alexa Temporal Variation of Soil CO2 Efflux on Sloping Pastur
ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

Temporal Variation of Soil CO2 Efflux on Sloping Pasture of Heihe River Basin and Effects of Temperature and Soil Moisture on it

Zongqiang CHANG1,2*, Xiaoqing LiIU1,2, Qi FENG1,2 and Xuelong ZHANG3
1Alashan Desert Eco-hydrology Experimental Research Station, Cold and Arid regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
2Gansu Hydrology and Water Resources Engineering Center, Lanzhou 730000, China
3Academy of Water Resource Conservation Forests in Qilian Mountains of Gansu Province, Zhangye Gansu 734000, China
*Corresponding Author : Zongqiang Chang
Environmental and Engineering Research Institute
Chinese Academy of Sciences, Lanzhou 730000, China
E-mail: [email protected]
Received January 28, 2013; Accepted March 08, 2013; Published March 13, 2013
Citation: CHANG Z, LiIU X, FENG Q, ZHANG X (2013) Temporal Variation of Soil CO2 Efflux on Sloping Pasture of Heihe River Basin and Effects of Temperature and Soil Moisture. J Geol Geosci 2:111. doi:10.4172/2329-6755.1000111
Copyright: © 2013 CHANG Z, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Employing LiCor 6400 gas exchange analyzer and soil respiration chamber attachment (LiCor Inc., Lincoln, NE, USA), this paper continuously measured the soil surface CO2 effluxes on the sloping pasture of Heihe River basin from early April to late October 2010 to investigate the soil CO2 efflux rate and its feedback to the changes of climate and land use. The results showed that during the growing season, the diurnal variation of pasture soil respiration in the mountain watershed of the Heihe River valley was low at night, with lowest appears at 7:00, 6:30, 5:30, 5:00, 6:00 and 7:00 from May to October, and started to rise rapidly during 7:00~8:30, and then descend during 16:00~18:30. The maximum soil CO2 efflux appears at 15:00, 14:30, 14:30, 13:30, 14:00 and 15:00. The maximum of average soil CO2 efflux occurred in July and August, and the second was in May and September, and the third was in April and October. And it was basically consistent in April and October. The diurnal average of pasture soil CO2 efflux was between 0.31~6.98?mol m-2s-1, and the Q10 value is 2.16. Soil CO2 efflux had an exponential and Boltzmann correlation with temperature and soil moisture, respectively.


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