气候变化领域集成服务门户(CCPortal): Factors controlling the spatial heterogeneity of soil organic carbon concentrations and stocks in a boreal forest

CCPortal

DOI	10.1016/j.geodrs.2023.e00749
	Factors controlling the spatial heterogeneity of soil organic carbon concentrations and stocks in a boreal forest
	Vitharana, U. W. A.; Casson, Nora J.; Kumaragamage, Darshani; Mishra, Umakant; Friesen-Hughes, Karl
发表日期	2024
ISSN	2352-0094
起始页码	36
卷号	36
英文摘要	Boreal soils play a crucial role in the global terrestrial carbon cycle, serving as significant carbon reservoirs. However, this region is experiencing rapid climate change which poses a threat to the stability of the soil carbon pool. To understand the carbon balance in the boreal region, it is essential to obtain accurate estimates of soil organic carbon (SOC) stocks. The objective of this study was to investigate factors controlling the spatial heterogeneity of SOC concentrations and stocks in a boreal forested catchment and to quantify spatial variability of SOC concentrations and stocks using a random forest -based regression kriging approach. Soil carbon content, gravel content and bulk density were obtained from the surface soil layer (0-30 cm) of 106 samples across a 390 ha catchment in northwestern Ontario, Canada. Spatial attributes including elevation, wetness index, distance to nearest ridge, relative position index, plan curvature, profile curvature and normalized difference vegetation index were used in the random forest -based regression kriging to estimate spatial heterogeneity of SOC stocks and concentrations across the catchment. Our results showed that shallow soils in well -drained upland areas contained low to moderate SOC concentrations (1.2-16.2%) while depressional wetlands had high concentrations (19.2-54.0%). Topographic variables, including wetness index were the strongest predictors of SOC concentrations, but SOC stocks were very heterogeneous across the study site (12.9-139.0 Mg ha- 1) and were not well explained by topographic or vegetation variables. The gravel content was highly variable (0-29.0%), and without accounting for this fraction, SOC stocks were overestimated by 52.5% in this landscape. These results emphasize the substantial catchment scale variability in SOC stocks in boreal landscapes and underscore the significance of considering both landscape -scale drivers and intrinsic soil properties when estimating soil carbon in this region. By understanding these factors, we can better manage and protect the important carbon stores in boreal soils.
英文关键词	Soil carbon stocks; Soil carbon concentrations; Boreal forest; Random forest
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001163307900001
来源期刊	GEODERMA REGIONAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304254
作者单位	University of Winnipeg; University of Peradeniya; United States Department of Energy (DOE); Sandia National Laboratories
推荐引用方式 GB/T 7714	Vitharana, U. W. A.,Casson, Nora J.,Kumaragamage, Darshani,et al. Factors controlling the spatial heterogeneity of soil organic carbon concentrations and stocks in a boreal forest[J],2024,36.
APA	Vitharana, U. W. A.,Casson, Nora J.,Kumaragamage, Darshani,Mishra, Umakant,&Friesen-Hughes, Karl.(2024).Factors controlling the spatial heterogeneity of soil organic carbon concentrations and stocks in a boreal forest.GEODERMA REGIONAL,36.
MLA	Vitharana, U. W. A.,et al."Factors controlling the spatial heterogeneity of soil organic carbon concentrations and stocks in a boreal forest".GEODERMA REGIONAL 36(2024).