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《Acta Ecologica Sinica》 2001-04
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Carbon dioxide emission of Mat cryo-sod soil in the Haibei alpine meadow ecosystem

ZHANG Jin-Xia,CAO Guang-Min,ZHOU Dang-Wei,ZHAO Xin-Quan,ZHOU Xing-Min (Northwest Plateau Institute of Biology ,The Chinese Academy of Sciences,Xining,810001)  
The rate of Carbon dioxide emission was determined in the Mat cryo-sod soil covered with alpine Kobresia humilis meadow in the region of Haibei Alpine Meadow Ecosystem Research Station, using a CI-301PS photosynthetic instrument during the plant growing period (May~Sept.). The results indicated that: The CO 2 emission rate had significant diel fluctuation and seasonal dynamics.Maximum rate of CO 2 emission appeared at 14:00~16:00 and minimum at 6:00~8:00. The maximum diel amplitude was 797.75 mg/m 2·h (16 Aug.),the minimum amplitude was 197.33 mg/m 2·h (1 June) and the CO 2 emission rate of daytime was greater than that of night. Rate of CO 2 emission was different with changing of the phonological periods, and the pattern was observed in order of ExuberanceWitheringGreen up. During the plant growing period ,range,maximum and minimums value of diel CO 2 emission rate were 441.72±155.29 mg/m 2·h,681.06 mg/m 2·h and 176.65 mg/m 2·h,respectively. The rate of CO 2 emission in the degraded Mat Cryo-sod soil was lower than Mat Cryo-sod soil and the diel average value was less 137.47 mg/m 2·h than Mat Cryo-sod soil. Correlation analysis showed that CO 2 emission rate significantly correlated with air temperature, soil surface temperature and 5cm 10cm 15cm 20cm 30cm soil temperature. The temperature is a one of dominant factor, and it effects the rate of CO 2 emission in Mat Cryo-sod soil.
【Fund】: 国家重点基础研究发展规划项目! ( G1 9980 4 0 80 0 ) ;; 中国科学院青藏高原研究项目! ( KZ951 -A1 -2 0 4 KZ951 -A1 -30 1 ;;KZ 95T-
【CateGory Index】: S152
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