多通道土壤呼吸长期自动测量系统的集成与性能测试

Integration and Performance Test of an Automatic Multi-channel Long-term Soil Respiration Measurement System

全球气候变化已成为公众和科学界关注的热点。CO2作为一种重要的温室气体,其源、汇及通量的精确测定备受重视。全世界范围土壤呼吸高达80．4PgC·a^-1，仅次于海洋释放到大气的CO2通量，

On the basis of international research of soil respiration monitoring technology,an automatic eight-channel long-term soil respiration measurement system was developed by integrating dynamic chamber and infrared gas analyzer.The reliability of the automatic multi-channel chamber system was comparatively tested with LI-8100 in a Robinia pseudoacacia stand at the Xiaolangdi Forest Ecosystem Research Station.The results showed that：The air-tightness,stability and reliability of this system meet the design requirements.The system was able to be used to make automatic,continuous and multi-points measurements that were influenced in significanthy by natural environments.The tendency of diurnal variation of soil respiration rate tested by the automatic multi-channel chamber system was similar with that measured by LI-8100,The measured results of different chambers still had differences.It＇s possibly due to spatial heterogeneity of soil respiration.