Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model

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	Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model
	Zhang, Liankai; Qin, Xiaoqun; Liu, Pengyu; Huang, Qibo; Lan, Funing; Ji, Hongbin
刊名	Environmental Earth Sciences
	2015
卷号	74 期号:2 页码:945-952
英文摘要	Carbon sequestration resulting from carbonate rock weathering is closely linked to the global carbon cycle and has turned out to be important in the adjustment of atmospheric CO2 levels. Traditional karst dynamic models based on water-rock-gas interactions underestimate carbon sink fluxes related to carbonate rock weathering because they ignore the utilization of dissolved inorganic carbon (DIC) by aquatic organisms. In this study, a new model based on water-rock-gas-organism interactions was applied in the Pearl River basin, China, to recalculate atmospheric CO2 consumption and to develop an accurate estimation model for carbon sink fluxes at catchment scale. Stable carbon isotope (delta C-13) and C/N ratios were used in the counting processes. Data were collected from published literature as well as through field investigation and laboratory analysis. Results show that the Pearl River carbon sink in the Pearl River is 4.31 x 10(9) kg/a, i.e., 15.8 x 10(9) kg of atmospheric CO2 per year. Of this, the carbon sink resulting from carbonate rock weathering amounts to 2.14 x 10(9) kg/a, i.e., 49.7 % of the total. The three largest tributaries of Pearl River, Dongjiang, Beijiang, and Xijiang, respectively absorb 0.5 x 10(9), 1.19 x 10(9), and 2.62 x 10(9) kg of carbon from the atmosphere annually, accounting for 12, 28 and 60 % of the river's total carbon sink. When compared with the results of previous researches that disregarded the role of aquatic organisms, the new calculation method provides a carbon sink flux value that is 1.2-3.3 times higher, and 1.6 times higher on an average. To improve the calculation accuracy of atmospheric CO2 consumption in global karstic rivers, further research is needed regarding carbon sequestration mechanisms that involve aquatic organisms.
学科主题	环境地球化学
语种	英语
公开日期	2017-05-17
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6038]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Zhang, Liankai,Qin, Xiaoqun,Liu, Pengyu,et al. Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model[J]. Environmental Earth Sciences,2015,74(2):945-952.
APA	Zhang, Liankai,Qin, Xiaoqun,Liu, Pengyu,Huang, Qibo,Lan, Funing,&Ji, Hongbin.(2015).Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model.Environmental Earth Sciences,74(2),945-952.
MLA	Zhang, Liankai,et al."Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model".Environmental Earth Sciences 74.2(2015):945-952.