Variations of CO2 exchange in the Kuye River basin and its influencing factors
Received date: 2020-06-29
Revised date: 2020-08-26
Online published: 2021-04-25
This study aimed to examine the riverine CO2 emissions on the Loess Plateau. The river water CO2 partial pressure (pCO2) and CO2 outgassing across the water-air interface (FCO2) in the Kuye River basin, situated in the northern Loess Plateau, was holistically investigated in July and October 2018 and March and June 2019 using a LI-7000 CO2 analyzer. Both pCO2 and FCO2 were higher in rivers (996 μatm and 94.5 mmol·m-2·d-1, respectively) than in reservoirs (752 μatm and 10.3 mmol·m-2·d-1, respectively). Meanwhile, the FCO2 exhibited pronounced seasonal variations. For the river waters, the highest FCO2 of 165.7 mmol·m-2·d-1 occurred in autumn, and the lowest FCO2 of 42.9 mmol·m-2·d-1 occurred in spring. For the reservoir waters, the opposite was observed with the highest FCO2 of 16.6 mmol·m-2·d-1 occurring in spring and the lowest FCO2 of -5.4 mmol·m-2·d-1 occurring in autumn. Spatially, the FCO2 in the tributary rivers (107.4 mmol·m-2·d-1) with a stronger biogeochemical activity was significantly higher than that in the Kuye mainstream (66.5 mmol·m-2·d-1) by 50%. While for reservoirs, the FCO2 of the reservoir waters (1.2 mmol·m-2·d-1) in the upper sandy hilly area was lower than that in the middle and lower loess hilly area (16.4 mmol·m-2·d-1). In summary, the pCO2 was mostly affected by the carbonate system, followed by dissolved organic carbon. Additionally, flow velocity had a substantial impact on the gas transfer velocity (k), whereas there was no significant correlation between k and wind speed. On an annual scale, both rivers and reservoirs were strong carbon sources for the atmosphere, and their average effluxes were close to that of the Yangtze River while substantially lower than that of the other tributaries in the middle Yellow River Basin.
SHI Hongyan,RAN Lishan,YUE Rong,YU Ruihong,ZHAO Yanxia,LYU Xixi . Variations of CO2 exchange in the Kuye River basin and its influencing factors[J]. Arid Zone Research, 2021 , 38(2) : 369 -379 . DOI: 10.13866/j.azr.2021.02.08
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