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| Soil CO2 Concentration under Different Types of Plant Communities and the Driving Factors in Arid Desert Area |
| Huang Lei, Zhang Zhishan, Hu Yigang, Yang Haotian |
| Shapotou Desert Experiment and Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Soil gas sample at different depths under different plant communities in the sand-fixing vegetation zones were obtained, and then the CO2 concentration in certain soil profiles and the impact of soil temperature and soil moisture on CO2 concentration were analyzed. The results showed that, Soil CO2 concentration under the Caragana korshinskii and Artemisia ordosica communities in the 0-80 cm soil layer increased with depth, the average value was 1 229.3 μmol·mol-1 and 1 242.7 μmol mol-1, respectively, which was larger than that in the same depth of mobile sand dunes (978.9 μmol·mol-1). The soil CO2 concentration under Artemisia ordosica community was more than the Caragana korshinskii community at 0-40 cm, but the direction was the opposite below 40 cm. Soil moisture and the soil CO2 concentration under different plant communities had consistency in the interannual timescale, soil CO2 concentration under the Artemisia ordosica plant community and the soil moisture content had the more significant relationship than the Caragana korshinskii community and sand at 0-40 cm soil depth, but under 40 cm, the order was Caragana korshinskii>Artemisia ordosica>sand. The influence of soil temperature to soil CO2 concentration was generally sand>Artemisia ordosica>Caragana korshinskii, especially in the surface layer, there was a significant correlation under the sand soil profile, and then decreased with soil depth. Soil temperature on soil CO2 concentration under the Caragana korshinskii and Artemisia ordosica communities was more complex, correlation analysis had showed that the correlation was smaller at 0-10 cm, and then rose at 10-40cm, but began to decrease in the 40-80 cm. In annual time scales, the soil moisture content was the key limiting factor of soil profile CO2 concentrations under different vegetation types, but in the daily time scale, the soil temperature was the main limiting factor. Furthermore, the root respiratory proportion of Caragana korshinskii and Artemisia ordosica communities was approximately 30.7% and 33.3%, respectively, at 0-80 cm from our study.
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Received: 28 August 2012
Published: 20 January 2014
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2014, Vol. 34 
