摘要
为研究土壤呼吸的物理过程及真呼吸,通过对土壤呼吸产生和传输的物理过程分析,根据质量守恒定律,考虑扩散和对流作用对土壤CO2传输的影响,建立土壤CO2传输物理模型,在两个研究样地上进行模型的应用。结果表明,该模型的模拟结果较好地体现了土壤真呼吸及其昼夜、月际变化;各次观测各种处理真呼吸的昼夜变化特征体现了林地土壤自养及异养呼吸的昼夜变化特征,土壤CO2排放通量与真呼吸的差值很小;观测期内两林地土壤表面CO2排放通量均值均小于真呼吸均值,表明在春、夏和秋三个季节土壤CO2表现为积累的过程。本文的研究结果对于研究土壤呼吸本质问题具有重要意义。
By analysis of soil respiration production and its transmission physical process,according to the laws of conservation of mass and taking into account the diffusion and convection,the model of soil CO2 transmission physical process is established. The results of model application in two study samples showed that,the simulation results of the model better reflected the true respiration and its diurnal and monthly change. Diurnal variation of each observation of various breathing process reflects the diurnal variation of soil autotrophic and heterotrophic respiration,and the difference of soil CO2 discharge flux and breathing is very small; two soil surface CO2 flux in the observation period is less than the true mean respiratory mean,indicating soil CO2 accumulation in the spring,summer and winter. The results of this study have important significance for the study of soil respiration in nature.
出处
《森林工程》
2014年第5期11-17,共7页
Forest Engineering
基金
黑龙江省教育厅科学技术研究项目(11553035)
关键词
土壤呼吸
物理过程
真呼吸
soil respiration
physical process
true respiration
