Journal of Arid Land

, Volume 6, Issue 1, pp 27–36 | Cite as

Modeling the contribution of abiotic exchange to CO2 flux in alkaline soils of arid areas

  • WenFeng Wang
  • Xi ChenEmail author
  • GePing Luo
  • LongHui Li


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 \(F_c = R_{10} Q_{10} ^{{{\left( {T_{as} - 10} \right)} \mathord{\left/ {\vphantom {{\left( {T_{as} - 10} \right)} {10}}} \right. \kern-\nulldelimiterspace} {10}}} + r_7 q_7 ^{\left( {pH - 7} \right)} + \lambda T_{as} + \mu \theta _s + e\) 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.


soil respiration temperature sensitivity Q10 model soil abiotic CO2 exchange soil alkalinity 


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Copyright information

© Science Press, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • WenFeng Wang
    • 1
    • 2
  • Xi Chen
    • 1
    Email author
  • GePing Luo
    • 1
  • LongHui Li
    • 1
  1. 1.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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