Soil Moisture Reduction Accelerates CO2 Emissions in Near-Saturated Cold and Wet Ecosystems
文献类型：期刊论文
| 作者 | Sun, Shaobo17; Che, Tao16; Wu, Chaoyang15; Li, Xin14; Sitch, Stephen13; Chen, Baozhang12; Wang, Lichun17; Yuan, Wenping6; Yang, Yuanhe2,3; Peng, Shushi6 |
| 刊名 | GLOBAL BIOGEOCHEMICAL CYCLES
 |
| 出版日期 | 2026-03-13 |
| 卷号 | 40期号:3页码:e2025GB008877 |
| 关键词 | soil respiration soil organic carbon climate change warming soil drying soil oxygen |
| ISSN号 | 0886-6236 |
| DOI | 10.1029/2025GB008877 |
| 产权排序 | 3 |
| 文献子类 | Article |
| 英文摘要 | Global cold and wet ecosystems, such as permafrost, northern peatlands, Arctic tundra, boreal wetlands, and alpine swamp meadows, store large amounts of soil organic carbon (SOC) and are typically water-rich. While it is well recognized that these ecosystems are highly vulnerable to climate warming as it accelerates SOC decomposition, how soil water levels regulate SOC decomposition and CO2 emissions specifically by constraining oxygen (O2) availability during the growing season remains poorly understood at large spatial scales. Here, we integrate field observations, global data sets, and process-based models to quantify how soil water dynamics influence CO2 emissions by regulating O2 diffusion across these ecosystems. Results from 107 field sites consistently reveal a protective effect of high soil water levels against SOC decomposition and CO2 release during the peak growing season (representing one-third of the year), suggesting that, beyond warming, the loss of this protection due to soil moisture reduction under near-saturated conditions is a critical driver of increased CO2 emissions. However, global data-driven data sets and process-based model simulations show divergent correlations between soil CO2 emissions and soil water levels. Many models, which rely on simplified soil moisture scalars or empirical functions to represent soil water level effects, inadequately reproduce the effects of soil water levels on SOC decomposition and CO2 emissions in cold and wet ecosystems. Our study underscores the urgent need to incorporate more mechanistic representations of soil water-mediated SOC decomposition into models and to improve spatially explicit hydraulic parameters, thereby enhancing projections of soil carbon-climate feedback. |
| URL标识 | 查看原文 |
| WOS关键词 | CARBON-DIOXIDE EXCHANGE ; WATER-TABLE LEVELS ; HETEROTROPHIC RESPIRATION ; GREENHOUSE-GAS ; LAND-USE ; INTERANNUAL VARIABILITY ; PERMAFROST CARBON ; ALPINE WETLAND ; METHANE FLUXES ; PEAT BOG |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:001713797800001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221197]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 通讯作者 | Song, Zhaoliang |
| 作者单位 | 1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; 2.China Natl Bot Garden, Beijing, Peoples R China; 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China; 4.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Prov Key Lab Integrated Agroenvironm Pol, Guangzhou, Peoples R China 5.Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo, Japan; 6.Peking Univ, Inst Carbon Neutral, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing, Peoples R China; 7.Univ Toulouse, Ctr Natl Rech Meteorol, Toulouse, France; 8.Univ Oslo, Dept Geosci, Oslo, Norway; 9.Ludwig Maximilian Univ Munich, Dept Geog, Munich, Germany; 10.Inst Appl Energy IAE, Tokyo, Japan; |
| 推荐引用方式 GB/T 7714 | Sun, Shaobo,Che, Tao,Wu, Chaoyang,et al. Soil Moisture Reduction Accelerates CO2 Emissions in Near-Saturated Cold and Wet Ecosystems[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2026,40(3):e2025GB008877. |
| APA | Sun, Shaobo.,Che, Tao.,Wu, Chaoyang.,Li, Xin.,Sitch, Stephen.,...&Song, Zhaoliang.(2026).Soil Moisture Reduction Accelerates CO2 Emissions in Near-Saturated Cold and Wet Ecosystems.GLOBAL BIOGEOCHEMICAL CYCLES,40(3),e2025GB008877. |
| MLA | Sun, Shaobo,et al."Soil Moisture Reduction Accelerates CO2 Emissions in Near-Saturated Cold and Wet Ecosystems".GLOBAL BIOGEOCHEMICAL CYCLES 40.3(2026):e2025GB008877. |
入库方式： OAI收割
来源：地理科学与资源研究所
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