A study on the simulation of carbon and water fluxes of Dangxiong alpine meadow and its response to climate changeOA
The alpine meadow ecosystem accounts for 27%of the total area of the Tibetan Plateau and is also one of the most important vegetation types.The Dangxiong alpine meadow ecosystem,located in the south-central part of the Tibetan Plateau,is a typical example.To understand the carbon and water fluxes,water use efficiency(WUE),and their responses to future climate change for the alpine meadow ecosystem in the Dangxiong area,two parameter estimation methods,the Model-independent Parameter Estimation(PEST)and the Dynamic Dimensions Search(DDS),were used to optimize the Biome-BGC model.Then,the gross primary productivity(GPP)and evapotranspiration(ET)were simulated.The results show that the DDS parameter calibration method has a better performance.The annual GPP and ET show an increasing trend,while the WUE shows a decreasing trend.Meanwhile,ET and GPP reach their peaks in July and August,respectively,and WUE shows a“dual-peak”pattern,reaching peaks in May and November.Furthermore,according to the simulation results for the next nearly 100 years,the ensemble average GPP and ET exhibit a significant increasing trend,and the growth rate under the SSP5–8.5 scenario is greater than that under the SSP2–4.5 scenario.WUE shows an increasing trend under the SSP2–4.5 scenario and a significant increasing trend under the SSP5–8.5 scenario.This study has important scientific significance for carbon and water cycle prediction and vegetation ecological protection on the Tibetan Plateau.
Lingyun He;Lei Zhong;Yaoming Ma;Yuting Qi;Jie Liu;Peizhen Li;
School of Earth and Space Sciences,University of Science and Technology of China,Hefei,ChinaSchool of Earth and Space Sciences,University of Science and Technology of China,Hefei,China CAS Center for Excellence in Comparative Planetology,Hefei,China Jiangsu Collaborative Innovation Center for Climate Change,Nanjing,ChinaKey Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing,China College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,China College of Atmospheric Sciences,Lanzhou University,Lanzhou,China Qomolangma Atmospheric and Environmental Observation and Research Station,Tingri,China Kathmandu Center for Research and Education,Chinese Academy of Sciences-Tribhuvan University,Beijing,China China-Pakistan Joint Research Center on Earth Sciences,Islamabad,Pakistan
生物学
Carbon and water fluxWater use efficiencyAlpine meadowBiome-BGC modelClimate change
《Atmospheric and Oceanic Science Letters》 2024 (005)
P.22-27 / 6
supported by the Second Comprehensive Scientific Research Survey on the Tibetan Plateau[grant number 2019QZKK0103];the National Natural Science Foundation of China[grant numbers 42375071 and 42230610].
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