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- W2916269533 abstract "Semiarid regions have substantial interannual variation in carbon exchange between terrestrial ecosystem and atmosphere but the diverse responses of carbon fluxes to climate variability are poorly known. We compared carbon exchange processes and the responses to environmental factors in a meadow steppe at Tongyu (TY) and a typical steppe at Maodeng (MD) using long-term continuous eddy covariance measurements. TY precipitation was 25% greater than MD. Both grasslands had interannual fluctuations of carbon sink and source and acted as weak carbon sinks averagely (−22.9 ± 41.0 gCm−2 yr−1 for TY and − 11.8 ± 45.0 gCm−2 yr−1 for MD). The seasonal dynamics of carbon fluxes were significantly related to water availability at MD but more strongly related to air temperature at TY. During dry years, the controlling effect of water availability on carbon fluxes increased. Summer precipitation and soil moisture played key roles in the interannual variations in carbon fluxes in both grasslands. At MD, net carbon uptake was negatively related to summer air temperature likely because warming induced water deficit decreased photosynthesis. Greenness index derived from PhenoCam images captured key phenological phases and diverse magnitude of canopy dynamics. The index was correlated with seasonal and annual variations in carbon fluxes at both grasslands, suggesting the potential of PhenoCam for monitoring the spatial and temporal variations in canopy dynamics in different semiarid grasslands." @default.
- W2916269533 created "2019-03-02" @default.
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- W2916269533 date "2019-06-01" @default.
- W2916269533 modified "2023-10-16" @default.
- W2916269533 title "Seasonal and interannual variations in carbon fluxes in East Asia semi-arid grasslands" @default.
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- W2916269533 doi "https://doi.org/10.1016/j.scitotenv.2019.02.378" @default.
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