| 中国流域尺度岩溶碳汇的时空分布格局及其主控因子 |
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| 关键词:GEM-CO2 model watershed karst carbon sink endorheic basin exorheic basin influencing factors |
| 基金项目:本文由国家自然科学基金项目(编号: 42277077)、广西重点研发项目(编号: 桂科AB24010154)、国家自然科学基金重点项目(编号: 42430712)、自然资源部科技战略项目(编号: 2023-ZL-23)和中国地质调查局地质调查项目(编号: DD20230547)联合资助。 |
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| Watershed-scale Spatiotemporal Variability of Karst Carbon Sinks and Their Driving Factors in China |
| This study addresses the existing gap in watershed-scale evaluations of karst carbon sinks in China. Using the GEM-CO2 model and trend analysis, it reveals the heterogeneous characteristics of karst carbon sinks in China’s endorheic and exorheic basins. Correlation analysis quantifies the relationships between karst carbon sinks and precipitation, evapotranspiration, temperature, and net primary productivity (NPP). The key findings include: (1) The average annual carbonate carbon sink flux (CCSF) in China’s karst regions is 4.31 t C/km2/a, with an interannual total carbonate carbon sink flux (CSF) of approximately 1.19×107 t C/a. Bare carbonate rock weathering dominates the most (6.90×106 t C/a, 58.15%), followed by buried (3.97×106 t C/a, 33.43%) and covered types (1.00×106 t C/a, 8.42%). (2) From 2001 to 2023, CCSF in China showed a fluctuating upward trend, with notable spatial heterogeneity. The carbon sink intensity generally increased in central and eastern regions, but declined in the northwest. The overall trend indicates a modest increase (7.8 kg C/km2/a). (3) Watershed-scale analysis indicates that exorheic basins contribute 114.76×105 t C/a (96.65% of the total), forming the bulk of the carbon sink, with CCSF increasing in most areas. In contrast, endorheic basins contribute only 3.98×105 t C/a (3.35%), showing a widespread declining trend. (4) Precipitation is the primary driver of karst carbon sinks, though the impacts of precipitation, temperature, and NPP vary regionally. These insights support spatially targeted strategies of baseline surveys, potential assessments, and territorial spatial planning for carbon sequestration services. |
| HOU Yuxia,HUANG Fen,SUN Ping’an,XIAO Qiong,XIE Yincai,ZHANG Chunlai,YU Shi,LIU Huan.2026.Watershed-scale Spatiotemporal Variability of Karst Carbon Sinks and Their Driving Factors in China[J].Acta Geoscientica Sinica,47(4):895-910. |
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