陆地生态系统土壤呼吸时空变异的影响因素研究进展

土壤呼吸是碳循环中的1个重要过程,土壤呼吸作用的过程及其影响因子对理解陆地碳循环极为关键.本文对迄今为止国内外关于土壤呼吸时空变异性影响因素的一些研究进行综述,分析了气候、植被、土壤因素对土壤呼吸变异性的影响规律.以往的研究表明,气候因素中对土壤呼吸具有重要影响的因子为气温和降水,植被因素中对土壤呼吸具有重要影响的因子...

Review of the Factors Influencing the Temporal and Spatial Variability of Soil Respiration in Terrestrial Ecosystem

Soil respiration is an important process in carbon cycling. Understanding the processes and controlling factors of soil respiration are crucial in investigating the terrestrial carbon cycling. This article reviews the investigations about the factors controlling the temporal and spatial variability of soil respiration. The temporal and spatial variability in soil respiration is linked with climate, vegetation and soil factors. Air temperature and precipitation generally contribute great to the variability of soil respiration. Leaf area index (LAI), litter fall and fine root biomass are three plant-related factors that can be employed to explained the variability of soil respiration, while soil carbon content and texture are two soil factors responsible for the variability of soil respiration. Generally, climate, vegetation and soil factors contribute collectively to the temporal and spatial variability of terrestrial soil respiration. Temperature and precipitation, on the one hand, directly affect the root and microbial respiration rates. On the other hand, temperature and precipitation indirectly affect soil respiration by influencing the plant and microbial growth and soil conditions. In order to understand the controlling factors of the temporal and spatial variability of soil respiration, there are four main issues need to be addressed. The issues include quantitatively partitioning the autotrophic and heterotrophic components of soil respiration, standardizing the method and scale of measuring soil respiration, coupling measurements of soil respiration with environmental factors and performing more measurements of soil respiration in wetland ecosystems.