火干扰对寒温带落叶松—泥炭藓沼泽生长季CO_2排放的影响

Fire disturbance effects on CO_2 emission of Larix gmelinii-Sphagnum bog in cold temperate zone

2014年4—10月在大兴安岭呼中国家级自然保护区,运用静态箱—气相色谱法,对火灾后寒温带落叶松—泥炭藓沼泽CO_2生长季排放通量特征进行研究。结果表明:火烧对落叶松—泥炭藓沼泽生长季不同深度土壤温度有明显影响,并使得土壤含水率显著降低。火烧(M1)与对照(M0)样地落叶松—泥炭藓沼泽CO_2生长季平均排放通量分别为63. 02±10. 54、41. 85±6. 81 mg·m^(-2)·h^(-1)。M0与M1样地生长季CO_2排放通量变化均呈先升后降趋势变化,M0样地生长季CO_2排放通量峰值出现在6月份(74. 83±12. 38mg·m^(-2)·h^(-1)),M1样地CO_2排放通量峰值出现在7月份(100. 82±17. 58 mg·m^(-2)·h^(-1))。M0对照样地生长季CO_2排放通量与相应5、10、20 cm土壤温度,土壤含水率相关性均不显著。M1样地CO_2排放通量与5 cm土壤温度呈显著正相关,与10、20 cm土壤温度相关性不显著,与土壤含水率呈显著负相关。

CO 2 emission of Larix gmelinii-sphagnum bog in cold temperate zone after fire was determined in 2014 growing season in HuZhong National Nature Reserve of Greater Khingan Mountain by static box-gas chromatography method.Results as follows:Fire had obvious effects on the temperature of different depth soil,and soil water content was reduced in growing season.In growing season,the average CO2 emission flux of Larix gmelinii-sphagnum bog between fire disturbed(M1)and natural Control(M 0)plots were 63.02±10.54,41.85±6.81 mg·m-2·h-1,respectively.The both of CO 2 change flux between M0 and M1 plot showed a similar curve pattern,CO2 flux reached the peak at June in the M 0 plot(74.83±12.38 mg·m-2·h-1),and at July in M 1 plot(100.82±17.58 mg·m-2·h-1).There was no significant relation between CO2 emission flux and soil water content,and 5 cm,10 cm,20 cm soil temperature in M 0 plot.There was a significant positive relation between CO2 emission flux and 5 cm soil temperature,and an obvious negative relation with soil water content in M 1 plot.