红外加热对大豆生态系统CO_2排放的影响

通过田间试验,采用静态箱-气相色谱法测定CO2排放通量,研究红外加热增加叶面温度对土壤、大豆-土壤系统CO2排放的影响。结果表明,红外加热叶面增温2℃促进了土壤CO2的排放,在鼓粒-成熟期对照与增温的排放通量分别为202.09±28.75、378.34±156.17mg·m-2·h-1,增温处理使CO2排放通量增加了87.21%,但未达到显著水平;增温使土壤CO2累积排放量显著增加了39.96%。对照和增温的大豆-土壤系统呼吸的气温敏感性系数Q10值分别为0.68和2.54,土壤呼吸的土壤温度Q10值分别为4.22和1.68。研究表明,增温能促进土壤CO2排放,增加大豆-土壤系统呼吸的Q10值,降低土壤呼吸的Q10值。研究结果可为气候变化条件下估算区域农田温室气体排放提供一定的科学依据。

Impacts of Infrared Heating on CO2 Emission from Soybean Ecosystem

To investigate the impact of infrared heating on CO2 emission from soil and soybean-soil system, the field experiment was carried out during soybean growing season. CO2 fluxes were measured by static dark chamber-gas chromatograph method. The results showed that infrared beating 2℃ （T）had a positive effect on soil CO2 fluxes,which increased by 87.21% during maturity stage,from 202. 09 ±28.75mg·m-2·h-1 to 378. 34 ±156. 17mg·m-2·h-1 ,but no significant difference was found; T increased significantly the cumulative amount of CO2 from soil by 39. 96%. In addition,tbe Q10 （temperature sensitivity coefficients）for soybean-soil system＇s respiration under the control and T treatments were 0.68 and 2. 54, respectively, while the Q10 for soil respiration were 4.22 and 1.68, respectively. The results suggest that infrared heating may lead to an increase in soil CO2 emission and the Ql0 for soybean-soil system＇s respiration, and a decrease in the Ql0 for soil respiration. This study will provide the base to estimate the regional farmland greenhouse gas emission.