水、热对土壤CO2排放影响的研究

为了研究旱地土壤CO2产生与排放的特征以及水热等因素对其的影响，在甘肃省马铃薯大田内，采用静态箱-气相色谱法检测CO2排放通量，同时观测了土壤5，10，15，20，25 cm深度处的CO2浓度，研究不同灌水、覆膜方式下水、热因素对CO2排放的影响。结果表明：灌水后，CO2产生和排放量显著增加；在24 h内，CO2通量以及土壤中CO2浓度日变化因受到气温的影响而呈现出明显的昼高夜低趋势；灌水周期内，水分为影响CO2产生和排放的主要因素，CO2通量和土壤不同深度处浓度随着土壤水分的降低总体呈下降趋势。

Study on the Influence of Water and Temperature on Soil CO2 Emission

The potato field experiment was conducted at Shiyang River Experimental Station for Water-saving in Agriculture and Ecology of China Agrieuhural University located in Wuwei City, Gansu Province in 2010. In this experiment, the static opaque chamber-gas chromatograph method was used to simultaneously measure CO2 fluxes and concentration in the depths of 5, 10, 15, 20, 25 cm in soil to study the effects of water and temperture on CO2 emission under different irrigation or mulch. The results were as follows： after irrigation, CO2 emission flux and concentration was significantly increased. In 24 hours, because of the influence of temperature, CO2 emission flux and concentration from different depths of soil presented a high trend in the day and low in the night. In the irrigation period, water was the most important influencing factor of CO2 production and emission, CO2 emission flux and concentration from different depths of soil decreased with water content.