CO2 flux characteristics from degenerated mat cryo-sod soil during plant growing period

Abstract

Abstract: The carbon dioxide (CO₂) emission rate was studied in the degenerated mat cryo sod soil covered with alpine Kobresia humilis meadow at the Haibei alpine meadow ecosystem research station, with CID 301ps CO₂ analytical instrument during plant growth period (May-Sep, in1998). The results showed that the CO₂ emission rate had obvious daily variation and seasonal dynamics. The maximum rate of CO₂ emission appeared at 12:00～14:00, and the minimum rate appeared at 6:00～8:00. The max daily amplitude was 462.49 mg·m^-2·h^-1,while the minimum daily amplitude was 114.97 mg·m^-2·h^-1 .The CO₂ emission rate varied with phonological periods, and the order was exuberance>withering>green up. The maximum daily average value was 480.76 mg·m^-2·h^-1 (Aug.18th), and the minimum daily average value was 140.77 mg·m^-2·h^-1 (May.9th). Correlation analysis showed that there was a significant relationship between CO₂ emission rate and air temperature, soil surface temperature and soil temperature in 5 cm, 10 cm, 15 cm, 20 cm,and 30 cm. Temperature was the dominant factor that affected the CO₂ emission rate in degenerated mat cryo sod soil.

CLC Number:

S151

ZHOU Dangwei, CAO Guangmin, ZHANG Jinxia, ZHAO Xinquan, ZHOU Xingmin . CO₂ flux characteristics from degenerated mat cryo-sod soil during plant growing period[J]. Chinese Journal of Applied Ecology, 2003, (3): 367-371.

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CO₂ flux characteristics from degenerated mat cryo-sod soil during plant growing period

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