辽西褐土和棕壤溅蚀效应与团聚体分选特征

doi:10.16843/j.sswc.2020.03.005

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Abstract [Background] As an important cultivated land resource, sloping land accounts for 82.65% of the total cultivated land area of western Liaoning province. In addition, due to poor vegetation coverage, the area of soil erosion accounts for 41.6% of the total area of this area, which is the most serious area of soil erosion in Liaoning province. Cinnamon soil and brown soil are the main types of soil in this area. Because of their loose structure and low content of organic matter, rainfall very easily causes soil erosion.[Methods] Typical sloping farmland of cinnamon soil and brown soil with a slope of 10° was selected to collect the topsoil (0-20 cm), and 5 sample points were selected according to the "S" sampling method. They were directly dug and bagged in the field, dried and screened through a 10-mm screen in the laboratory. Norton artificial simulated rainfall apparatus was used to conduct rainfall simulation experiments.[Results] 1)In the range of different horizontal distance, the total amount of spillage in the lower slope of brown soil is 4.25 times of that in the upper slope, and the total amount of spillage in the lower slope of brown soil is 4.85 times of that in the upper slope. When the horizontal distance between cinnamon soil and brown soil is 0-5 cm, the spillage amount is significantly different from that of other horizontal distance. 2)When the aggregate size was >1 mm, the enrichment rate of cinnamon soil was significantly higher than that of brown soil. When the aggregate size was <1.00 mm, the enrichment rate of brown soil was significantly higher than that of brown soil. 3)There were no >5.00 mm water-stable aggregates in the cinnamon soil and brown soil in the range of horizontal distance, >0.50-1.00 mm water-stable aggregates and >0.25-0.50 mm water-stable aggregates in the range of horizontal distance designed by the test. The average weight diameter of water-stable aggregates in different horizontal distance ranges of cinnamon soil and brown soil was less than 1 mm. With the increase of horizontal distance, the average weight diameter of cinnamon soil increased first and then decreased, while the average weight diameter of brown soil decreased gradually with the increase of horizontal distance.[Conclusions] The amount of spillage in different directions and the net amount of spillage and the spillage distance are logarithmically decreasing. The critical aggregate size for enrichment and loss of cinnamon soil and brown soil by splash erosion is 1.00 mm. Compared with brown soil, the aggregate size of >0.25-1.00 mm increases or decreases with the change of horizontal distance, which is cinnamon soil >brown soil.

Key words： slope farmland splash erosion amount water-stable aggregate sorting characteristics low mountain and hilly region of western Liaoning province

Received: 13 July 2019

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S157.1

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	Articles by authors
	DU Xinpeng
	Lü Gang
	FU Xinyang
	DONG Liang
	LI Yexin
	TANG Jiaxi

Cite this article:

DU Xinpeng,Lü Gang,FU Xinyang, et al. Splash erosion effect and aggregate sorting characteristics of cinnamon soil and brown soil in the western Liaoning province[J]. SSWC, 2020, 18(3): 39-47.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.03.005 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I3/39

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