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采用静态箱/气相色谱(GC)法,对寒温带兴安落叶松林区6—9月生长季土壤CO2、CH4和N2O通量进行原位测定,研究了土壤温室气体通量的季节和昼夜变化及其与环境因子的关系.结果表明:在生长季,兴安落叶松林土壤为大气CH4的汇,吸收通量为22.3～107.8μgCH4-C.m-2.h-1,6—9月月均甲烷吸收通量为(34.0±7.1)、(71.4±9.4)、(86.3±7.9)和(40.7±6.2)μg.m-2.h-1;不同季节土壤CH4昼夜通量的变化规律相同,一天中均在10:00达到最大吸收高峰.土壤CO2日通量呈明显的双峰曲线,月均CO2通量大小顺序为7月>8月>6月>9月.土壤N2O通量变异较大,在-9.1～31.7μg.m-2.h-1之间.土壤温度和湿度是影响CO2和CH4通量的重要因子,N2O通量主要受温度的影响.在兴安落叶松林区,10:00左右观测获得的温室气体地-气交换通量,经矫正后可以代表当日气体通量.
The CO2, CH4 and N2O fluxes in the growing season of Larix gmelinii forest in the cold temperate zone were measured by static box / gas chromatography (GC) method. The seasonal and diurnal changes of greenhouse gas flux were studied. The results showed that in the growing season, the soil of Larix gmelinii forest was the sink of CH4, and the absorption flux was 22.3 ~ 107.8μg CH4-Cm-2.h-1, 6-9 month (34.0 ± 7.1), (71.4 ± 9.4), (86.3 ± 7.9) and (40.7 ± 6.2) μg.m-2.h-1, respectively. The daily flux of CH4 in different seasons varied in the same way. The maximum absorption peak was reached at 10:00, and the soil CO2 diurnal variation showed the trend of the two terminal curves, the average monthly flux of CO2 was in the order of July> August> June> September. -9.1 ~ 31.7μg.m-2.h-1 soil temperature and humidity are important factors affecting the flux of CO2 and CH4, N2O flux is mainly affected by temperature in Larix gmelinii forest area around 10: 00 Observed greenhouse gas-to-air exchange flux, corrected to represent the same day the gas flux.