寒温带落叶松林—泥炭藓沼泽火烧迹地生长季CH4、CO2排放特征

2014年4-10月在大兴安岭呼中国家级自然保护区,利用静态箱—气相色谱法,对寒温带落叶松林—泥炭藓沼泽火烧迹地生长季CH4、CO2排放通量特征进行研究。结果表明:寒温带落叶松—泥炭藓沼泽火烧迹地生长季CH4排放通量在8月初达到峰值(0.563±0.262mg·m^-2·h^-1)。生长季CH4的平均排放通量为0.121±0.098mg·m^-2·h^-1。寒温带落叶松—泥炭藓沼泽火烧迹地生长季CH4排放通量与土壤5cm、10cm、20cm温度,土壤含水率相关性均不显著。寒温带落叶松—泥炭藓沼泽火烧迹地生长季CO2排放通量变化呈先升后降趋势变化,在7月初寒温带落叶松—泥炭藓沼泽火烧迹地生长季CO2排放通量达到峰值100.82±17.58mg·m^-2·h^-1。生长季CO2的平均排放通量为63.02±10.54mg·m^-2·h^-1。寒温带落叶松—泥炭藓沼泽火烧迹地生长季CO2排放通量与5cm土壤温度呈显著正相关,与10、20cm土壤温度相关性不显著,与土壤含水率呈显著负相关。

Characteristics of CH4 and CO2 emissions of Larix gmelinii-Sphagnum bog burned ground in the growing season in cold temperate zone

The static flux-gas chromatography method was used to study the characteristics of CH4 and CO2 emission flux of Larix gmelinii-Sphagnum bog burned ground in the growing season in cold temperate zone,and the experiment was conducted in the Huzhong National Nature Reserve from April to October 2014.The results showed that the CH4 emission flux peak of the Larix gmelinii-Sphagnum bog burned ground was at the beginning of August(0.563±0.262mg·m^-2·h^-1).The average emission flux of CH4 in the growing season was 0.121±0.098 mg·m^-2·h^-1.The correlation between CH4 emission flux and soil 5cm,10cm,20cm temperature and soil moisture content were not significant in the growing season in Larix gmelinii-Sphagnum bog burned ground.The change of CO2 emission flux in the growing season was increased firstly and then decreased in Larix gmelinii-Sphagnum bog burned ground.At the beginning of July,the CO2 emission reached the peak value 100.82±17.58 mg·m^-2·h^-1.The average emission flux of CO2 in the growing season was 63.02±10.54 mg·m^-2·h^-1.The CO2 emission flux was significantly positively correlated with the soil temperature of 5cm,and the correlation with the soil temperature of 10,20cm were not significant,and it was significantly negatively correlated with soil moisture content in the growing season in Larix gmelinii-Sphagnum bog burned ground.