毛乌素沙地砒砂岩与沙复配土壤颗粒组成动态变化特征

doi:10.16843/j.sswc.2019.06.005

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Abstract [Background] Mu Us Sandy Land has the environmental conditions for developing ecologically high-value agriculture, soil texture is one of the important monitoring indexes in the process of desertification monitoring and evaluation in northern China, as a new type of compound soil of soft rock and sand in Mu Us Sandy Land, the stability of particle composition is the key to the sustainable development of soil.[Methods] The method was based on a combination of field positioning experiments and laboratory experiments conducted from 2010 to 2016, effect of soft rock as soil amendment on soil texture change and dynamic change trend was investigated in a field experiment in sandy soil in Mu Us Sandy Land in 2010-2016. Treatments including seven rates of soft rock to sandy soil in volume (0:1, 1:5, 1:2, 1:1, 2:1, 5:1 and 1:0) were conducted only in the laboratory before planting.[Results] 1) Compared with Aeolian sandy soil (0:1), with the increase of the content of soft rock, the silt and clay content of compound soil increased gradually, and the content of sand decreased, the maximum increase of silt content was 13.04 times, clay content was 2.02 times, the texture of compound soil gradually changed from sand-sandy loam-loam-silt loam, and soil particle size distribution tended to develop better. 2) With the increase of corn planting years from 2010 to 2016, the silt content in 1:1 compound soil increased by 173.0%, the clay content increased by 27.5%-178.8%. The silt content in the 1:2 compound soil increased by 83.3% and the clay content increased by 8.2%-187.2%. Silt content in 1:5 compound soil increased by 132.6%, and the clay content increased by 12.4%-72.6%. The coarse particles of the compound soil decreased, the fine particles increased, and the C/F (coarse particles/fine particles) value showed a decreasing trend, and the particle gradation of the soil layer tends to be rationalized, which improves the stability of the compound soil.[Conclusions] Therefore, the compounded soil can maintain a fine and stable development of the particle composition after many years of planting, and the plough layer of compound soil in different proportions tends to be refined, which is more conducive to the full mixing of soft rock and sand. This study demonstrates considerable theoretical and practical significance for understanding the evolutionary mechanisms of compound soil and the later agricultural management and improvement of Aeolian sandy soil.

Key words： compound soil soil particle composition texture dynamic change stability

Received: 24 January 2019

PACS:	S152.4
	S158.5

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	Articles by authors
	ZHANG Hai'ou
	XIE Jiancang
	NAN Haipeng
	HAN Jichang
	WANG Ni
	SUN Yingying
	ZHANG Lu

Cite this article:

ZHANG Hai'ou,XIE Jiancang,NAN Haipeng, et al. Dynamic change characteristics of soil particle composition of soft rock and sand compound soil in Mu Us Sandy Land[J]. SSWC, 2019, 17(6): 34-40.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.06.005 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I6/34

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