of the water-stable aggregates reduced by 6.01%, while fractal dimension of the water-stable aggregates increased by 1.61%. The changes of mean weight diameter and fractal dimension promoted the breaking of large aggregates. The water freeze-thaw cycling significantly increased the water-stable aggregates with particle size <0.5 mm. PAD_0.25 and PAD_1.0 increased by 78.72%-132.31% and 81.44%-184.94% respectively. Mean weight diameter of the water-stable aggregates reduced by 6.03%-8.83% (P<0.05), but fractal dimension of the water-stable aggregates increased by 69.26%-75.06% (P<0.05) compared with before. Both of the mean weight diameter and fractal dimension intensified the breaking effect of water-stable aggregates. In addition to the initial moisture content, the freeze-thaw cycling frequency is also a key factor affecting the stability of soil aggregates. With the increase of freeze-thaw cycles, PAD_0.25 and PAD_1.0 increased significantly. On the contrary, the average weight diameter decreased gradually. Especially after 10 freeze-thaw cycles, PAD_1.0 reached 87.04%-96.43%, and the mean weight diameter decreased 62.35%-71.18%. With the further increase of freeze-thaw cycles, no significant changes were observed for the average weight diameter, fractal dimension and PAD_1.0. [Conclusions] Generally, the freeze-thaw cycle could change from the large aggregates to small aggregates, and decrease the water stability of the black soil aggregates. The breaking effect of freeze-thaw cycle on water-stable aggregates increases gradually and tends to be stable finally with the increase of initial water content. The water stability of soil aggregates decreases significantly with the increasing freeze-thaw cycles, and gradually stabilizes after 10 freeze-thaw cycles.

Key words： freeze-thaw cycle stability of soil aggregates water stability of aggregates fractal dimension black soil

Received: 24 May 2019

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S157

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	GU Wangming
	ZHOU Jinxing
	WANG Bin
	GUAN Yinghui

Cite this article:

GU Wangming,ZHOU Jinxing,WANG Bin, et al. Effects of freeze-thaw cycle on the characteristics of black soil water-stable aggregates[J]. SSWC, 2020, 18(4): 45-52.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.04.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I4/45

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