新疆高山草甸草原植物群落夏季CO_2排放日变化分析  

The Analysis of Daily Variation of CO_2 Flux in Alpine Meadow of Xinjiang

作　　者：董自红[1] 蒋平安[1] 贾宏涛[1] 李慧[1] 程路明[1] 

机构地区：[1]新疆农业大学资源环境学院

出　　处：《新疆农业科学》2007年第1期1-5,共5页Xinjiang Agricultural Sciences

基　　金：全球环境基金(GEF)资助项目

摘　　要：首次利用静态暗箱法对具有代表性的典型高山草甸草原群落CO2排放进行了昼夜观测。结果表明,CO2排放通量日变化与气温、5cm和10cm地温呈明显的正相关关系,相关系数分别为0.9104、0.9173和0.8526,而与15、20和25cm地温相关性较小,说明在新疆高山草甸草原气温、5cm和10cm地温是影响草原群落CO2排放的关键性因子。研究还发现,新疆高山草甸草原植物群落排放CO2的近71%来自土壤呼吸、根呼吸和凋落物分解。The daily variation of CO2 flux in alpine meadow of Xinjiang was investigated with dark enclosed chamber technique. The results showed that CO2 flux frcrn alpine meadow is significantly positively correlated with 5 cm and 10 cm soil ground temperature and air temperature, the correlated coefficients between them are 0. 917 3,0. 852 6 and 0. 910 4 respectively and almost have no correlation with 15 cm and 20 cm、25 cm ground temperature . Therefore, 5 cm and 10 cm ground temperature and air temperature play key roles in the flux of CO2 from Alpine meadow. Moreover, our results also showed that there is amount of 71% CO2 flux emitted in Alpine meadow ecosystem coming from the soil respiration.

关 键 词：高山草甸 CO2排放通量 碳循环 

分 类 号：S812[农业科学—草业科学]