【作者】 刘立新； 董云社； 齐玉春； 周凌晞；

【Author】 LIU Li-xin1,2, DONG Yun-she2*, QI Yu-chun2, ZHOU Ling-xi1(1. Chinese Academy of Meteorological Sciences, Centre for Atmosphere Watch and Services, Key Laboratory for Atmospheric Chemistry , CMA, Beijing 100081, China;2. Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China)

【机构】 中国气象科学研究院中国气象局大气成分观测与服务中心,中国气象局大气化学重点开放实验室； 中国科学院地理科学与资源研究所；

【摘要】 本研究于2004-2005年一个完整年度对内蒙古锡林河流域的贝加尔针茅草原、羊草草原、大针茅草原和克氏针茅草原4种草地类型的土壤呼吸速率及相关水热因子进行了野外原位测定,重点应用不同的数学模型和温度指标对草地土壤呼吸的温度敏感性问题进行了探讨.结果表明:Van′tHoff模型对温度变化较为敏感,表现出冬季的Q₁₀值明显大于夏季的特征,>5℃平均Q10值的变动范围为1.60～2.03;应用Arrhenius模型求算的不同季节的Q10值变化不大,平均值的变动范围介于1.48～1.67之间;两种模型均对水分的变化比较敏感,表现出Q10值随土壤水分的降低而升高的趋势,但尚不能确定土壤呼吸的温度敏感性问题与哪种温度指标更加密切相关.更多还原

【Abstract】 In order to study the sensitivity of soil respiration to temperature in the temperate semi-arid grassland ecosystem, the soil respiration and climatic factors in four temperate grassland communities were measured in site for a whole year in Xilin river of Inner Mongolia, China, and Q10 valve was calculated by using different models and different temperature indexes. The results indicated that the variation range of Q10 value was very large calculated by using the Van′t Hoff model, especially in winter, the average range was varied from 1.60～2.03 above 5℃. The variation range of Q10 value was very small obtained by using the Arrhenius model, and the average value of Q10 varied from 1.48～1.67. It was showed that Arrhenius model was not sensitive to the change of temperature when temperature was very low, but the two models both showed higher sensitivity to water, the Q10 value increased with the decrease of the soil moisture in different grassland communities. At the same time, it was still uncertain which temperature index was more closely related to the sensitivity of soil respiration to temperature.更多还原