基于土壤有机碳含量的黑土层厚度预测及影响因素分析

doi:10.11720/wtyht.2024.1436

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Abstract

Black soil layer thicknesses, anessential attribute of black soil,serves as a significant indicator for measuring the fertility and erosion degree of black soil. Their spatial prediction holds critical significance for supporting China's black land conservation and ensuring food security.Considering the diagnostic characteristics of black soil layers in soil system classification, this study regarded soil layers with organic carbon content higher than 6×10^-3 of soil parent materials as black soil layers.Moreover, it derived the calculation formula for the thicknesses of black soil layers relying on the exponential distribution pattern of organic carbon in the vertical soil profile. Based on the 62 896 topsoil and 15 687 deepsoil organic carbon data obtained from the multi-purpose regional geochemical survey, this study conducted detailed spatial prediction of the thicknesses of black soil layers in the Songliao Plain and analyzed their relationship with soil types and climate factors. Key findings are as follows:(1) The thicknesses of black soil layers in the Songliao Plain range from 0 to 165 cm, with a median of 23.33 cm;(2) The spatial distribution of black soil layers exhibits significant heterogeneity, characterized by thin southwestern and thick northeastern portions;(3) The black soil layers of swampy soil and peat soil manifest the largest average thicknesses between 60 and 80 cm, followed by those of typical black soil (average thickness: 56 cm) and those of albic soil and meadow soil (average thickness: 40~50 cm);(4) The spatial distributions of the thicknesses of black soil layers are closely associated with climatic conditions, primarily showing a significant negative correlation with temperature and a positive correlation with rainfall;(5) The mean annual temperature of 0 ℃ is a significant temperature threshold for the development of thick black soil layers.Above this temperature, the average thickness of black soil layers exceeds 80 cm and no longer changes with temperature. With global warming, the southward shift of this 0 ℃ is otherm may significantly influence the thicknesses of black soil layers.

Key words： black land thickness of a black soil layer soil organic carbon multi-purpose regional geochemical survey Northeast China

Received: 11 October 2023 Published: 21 October 2024

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	Articles by authors
	Kai LIU
	Hui-Min DAI
	Guo-Dong LIU
	Shuai LIANG
	Ming-Hui WEI
	Ze YANG
	Yun-Hong SONG

Cite this article:

Kai LIU,Hui-Min DAI,Guo-Dong LIU, et al. Organic carbon content-baesd prediction and influencing factors of black soil layer thicknesses[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1368-1376.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1436 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1368

Data range and climatic conditions of the Songliao Plain

Exponential distribution curves of soil organic carbon content in the vertical direction under different conditions

Spatial distribution of organic carbon content in surface soils (a) and deep soils (b) of the Songliao Plain

Calculation results of black soil layer thickness
a—spatial distribution of black soil layer thickness; b—statistical histogram of black soil layer thickness; c—scatter plot of surface soil organic carbon content versus black soil layer thickness

Statistical of the average thickness of the black soil layer in different types of soils

Scatter plot of black soil layer thickness and annual mean temperature and precipitation

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