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Journal of Arid Land  2014, Vol. 6 Issue (1): 27-36    DOI: 10.1007/s40333-013-0187-6
Research Articles     
Modeling the contribution of abiotic exchange to CO2 flux in alkaline soils of arid areas
WenFeng WANG1,2, Xi CHEN1* , GePing LUO1, LongHui LI1
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of
Sciences, Urumqi 830011, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  Recent studies on alkaline soils of arid areas suggest a possible contribution of abiotic exchange to soil CO2 flux (Fc). However, both the overall contribution of abiotic CO2 exchange and its drivers remain unknown. Here we analyzed the environmental variables suggested as possible drivers by previous studies and constructed a function of these variables to model the contribution of abiotic exchange to Fc in alkaline soils of arid areas. An automated flux system was employed to measure Fc in the Manas River Basin of Xinjiang Uygur autonomous region, China. Soil pH, soil temperature at 0–5 cm (Ts), soil volumetric water content at 0–5 cm (θs) and air temperature at 10 cm above the soil surface (Tas) were simultaneously analyzed. Results highlight reduced sensitivity of Fc to Ts and good prediction of Fc by the model Fc=R10Q10(Tas–10)/10+r7q7(pH–7)+λTas+µθs+e which represents Fc as a sum of biotic and abiotic components. This presents an approximate method to quantify the contribution of soil abiotic CO2 exchange to Fc in alkaline soils of arid areas.

Key wordsCalligonum arborescens      sap flow      environmental factor      growth parameter      Tarim Desert Highway     
Received: 03 February 2013      Published: 10 February 2014

This research was supported by the National Basic Research Program of China (2009CB825105).

Corresponding Authors: Xi CHEN   
Cite this article:

WenFeng WANG, Xi CHEN, GePing LUO, LongHui LI. Modeling the contribution of abiotic exchange to CO2 flux in alkaline soils of arid areas. Journal of Arid Land, 2014, 6(1): 27-36.

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