Surficial processes and CO2 flux in soil ecosystem

摘要: Abstract Global warming as a result of rising levels atmospheric CO 2 concentration has become an issue increasing environmental concerns. This study is to estimate the role surficial processes, including solar radiation, air temperature, relative humidity, rainfall, soil water movement and heat flux, respiration, on diffusive flux into atmosphere from ecosystem. An existing one-dimensional mathematical model for simultaneous transport water, heat, through unsaturated modified purpose this study. Two simulation scenarios (i.e. daily monthly) are performed Simulation results show that processes have decisive effects Of examined in study, radiation one most important processes. It governs cycles temperature evaporation, which turn controls production rates, thereby atmosphere. Rainfall another process monthly flux. determines content available biological respiration air-filled pore spaces Daily rate similar those surface but overall magnitude decreases consecutively response increase content. Soil controlled by both As decreases, expected decrease. The pattern more or less during day decreasing night), over time. variations driven whereas due immediately beneath surface. suggests play ultimate