乌兰布和沙漠沿黄段风沙土有机质和碳酸钙含量特征

doi:10.16843/j.sswc.2022.01.006

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Abstract [Background] Soil organic matter (SOM) plays the role of binder in the formation of soil aggregates. The increase of calcium carbonate (CaCO₃) content can greatly reduce the lumpiness and stability of soil by changing the structure of soil microaggregates. However, some studies show that the increase of CaCO₃ content can also enhance the stability of soil through bonding. There is scarce precipitation, serious soil coarsening and frequent sandstorm weather in Ulan Buh desert, which limits the regional social and economic development.[Methods] The study was conducted in Ulan Buh Desert along the Yellow River. Three mobile, 3 semi-fixed and 3 fixed dunes were randomly selected, and three 1 m×1 m were randomly set up on the windward slope, hilltop, leeward slope and fields between dunes. Aeolian topsoil (0-5 cm) was selected by five-spot-sampling method. SOM content was determined using potassium dichromate volumetric method, while CaCO₃ content was measured using a calcium ion concentration meter. IBM SPSS 24 software was used for ANOVA. The least significant difference method was used to analyze the content of SOM and CaCO₃ of soil at different positions of dunes and in different types of dunes (α=0.05).[Results] 1) SOM contents of the soils in the mobile, semi-fixed, and fixed dunes were 17.14, 15.67, 22.13 g/kg and CaCO₃ contents were 0.98, 1.06, 1.57 g/kg, respectively. During sand dune fixation, SOM and CaCO₃ increased significantly (P<0.05). 2) In mobile dunes, the contents of SOM of topsoil at windward slope, hilltop, leeward slope and fields between dunes were 13.43, 16.06, 19.59, 19.91 g/kg, while the contents of CaCO₃ were 0.73, 0.80, 1.28, 1.21 g/kg, respectively. In semi-fixed dunes, the contents of SOM were 23.33, 17.32, 7.28, 10.91 g/kg, while the contents of CaCO₃ were 1.77, 1.05, 0.28, 0.78 g/kg, respectively. In fixed dunes, the contents of SOM were 17.55, 22.35, 25.31, 24.13 g/kg, while the contents of CaCO₃ were 1.43, 1.59, 1.70, 1.58 g/kg, respectively. 3) In mobile dunes, semi-fixed dunes, fixed dunes and on average level, the contents of CaCO₃ were positively correlative with the content of SOM by power function (R²=0.761, 0.873, 0.693, 0.809, P<0.01). In addition, with the increase of SOM content, the increase rate of CaCO₃ content in aeolian sandy soil of mobile dune and semi-fixed dune increased, while that of fixed dune slowed down.[Conclusions] Vegetation coverage and wind erosion intensity are the main reasons for the difference of SOM and CaCO₃ contents in different dune types and different positions. SOM plays an important role in the formation of CaCO₃. The conclusions can reveal the change rule of SOM and CaCO₃ during dune fixation, and deeply understand the wind erosion process of Ulan Buh Desert along the Yellow River.

Key words： soil organic matter soil calcium carbonate soil wind erosion erodibility Ulan Buh Desert

Received: 31 December 2019

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S157.1

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	Articles by authors
	A Lasa
	WANG Long
	GAO Guanglei
	ZHANG Ying
	CAO Hongyu
	DU Yujia
	LIU Xuefeng

Cite this article:

A Lasa,WANG Long,GAO Guanglei, et al. Content characteristics of organic matter and calcium carbonate of aeolian soils in Ulan Buh Desert along the Yellow River[J]. SSWC, 2022, 20(1): 41-47.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022.01.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2022/V20/I1/41

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