兴凯湖平原表层土壤有机碳空间变异的主控因素

doi:10.11720/wtyht.2022.0186

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Abstract

Obtaining accurate soil organic carbon (SOC) content in the Xingkai Lake Plain and the main factor controlling its spatial variation is greatly significant for controlling and restoring the SOC content and achieving sustainable agricultural development. This study investigated the spatial distribution characteristics of the SOC content in the Xingkai Lake Plain and their control factor based on 4,151 topsoil samples collected at a depth of 0~20 cm in the field. Moreover, it compared the effects of soil parent materials, soil texture, soil type, land use type, and land reclamation duration (year) on the spatial distribution of the SOC content in the plain through geostatistical and regression analyses. The results are as follows. The SOC content in the topsoil of the study area is 0.35%~14.49% (average: 2.80%). It has a coefficient of variation of 0.44, indicating moderate spatial variations. It has a nugget-to-sill ratio of 47.06%, indicating that its spatial distributions are affected by both structural and random factors. It is low in the middle and west and is high in the east and north overall. All these five factors have significant effects on the SOC content (P<0.01). Among them, soil parent materials, soil type, land use type, and land reclamation duration can independently account for 6.8%, 3.8%, 9.2%, and 3.3% of the spatial variations in the SOC content, respectively. By contrast, soil texture can independently account for 30.1% of the spatial variations of the SOC content, which is far greater than that of the other four factors. Therefore, soil texture is the main control factor in the spatial distribution of the SOC content in the study area.

Key words： SOC spatial variation main control factor Xingkai Lake Plain

Received: 13 April 2022 Published: 03 January 2023

ZTFLH:

P632

Corresponding Authors: XU Jiang E-mail: 61421078@qq.com;465417944@qq.com

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	Articles by authors
	Ze YANG
	Yi-He ZHANG
	Hui-Min DAI
	Guo-Dong LIU
	Kai LIU
	Jiang XU

Cite this article:

Ze YANG,Yi-He ZHANG,Hui-Min DAI, et al. Control factor of the spatial variations in the soil organic carbon content in the topsoil of the Xingkai Lake Plain[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1076-1086.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.0186 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1076

Elevation, sampling sites(a) and land use(b) of the study area

Statistics of SOC content in topsoil

Histograms of SOC contents and its log-transformed values in the study area

Comparison of SOC content in topsoil between Xingkai Lake Plain and other regions

Theoretical semivariogram model for SOC content and parameters values in the study area

Isotropic semivariogram of SOC in the study area

Spatial distribution of SOC in the studyarea

Descriptive statistics characteristics of SOC content with different soil parent materials in the study area

Descriptive statistics characteristics of CIA with different SOC content in the study area

Descriptive statistics characteristics of SOC contents under different soil types in the study area

Descriptive statistics characteristics of SOC contents under different land use types in the study area

Descriptive statistics characteristics of SOC contents under different reclamation years in the study area

Regression analysis of SOC with different factors in the study area

CIA distribution of topsoil in the study area

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