若尔盖高原沼泽湿地与草地二氧化碳通量的比较  

CO_2 fluxes in mire and grassland on Ruoergai plateau

作　　者：王德宣[1] 宋长春 王毅勇[1] 赵志春[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所,长春130012

出　　处：《应用生态学报》2008年第2期285-289,共5页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重大资助项目(KZCX1-SW-01)

摘　　要：采用静止箱/气相色谱法,在2003—2005年的植物生长期对若尔盖高原沼泽湿地和草地的CO2通量进行了对比观测.结果表明:若尔盖高原沼泽湿地和草地CO2通量的平均值分别为203.22和323.03mg.m-2.h-1,前者为后者的60%左右.沼泽湿地常年积水的环境条件限制了土壤中的植物残体、根系及有机物质的分解,是沼泽湿地CO2通量低于草地并形成泥炭积累的重要因素.研究区沼泽湿地与草地CO2通量的季节变化与气温变化呈正相关,峰值一般出现在7月和8月;其日变化也与气温呈正相关,峰值一般出现在11:00—17:00.5cm深的土壤温度与CO2通量的相关性高于10和15cm深的土壤温度.With closed chamber and GC technique, a comparative study was conducted on the CO2 fluxes in mire and grassland on Ruoergai plateau during the plant growth period in 2003-2005. The results showed that the mean value of the CO2 fluxes in the three years was 203.22 mg · m^-2. h^-1 in mire and 323.03 mg · m^-2· h^ -1 in grassland, with the former being only about 60% of the latter. The perennially water-logging of mire limited the decomposition of plant residues, roots and organic substances, resulting in a lower CO2 flux in mire than in grassland. The seasonal changes of CO2 fluxes in mire and grassland were positively correlated with air temperature, the peak value being usually appeared in July or August, and the diurnal changes of the CO2 fluxes were also positively correlated with air temperature, the peak value being usually appeared between 11：00 and 17：00. The CO2 fluxes had a higher correlation with the soil temperature at the depth of 5 cm than at the depths of 10 cm and 15 cm.

关 键 词：CO2通量 若尔盖高原 沼泽湿地 草地 

分 类 号：Q14[生物学—生态学]