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Journal of Tianjin Normal University(Natural Science Edition) >

2026 , Vol. 46 >Issue 2: 35 - 44

DOI: https://doi.org/10.19638/j.issn1671-1114.20260205

Geography and Environmental Sciences

Spatial pattern and influencing factors of soil organic carbon density in Bohai Rim region

  • ZHOU Ming ,
  • WANG Yidong ,
  • GUO Changcheng
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  • 1. Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China;
    2. Geography Department, Tianjin Normal University, Tianjin 300387, China

Received date: 2024-11-18

  Online published: 2026-06-03

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Abstract

To elucidate the spatial variation patterns and influencing mechanisms of soil organic carbon density, the Bohai Rim region was selected as the studied area. Based on the soil datasets of SoilGrids250 m, HWSD, WISE30sec and GSDE, ArcGIS technology was used to analyze the spatial distribution characteristics of soil organic carbon density and storage. The effects of soil physicochemical properties, climate, and topographic factors on soil organic carbon density were explored through correlation analysis and random forest methods. The results showed that: ① In the Bohai Rim region, soil organic carbon density gradually increased from the southwest to the northeast at depths of [0, 30] cm, (30, 100] cm, and (100, 200]cm; ② There was spatial heterogeneity in soil organic carbon density estimated from the four datasets, mainly manifested in the eastern part of Liaoning Province and the northern part of Hebei Province. ③ There were differences in soil organic carbon storage under different land use types. The soil organic carbon storage in dry land was the highest, followed by forest land, grassland, and urban and rural land. ④ Total nitrogen, temperature, precipitation and normalized difference vegetation index were the main factors influencing soil organic carbon density.

Key words： Bohai Rim region; soil organic carbon; organic carbon density; correlation analysis; random forest

Cite this article

ZHOU Ming , WANG Yidong , GUO Changcheng . Spatial pattern and influencing factors of soil organic carbon density in Bohai Rim region[J]. Journal of Tianjin Normal University(Natural Science Edition), 2026 , 46(2) : 35 -44 . DOI: 10.19638/j.issn1671-1114.20260205

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