Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China
The intensification of carbon dioxide (CO2) fluxes in grassland ecosystems due to global climate change makes the achievement of carbon neutrality goals more challenging, particularly in arid regions with sensitive climates and fragile ecological environments. We employed the eddy covariance (EC) sy...
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Elsevier
2025-01-01
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| Series: | Ecological Indicators |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X24015267 |
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| author | Kun Zhang Yu Wang Ali Mamtimin Yongqiang Liu |
| author_facet | Kun Zhang Yu Wang Ali Mamtimin Yongqiang Liu |
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| description | The intensification of carbon dioxide (CO2) fluxes in grassland ecosystems due to global climate change makes the achievement of carbon neutrality goals more challenging, particularly in arid regions with sensitive climates and fragile ecological environments. We employed the eddy covariance (EC) system to quantify CO2 flux data and conducted a comprehensive analysis of the carbon balance in the alpine grassland ecosystem situated in the Central Tianshan Mountains. Multiple environmental factors were integrated for an attribution analysis of CO2 flux using advanced systems, including random forest model, hyperbolic tangent model, future scenario simulation, and stepwise multiple regression model. The results indicate that the Central Tianshan Mountain grassland ecosystem acts as a net carbon sink with an annual carbon sequestration capacity of 1.134 × 107 ton. When the photosynthetically active radiation (PAR) exceeds 1250 µmol m−2 s−1, the grassland ecosystem enters a state of light saturation. Under the SSP126, 245, and 585 scenarios, the grassland ecosystem carbon sink rates increase by 0.2 %, 0.7 %, and 0.9 % per degree Celsius for soil temperature and by 0.4 %, 1.17 %, and 1.28 % per degree Celsius for air temperature by the year 2100. This study provides reference data for CO2 fluxes in arid grassland ecosystems, enhances our understanding of the significance of grasslands in global carbon cycling, and offers crucial insights into the absence of carbon sinks in dry regions worldwide. |
| format | Article |
| id | doaj-art-8b1bd1fe6ee64583a8ea52f82f1ffaf6 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Ecological Indicators |
| spelling | doaj-art-8b1bd1fe6ee64583a8ea52f82f1ffaf62025-01-31T05:10:46ZengElsevierEcological Indicators1470-160X2025-01-01170113069Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, ChinaKun Zhang0Yu Wang1Ali Mamtimin2Yongqiang Liu3Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China; National Observation and Research Station of Desert Meteorology, Taklimakan Desert of Xinjiang, Urumqi 830002, China; Taklimakan Desert Meteorology Field Experiment Station of China Meteorological Administratin, Urumqi 830002, China; Xinjiang Key Laboratory of Desert Meteorology and Sandstorm, Urumqi 830002, China; College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, ChinaInstitute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China; National Observation and Research Station of Desert Meteorology, Taklimakan Desert of Xinjiang, Urumqi 830002, China; Taklimakan Desert Meteorology Field Experiment Station of China Meteorological Administratin, Urumqi 830002, China; Xinjiang Key Laboratory of Desert Meteorology and Sandstorm, Urumqi 830002, ChinaInstitute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China; National Observation and Research Station of Desert Meteorology, Taklimakan Desert of Xinjiang, Urumqi 830002, China; Taklimakan Desert Meteorology Field Experiment Station of China Meteorological Administratin, Urumqi 830002, China; Xinjiang Key Laboratory of Desert Meteorology and Sandstorm, Urumqi 830002, China; Corresponding author at: Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China.College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, ChinaThe intensification of carbon dioxide (CO2) fluxes in grassland ecosystems due to global climate change makes the achievement of carbon neutrality goals more challenging, particularly in arid regions with sensitive climates and fragile ecological environments. We employed the eddy covariance (EC) system to quantify CO2 flux data and conducted a comprehensive analysis of the carbon balance in the alpine grassland ecosystem situated in the Central Tianshan Mountains. Multiple environmental factors were integrated for an attribution analysis of CO2 flux using advanced systems, including random forest model, hyperbolic tangent model, future scenario simulation, and stepwise multiple regression model. The results indicate that the Central Tianshan Mountain grassland ecosystem acts as a net carbon sink with an annual carbon sequestration capacity of 1.134 × 107 ton. When the photosynthetically active radiation (PAR) exceeds 1250 µmol m−2 s−1, the grassland ecosystem enters a state of light saturation. Under the SSP126, 245, and 585 scenarios, the grassland ecosystem carbon sink rates increase by 0.2 %, 0.7 %, and 0.9 % per degree Celsius for soil temperature and by 0.4 %, 1.17 %, and 1.28 % per degree Celsius for air temperature by the year 2100. This study provides reference data for CO2 fluxes in arid grassland ecosystems, enhances our understanding of the significance of grasslands in global carbon cycling, and offers crucial insights into the absence of carbon sinks in dry regions worldwide.http://www.sciencedirect.com/science/article/pii/S1470160X24015267Central Tianshan mountainsGrassland ecosystemCO2 fluxEddy covarianceInfluencing factor |
| spellingShingle | Kun Zhang Yu Wang Ali Mamtimin Yongqiang Liu Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China Ecological Indicators Central Tianshan mountains Grassland ecosystem CO2 flux Eddy covariance Influencing factor |
| title | Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China |
| title_full | Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China |
| title_fullStr | Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China |
| title_full_unstemmed | Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China |
| title_short | Variation characteristics and influencing mechanisms of CO2 flux from grassland ecosystem in the Central Tianshan Mountains, China |
| title_sort | variation characteristics and influencing mechanisms of co2 flux from grassland ecosystem in the central tianshan mountains china |
| topic | Central Tianshan mountains Grassland ecosystem CO2 flux Eddy covariance Influencing factor |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X24015267 |
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