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›› 2017, Vol. 34 ›› Issue (4): 487-497.DOI: 10.7523/j.issn.2095-6134.2017.04.011

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Respiratory CO2 and CH4 emission fluxes from naturally grazing female yak in eastern region of Qinghai-Tibetan Plateau during alpine meadow growing season

XUE Dan1,2,3, XIONG Wan1, HE Yixin1, ZHU Dan1, WU Ning1,4, CHEN Huai1   

  1. 1. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
    2. College of Life Sciences, Sichuan University, Chengdu 610064, China;
    3. University of Chinese Academy of Sciences, Beijing 100049;
    4. International Centre for Integrated Mountain Development, GPO Box 3226, Kathmandu, Nepal
  • Received:2016-06-15 Revised:2016-10-14 Online:2017-07-15

Abstract: In order to reveal the characteristics of the greenhouse gas emissions from naturally grazing female yak in Qinghai-Tibetan Plateau during the growing season, a combination of face mask and GC methods was used to measure the respiratory CO2 and CH4 emissions from three age groups of yak. The results showed that age had a significant impact on greenhouse gas emission rate and emission flux. Feeding significantly influenced CH4 emission rate. The average emission fluxes of CH4 and CO2 in 1-2-year-old group were 54.59 and 2 663.71 g·head-1·d-1, respectively, and they were 80.48 and 3 715.17 g·head-1·d-1 in 3-4-year-old group and 84.45 and 4 663.55 g·head-1·d-1 in 5-6-year-old group, respectively. The respiratory CO2 and CH4 emission fluxes were positively correlated with yak biochemical parameters, which changed with age. The respiratory CH4 emissions of yak are lower than bovine raised by freely grazing in other regions.

Key words: methane, carbon dioxide, feed intake, age, biochemical parameters

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