西安南郊不同深度土壤CO_2浓度变化研究  

Research on CO_2 Density Changes in Different Depth of the Soil in the South Suburb of Xi'an

作　　者：李艳花[1] 赵景波[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062

出　　处：《干旱区资源与环境》2006年第2期124-128,共5页Journal of Arid Land Resources and Environment

基　　金：陕西省自然科学基金项目(2002D02);中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG0411);国际地质对比计划项目(IGCP448)资助

摘　　要：利用红外CO2监测仪对西安南郊不同深度条件下的土壤CO2浓度进行了多次昼夜观测。观测结果表明：在一昼夜内土壤CO2浓度具有从低到高再到低的变化规律，这种变化特点与昼夜温度变化基本一致；上壤CO2浓度从总体来看具有白天高，夜间低，夏季高，秋季低的特点；浅层土壤CO2浓度昼夜变化幅度明显大于深层土壤CO2浓度变化幅度；在厚层黄土的150cm深度范围内，土壤CO2浓度随着深度的增加而增加，在150～600cm深度范围内CO2浓度基本恒定，显示出与薄层土CO2浓度变化明显不同。Use the infrared monitor of CO2 to test the CO2 concentration of the different depth soil in the south suburb of Xi＇an round the clock many times. The results show. The soil CO2 concentration changed from low to high and then to low from the morning to the next morning. The change of soil CO2 concentration coincided with the temperature change, but the change of the former was later than that of the latter. The soil CO2 concentration was higher in day than in night; The soil CO2 concentration was higher in summer than in autumn. The temperature was the main factor determining the change law of the soil CO2 concentration . The soil CO2 concentration of the shallow layer changed greater obviously than that of deep layer during 24h. The soil CO2 concentration grew with the depth of layer till it reached a steady amount in 150cm,which was different from the result of the thin layer.

关 键 词：西安南郊 土壤CO2浓度 变化规律 深度差异 

分 类 号：S153.6[农业科学—土壤学]