Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau
文献类型：期刊论文
| 作者 | Yang, Ren-Min; Huang, Lai-Ming; Liu, Feng3 |
| 刊名 | CATENA
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 235页码:107631 |
| 关键词 | Soil organic carbon PLS-SEM Tibetan Plateau Environment-soil response relationships Soil mapping |
| DOI | 10.1016/j.catena.2023.107631 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 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. |
| WOS关键词 | CLIMATE-CHANGE ; TEMPERATURE SENSITIVITY ; PERMAFROST ; NITROGEN ; FEEDBACKS ; STORAGE ; REGION ; STOCKS |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001112302900001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/201008]  |
| 专题 | 黄河三角洲现代农业工程实验室_外文论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Yellow River Delta Modern Agr Engn Lab, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 3.Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100049, Peoples R China 4.Tianjin Univ, Sch Earth Syst Sci, Tianjin 300072, Peoples R China |
| 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]. CATENA,2024,235:107631. |
| 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,235,107631. |
| MLA | Yang, Ren-Min,et al."Evaluation and mapping soil organic carbon in seasonally frozen ground on the Tibetan Plateau".CATENA 235(2024):107631. |
入库方式： OAI收割
来源：地理科学与资源研究所
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