Ma Xiu-Zhi, Zhang Qiu-Liang, Li Chang-Sheng, Chen Gao-Wa, Wang Fei
College of Forestry, Inner Mongolia Agricultural University, Huhhot 010018, China.
Ying Yong Sheng Tai Xue Bao. 2012 Aug;23(8):2149-56.
By using static chamber-gas chromatograph technique, an in situ measurement was conducted on the soil CH4, CO2, and N2O fluxes in a cold-temperate Larix gmelinii forest in Inner Mongolia from June to September 2007, aimed to understand the diurnal and seasonal variations of soil greenhouse gasses fluxes and their relations with the associated environmental factors in L. gmelinii forests in cold-temperate zone. In growth season, the soil in the L. gmelinii forest was the sink of atmospheric CH4, with the flux ranged from 22.3 to 107.8 microg CH4-C x m(-2) x h(-1). The mean monthly uptake of CH4 in June, July, August, and September was 34.0 +/- 7.1, 71.4 +/- 9.4, 86.3 +/- 7.9, and 40.7 +/- 6.2 microg x m(-2) x h(-1), respectively. The mean diurnal flux of soil CH4 from June to September showed the same variation trend, i. e., peaked at 10:00 am. The diurnal variation of soil CO2 flux showed an obvious double-peak, and the mean monthly CO2 flux was in the order of July > August > June > September. Soil N2O flux varied dramatically from -9.1 to 31.7 microg x m(-2) x h(-1). Soil temperature and humidity were the main factors affecting the CH4 and CO2 fluxes, and soil temperature mainly affected the N2O flux. In the L. gmelinii forest, the CH4, CO2, and N2O fluxes measured at 10:00 am could represent the diurnal CH4, CO2, and N2O fluxes on the same day.
利用静态箱-气相色谱技术，于2007年6月至9月对内蒙古寒温带兴安落叶松林土壤CH₄、CO₂和N₂O通量进行了原位测定，旨在了解寒温带兴安落叶松林土壤温室气体通量的日变化和季节变化及其与相关环境因子的关系。在生长季节，兴安落叶松林土壤是大气CH₄的汇，通量范围为22.3至107.8 μg CH₄-C·m⁻²·h⁻¹。6月、7月、8月和9月CH₄的月平均吸收量分别为34.0±7.1、71.4±9.4、86.3±7.9和40.7±6.2 μg·m⁻²·h⁻¹。6月至9月土壤CH₄的日平均通量呈现相同的变化趋势，即在上午10:00达到峰值。土壤CO₂通量的日变化呈现明显的双峰，月平均CO₂通量顺序为7月>8月>6月>9月。土壤N₂O通量变化幅度较大，为-9.1至31.7 μg·m⁻²·h⁻¹。土壤温度和湿度是影响CH₄和CO₂通量的主要因素，土壤温度主要影响N₂O通量。在兴安落叶松林中，上午10:00测定得到的CH₄、CO₂和N₂O通量可代表同一天的日CH₄、CO₂和N₂O通量。
