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CO2 flux characteristics of the open savanna and its response to environmental factors in the dry-hot valley of Jinsha River, China

文献类型： 外文期刊

作者： Yang, Chaolei 1 ; Tian, Yufeng 1 ; Cui, Jingqi 5 ; He, Guangxiong 6 ; Li, Jingyuan 5 ; Li, Canfeng 1 ; Duan, Haichuang 2 ; Wei, Zong 1 ; Yan, Liu 1 ; Xia, Xin 1 ; Huang, Yong 1 ; Jiang, Aihua 1 ; Feng, Yuwen 7 ;

作者机构： 1.Yunnan Prov Observat & Res Stn Soil & Water Resour, Chuxiong 651400, Peoples R China

2.China Geol Survey, Kunming Gen Survey Nat Resources Ctr, Kunming 650111, Peoples R China

3.Minist Nat Resources, Technol Innovat Ctr Nat Carbon Sink, Kunming 650111, Peoples R China

4.Minist Nat Resources, Key Lab Coupling Proc & Effect Nat Resources Eleme, Beijing 100055, Peoples R China

5.Nanjing Univ Informat Sci & Technol, Inst Space Weather, Sch Atmospher Phys, Nanjing 210044, Peoples R China

6.Yunnan Acad Agr Sci, Trop Ecoagr Res Inst, Chuxiong 651300, Peoples R China

7.Bazhong Meteorol Off Sichuan Prov, Bazhong 636000, Peoples R China

期刊名称：BIOGEOSCIENCES （ 影响因子：3.9； 五年影响因子：4.7 ）

ISSN： 1726-4170

年卷期： 2025 年 22 卷 8 期

页码：

收录情况： SCI

摘要： The dry-hot valley ecosystem of Jinsha River (JS) is a non-zonal special heat island habitat within the global temperate region. Revealing the CO2 flux (Fc) changes and the response mechanisms of this ecosystem to environmental factors is crucial for accurately predicting the carbon (C) sequestration capacity of global terrestrial ecosystems, especially temperate ecosystems, under future extreme-drought climate conditions. We focused on the open savanna, which is a core component of the JS dry-hot valley plant community, as our research subject. Using the static chamber method, we conducted long-term fixed-point observations of Fc in the dominant grassy layer, explored the influence of different environmental factors on Fc, and analyzed the trends of Fc changes in the open savanna under future extreme-drought and low-rainfall climate scenarios. Fc of the open savanna exhibits distinct seasonal characteristics. During the dry season, it is in a C emission state, with a cumulative CO2 emission of 1.3215 tha-1. In contrast, during the rainy season, it shows significant C absorption characteristics, with a cumulative CO2 absorption of 0.6137 tha-1. The occurrence of extreme-drought events in the study area has weakened the C absorption capacity of the open savanna, making it a weak C source with an annual cumulative CO2 emission of 0.7078 tha-1a-1, indicating a C-neutral feature. The main environmental factors affecting the net ecosystem exchange (NEE) variations in the open savanna across different seasons were different, but overall, soil water content was the key environmental factor controlling NEE. The response mechanisms of NEE to changes in different environmental factors were generally similar, with NEE being at its minimum when located at the threshold of environmental factors. When environmental conditions exceed or fall below this threshold, the C emissions of the open savanna will increase. As the frequency and severity of future extreme droughts continue to rise, the C emissions from the open savanna in the study area will also continue to increase.

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