大兴安岭重度火烧迹地植被恢复过程中甲烷通量及其影响因素

Methane Flux and Affecting Factors in the Process of Vegetation Restoration in Burned Area of Great Xing'an Mountains

为研究大兴安岭重度火烧迹地在植被恢复过程中甲烷通量变化及其影响因素,采取时空替代法,运用静态箱-气相色谱法,对不同恢复年限的兴安落叶松人工林甲烷通量进行了原位观测。结果表明,大兴安岭重度火烧迹地经过植被恢复后生长季期间均为CH4的汇。植被恢复年限越长吸收CH4的总量越大,恢复了28 a的兴安落叶松人工林土壤对CH4每个生长季的吸收量(238.340 mg·m^-2)超过了天然次生林(201.128 mg·m^-2);重度火烧迹地在植被恢复过程中土壤CH4通量与土壤温度之间存在显著的相关性(P<0.05);该区域大气温度不是影响土壤CH4通量的主要影响因子,气温与土壤CH4通量之间不存在显著的相关性。

In order to understand the effects of vegetation restoration on the methane flux in severely burned areas of Great Xing'an Mountains,the methane flux was studied by using static chamber-gas chromatograph technique.The results showed that in growing season,the forest soil was the sink of CH4 after vegetation restoration.The total absorption of CH4 increased with the growth of Larix gmelinii plantations.The absorption of CH4 in 28 a L.gmelinii plantation(238.340 mg·m^-2)was greater than natural secondary forest(201.128 mg·m^-2).In the process of vegetation restoration in severely burned areas,there was a significant correlation between CH4 flux and soil temperature(P<0.05).Atmospheric temperature wasn't the main factor affecting soil CH4 flux.There was no significant correlation between atmospheric temperature and CH4 flux.