Effects of Atmospheric CO2 Concentration on Vegetation Transpiration over China
Received date: 2021-04-06
Revised date: 2021-05-22
Online published: 2021-09-22
Supported by
the National Key Research and Development Program of China "Heterogeneity and dynamic distributions of global atmospheric CO2 concentration and its spatio-temporal relationships with surface temperature"(2016YFA0602501);The National Natural Science Foundation of China "Research on the coupled model of land surface water, heat and CO2 fluxes using remote sensing data"(42071327)
In recent decades， a great increase of atmospheric CO2 concentration has （［CO2］） occurred due to fossil fuel combustion and industrialization， which has caused a series of ecological and environmental issues. One of the effects of the increase of ［CO2］ is on evapotranspiration （ET）. ET is a component of surface energy balance and water balance， therefore， its change would influence the exchange between surface and atmosphere and water cycle directly. On the basis of a water-carbon coupled model named PML-V2 and the CMIP6 ［CO2］ datasets， this study estimated two sets of vegetation transpiration （Ec） from 2001 to 2014. One simulation is static： the constant ［CO2］ concentration in 2001 is fixed as input during the simulation from 2001 to 2014. The other was dynamic： time-varying ［CO2］ was used during the simulation from 2001 to 2014. By comparing the two sets of Ec， the effects of ［CO2］ on Ec were explored. The results showed that the reduction in Ec due to the increase of ［CO2］ was smallest in summer and is largest in winter. From 2001 to 2014， this reduction is 0~5%. The largest effect occurred in the eastern and in the central areas of China. For ecosystems of forest， wetland， cropland and shrubland/savanna， the reduction of Ec due to the increase of ［CO2］ is 15~20 mm/a till 2014. For grassland， the reduction is 5 mm/a. The sensitivity of the effects of the increase of ［CO2］ on Ec to arid index， precipitation and air temperature indicated that Ec was the most sensitive to ［CO2］ in the southeast of China.
Jing TIAN . Effects of Atmospheric CO2 Concentration on Vegetation Transpiration over China[J]. Advances in Earth Science, 2021 , 36(8) : 826 -835 . DOI: 10.11867/j.issn.1001-8166.2021.078
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