Interrelations between soil respiration and its thermal stability
Interrelations between soil respiration and its thermal stability
复制标题
土壤呼吸与其热稳定性之间的相互关系
DOI：
10.1007/s10973-011-2099-z
复制
发表时间：
2012
影响因子：
4.4
通讯作者：
J. Kučerík
中科院分区：
文献类型：
--
作者：
C. Siewert;M. S. Demyan;J. Kučerík
土壤有机质的生物转化是影响全球碳循环的重要因素。为了了解这些复杂的过程，必须结合各种方法对土壤进行研究。本研究比较了在80天的实验室培养过程中，通过CO2的演变确定的土壤有机质（SOM）的生物矿化动力学与热重法（TG）确定的热氧化稳定性。研究了33个土壤样本，这些样本来自德国各个国家公园的各种地质和植被条件。结果表明，在100 °C左右发生的空气干燥的调理土壤的呼吸CO2的量和速率与热质量损失之间存在相关性，线性决定系数高达R2 = 0.85。此外，土壤呼吸与260 °C左右热质量损失的相关性证实了以前的观察结果。从孵育和非孵育土壤的TG配置文件的比较强调了在这两个温度区间的热质量损失的重要性。培养的土壤在240 °C以上热质量损失减少，相反在100-120 °C质量损失增加。此外，通过TG可以准确地测定土壤的有机碳含量等土壤性质，并证明了它可以适用于更广泛的碳含量范围。得出的结论是，热分析的结果可能是一个有用的起点，估计土壤呼吸和开发的方法揭示过程中的土壤。
Biological transformation of organic matter in soil is a crucial factor affecting the global carbon cycle. In order to understand these complex processes, soils must be investigated by a combination of various methods. This study compares the dynamics of biological mineralization of soil organic matter (SOM) determined via CO2 evolution during an 80-day laboratory incubation with their thermo-oxidative stability determined by thermogravimetry (TG). Thirty-three soil samples, originating from a wide range of geological and vegetation conditions from various German national parks were studied. The results showed a correlation between the amount and rate of respired CO2 and thermal mass losses of air-dried, conditioned soils occurring around 100 °C with linear coefficients of determination up to R2 = 0.85. Further, correlation of soil respiration with thermal mass losses around 260 °C confirmed previous observations. The comparison of TG profiles from incubated and non-incubated soils underlined the importance of thermal mass losses in these two temperature intervals. Incubated soils had reduced thermal mass losses above 240 °C and conversely an increased mass loss at 100–120 °C. Furthermore, the accurate determination of soil properties by TG such as soil organic carbon content was confirmed, and it was shown that it can be applied to a wider range of carbon contents as was previously thought. It was concluded that results of thermal analysis could be a helpful starting point for estimation of soil respiration and for development of methods revealing processes in soils.