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Interannual Change Control Mechanism of Carbon Flux in Inland River Basins in Cold and Arid Regions
Wang Tonghong, Wang Xufeng, Zhang Songlin, Tan Junlei, Zhang Yang, Ren Zhiguo, Bai Xuejie
PDF(4238 KB)
PDF(4238 KB)
Interannual Change Control Mechanism of Carbon Flux in Inland River Basins in Cold and Arid Regions
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In order to understand the interannual variation and control mechanism of carbon fluxes in inland river basins in cold and arid regions, an integrated watershed-scale flux observing network has been constructed for the main ecosystems in the Heihe River basin, including alpine ecosystems in the upper reaches and arid ecosystems in the lower reaches. The observed data analysis indicates that the annual net ecosystem productivity (NEP) and annual gross primary productivity (GPP) were the largest at the cropland site (maize, 729.81 g C/m2/a and 1 184.60 g C/m2/a) and the smallest at the Gobi desert site (94.18 g C/m2/a and 134.97 g C/m2/a) in the Heihe River basin. As to the annual ecosystem respiration (Reco), the wetland ecosystem was the largest (460.22 g C/m2/a), and the Gobi desert ecosystem was the smallest (41.18 g C/m2/a). The explaining capacity of the temperature to GPP, NEP and Reco inter-annual variability is higher in the alpine ecosystems than that in the arid ecosystems. In comparison, the explaining capacity of the soil moisture to GPP, NEP and Reco inter-annual variability is lower in the alpine ecosystems than that in the arid ecosystems. In the upper reaches, GPP, NEP and Reco are positively correlated with GPP, NEP, Reco among sites, but the opposite is true in the middle and down reaches. The shallow soil moisture is positively correlated with NEP, GPP and Reco among all sites in the Heihe River basin. In the upstream, shallow soil moisture is more closely correlated with NEP, GPP and Reco than deep soil moisture, but the deep soil moisture is more closely correlated with NEP, GPP and Reco than shallow soil moisture in the middle and lower reaches.
carbon / Heihe River basin / gross primary productivity / net ecosystem productivity / ecosystems / environmental geology
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