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Hydrological Control of SOC Dynamics via Particle Size Redistribution Along Elevation Gradients in the Water Level Fluctuation Zone of the Three Gorges Reservoir

文献类型：期刊论文

作者Liu, Xianglong1,4; Li, Qiuhong3; Hong, Desheng1,4; Dong, Hongyang2; Yang, Bin1,4; Wang, Xiaoguo1
刊名AGRONOMY-BASEL
出版日期2025-11-04
卷号15期号:11页码:20
关键词water level fluctuation zone Three Gorges Reservoir soil organic carbon elevation particle size
DOI10.3390/agronomy15112555
通讯作者Wang, Xiaoguo(xgwang@imde.ac.cn)
英文摘要The water level fluctuation zone (WLFZ) of the Three Gorges Reservoir (TGR) represents a distinctive ecotone with inverted hydrological regimes, where elevation gradients play a critical role in determining the spatial distribution and stability of soil organic carbon (SOC). The objective of this study was to test whether soil particle size mediates the effects of hydrological fluctuations on SOC dynamics across elevation gradients. In this study, soils from three elevation zones (155-165 m, 165-175 m, and non-flooded zones) were collected, and bulk soil and particle-size fractions (sand, silt, and clay) were incubated for 60 days to assess SOC mineralization. The results indicated that the SOC stock in the main stream was greater at middle elevations (3.94 +/- 0.26 kgm-2) than at high elevations (3.20 +/- 0.18 kgm-2), whereas the SOC stock in the tributary was greater at high elevations (3.39 +/- 0.18 kgm-2). Random forest and linear regression analyses revealed that total nitrogen (TN) and sand contents were the primary factors controlling SOC. Despite its lower SOC content, the sand fraction presented significantly higher turnover rates (102.14 +/- 36.13 mu g CO2-Cg-1Ch-1) than the finer fractions, indicating lower carbon stability. These findings suggest that hydrological fluctuations regulate SOC by altering the soil particle-size composition across elevation gradients.
WOS关键词SOIL ORGANIC-CARBON ; MICROBIAL BIOMASS ; RIPARIAN ZONE ; FRACTIONS ; STABILIZATION ; MINERALIZATION ; EROSION ; DAMS ; AREA
WOS研究方向Agriculture ; Plant Sciences
语种英语
WOS记录号WOS:001623438000001
资助机构National Natural Science Foundation of China ; National Key Research and Development Program of China
源URL[http://ir.yic.ac.cn/handle/133337/41652]  
专题烟台海岸带研究所_中科院烟台海岸带研究所知识产出
通讯作者Wang, Xiaoguo
作者单位1.Chinese Acad Sci, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
3.POWERCHINA Chengdu Engn Corp Ltd, Chengdu 611130, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Xianglong,Li, Qiuhong,Hong, Desheng,et al. Hydrological Control of SOC Dynamics via Particle Size Redistribution Along Elevation Gradients in the Water Level Fluctuation Zone of the Three Gorges Reservoir[J]. AGRONOMY-BASEL,2025,15(11):20.
APA Liu, Xianglong,Li, Qiuhong,Hong, Desheng,Dong, Hongyang,Yang, Bin,&Wang, Xiaoguo.(2025).Hydrological Control of SOC Dynamics via Particle Size Redistribution Along Elevation Gradients in the Water Level Fluctuation Zone of the Three Gorges Reservoir.AGRONOMY-BASEL,15(11),20.
MLA Liu, Xianglong,et al."Hydrological Control of SOC Dynamics via Particle Size Redistribution Along Elevation Gradients in the Water Level Fluctuation Zone of the Three Gorges Reservoir".AGRONOMY-BASEL 15.11(2025):20.

入库方式： OAI收割

来源：烟台海岸带研究所

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