气候变化领域集成服务门户(CCPortal): Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau

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DOI	10.1016/j.catena.2023.107631
	Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau
	Yang, Ren-Min; Huang, Lai-Ming; Liu, Feng
发表日期	2024
ISSN	0341-8162
EISSN	1872-6887
卷号	235
英文摘要	Seasonally frozen ground (SFG) significantly contributes to global carbon sinks. Global warming and anthropogenic-induced disturbances threaten the carbon storage capacity of SFG. Challenges in evaluating the SFG carbon storage potential include the lack of understanding of the control mechanisms of soil organic carbon (SOC) variations and timely spatial estimates of SOC. In this study, we investigated SOC stocks in SFG in the Tibet Autonomous Region, China, in 2020 and 2021. We employed partial least squares structural equation modeling (PLS-SEM) to explore the effect of complex processes (interacting roles of climate, plant physiology and phenology, freeze-thaw cycle, soil environment, and C inputs) on SOC and mapped SOC stocks in the topmost 30 cm. We identified four causal pathways: (1) an indirect pathway representing the effect of climate on plant physiology and phenology through changes in freeze-thaw cycles and soil environment, (2) an indirect pathway representing the effect of climate on C inputs through changes in freeze-thaw cycles, soil environment and plant physiology and phenology, (3) an indirect pathway representing the effect of climate on freeze-thaw cycles, and (4) an indirect pathway representing the effect of climate on the soil environment through changes in freeze--thaw cycles. C inputs exerted the greatest control on SOC. The effect of these factors decreased with increasing soil depth. We used PLS-SEM to generate maps of SOC stocks in SFG at a 500 m resolution with a moderate accuracy. The estimated mean SOC stocks in the 0-30 cm layer reached 6.87 kg m(-2), with a 95% confidence interval ranging from 6.2 to 7.5 kg m(-2). Our results indicated that it is critical to consider the depth dependence of the direct and indirect effects of environmental factors when assessing the control mechanisms of SOC vari-ations. In this work, we also demonstrated that spatially explicit SOC estimates based on timely investigations are important for assessing C stocks against the background of considerable environmental changes across the Ti-betan Plateau.
关键词	Soil organic carbon PLS-SEM Tibetan Plateau Environment-soil response relationships Soil mapping
英文关键词	CLIMATE-CHANGE; TEMPERATURE SENSITIVITY; PERMAFROST; NITROGEN; FEEDBACKS; STORAGE; REGION; STOCKS
WOS研究方向	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS记录号	WOS:001112302900001
来源期刊	CATENA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283751
作者单位	Tianjin University; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Soil Science, CAS
推荐引用方式 GB/T 7714	Yang, Ren-Min,Huang, Lai-Ming,Liu, Feng. Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau[J],2024,235.
APA	Yang, Ren-Min,Huang, Lai-Ming,&Liu, Feng.(2024).Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau.CATENA,235.
MLA	Yang, Ren-Min,et al."Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau".CATENA 235(2024).