气候变化领域集成服务门户(CCPortal): Mechanisms driving spatial and temporal changes in soil organic carbon stocks in saline soils in a typical county of the western Songnen Plain, northeast China

CCPortal

DOI	10.1071/SR23198
	Mechanisms driving spatial and temporal changes in soil organic carbon stocks in saline soils in a typical county of the western Songnen Plain, northeast China
	Liang, Bing; Wei, Jianbing; Zhao, Haiqin; Wu, Shangyu; Hou, Yongxia; Zhang, Susu; Bini, Claudio
发表日期	2024
ISSN	1838-675X
EISSN	1838-6768
起始页码	62
结束页码	1
卷号	62 期号:1
英文摘要	Context The Songnen Plain is a crucial grain-producing region in China, and its western area, influenced by natural conditions and long-term human activities, faces severe issues of soil salinisation. In recent years, soil organic carbon (SOC) in saline-alkali soils has gained increasing attention as a material foundation for grain production and an essential carbon sink for mitigating climate change. However, the driving factors behind regional-scale changes in SOC in saline-alkali soils remain unclear.Aims This research was conducted to assess changes in soil organic carbon stocks and identify main driving factors in saline soils at 40-years scale.Methods Taking Tongyu County in the western part of the Songnen Plain as a case study, this research explored the spatiotemporal variation of soil organic carbon density (SOCD) and soil organic carbon storage (SOCS) from 1982 to 2022 using GIS. Random forest regression and structural equation modelling were employed to identify environmental factors influencing SOCD distribution in different soil layers.Key results (1) From 1982 to 2022, the average SOCD in the surface, subsurface, and bottom soil layers decreased by 0.65, 0.34, and 0.46 kg m-2, respectively, resulting in a total carbon storage reduction of 12.93 Tg C. (2) In 1982, the vertical distribution of SOCD was higher at the top and bottom layers and lower in the middle; however, by 2022, it exhibited a gradual decrease layer by layer. (3) Topographic factors only influenced surface SOCD, while the influence of environmental humidity and land use on SOCD decreased with increasing depth.Conclusions These findings provided valuable scientific insights for implementing regional soil carbon sequestration and soil nutrient conservation measures. The main contribution of this paper lies in exploring the driving mechanisms of changes in soil organic carbon storage over a 40-year period, based on the spatiotemporal distribution of soil organic carbon density, using random forest and structural equation models. This contribution holds significant theoretical and practical implications, providing a scientific basis for the improvement of saline-alkali soils and the development of carbon sequestration potential.
英文关键词	carbon sequestration; land use; machine learning method; NE China; soil organic carbon; soil profiles; spatio-temporal variability; structural equation modelling
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001150813100001
来源期刊	SOIL RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/291458
作者单位	Shenyang University; Shenyang University; Shenyang University; Shenyang University
推荐引用方式 GB/T 7714	Liang, Bing,Wei, Jianbing,Zhao, Haiqin,et al. Mechanisms driving spatial and temporal changes in soil organic carbon stocks in saline soils in a typical county of the western Songnen Plain, northeast China[J],2024,62(1).
APA	Liang, Bing.,Wei, Jianbing.,Zhao, Haiqin.,Wu, Shangyu.,Hou, Yongxia.,...&Bini, Claudio.(2024).Mechanisms driving spatial and temporal changes in soil organic carbon stocks in saline soils in a typical county of the western Songnen Plain, northeast China.SOIL RESEARCH,62(1).
MLA	Liang, Bing,et al."Mechanisms driving spatial and temporal changes in soil organic carbon stocks in saline soils in a typical county of the western Songnen Plain, northeast China".SOIL RESEARCH 62.1(2024).