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作 者 ：王德宣;宋长春;王毅勇;赵志春

期 刊 ：应用生态学报 2008年 19卷 02期 页码：285-289

关键词：草地；

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323.03 mg·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—17:00.5 cm深的土壤温度与CO₂通量的相关性高于10和15 cm深的土壤温度.

Abstract: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.

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