C-in and C-outputs, rates and mechanisms of C-sequestration and C-stabilization of post-agrogenic soils exemplified by Luvisol chronosequences of Russia

直到最近，世界上许多国家的可耕地使用大大减少。俄罗斯是在名单上的国家放弃耕地的顶部。在那里，大多数废弃都发生在落叶林区的淋溶土上。众所周知，后农业土壤表现出高的碳（C）固存潜力，其性质以及土壤有机碳（SOC）稳定和SOC固存的先决条件在向自然发生的发展过程中发生变化。但是，SOC的稳定机制，在C库的变化率，以及与C输入和C输出的关系还没有很好地理解。因此，本研究计划的目的是分析土壤有机碳库的变化过程，土壤有机碳稳定化的机制，微生物群落及其活动的后农业淋溶土的落叶林区的俄罗斯。考虑到这些过程开始和停止的时间点不同，它们不是线性运行的，具有不同放弃时期的时间顺序方法是一种有前途的工具。研究内容包括有机碳储量、有机碳固定、有机碳积累速率、被动碳库的有机碳富集、活性碳和被动碳库中新碳的进入速率、宏观和微观团聚体中有机碳矿化、微生物群落及其活动。研究的进一步重点是通过量化碳输入和碳输出，将这些土壤内部过程整合到更广泛的生态系统中。为了进行评价，还将进行超过时间序列建模时间跨度的SOC储量开发。由于淋溶土是欧亚和美洲温带气候区最广泛的土壤，代表了潜在耕地的主要群体，因此本研究的结果可以转移到世界各地。

Until recently arable land use decreased considerably in many countries of the world. Russia is at the top of the list of countries with abandonments of arable lands. There most abandonment applies to Luvisols of the deciduous forest zone. It is known that post-agrogenic soils show a high carbon(C) sequestration potential and that their properties as well as preconditions for soil organic carbon (SOC) stabilization and SOC sequestration change during development towards the natural occurrence. But mechanisms of SOC stabilization, rates of changes in C pools, and the relation to C input and C output are not well-understood. Hence, this research program aims at analyzing the changing processes of SOC pools, mechanisms of SOC stabilization, and microbial communities and their activities of post-agrogenic Luvisols of the deciduous forest zone of Russia. Given that the processes begin and stop at different points in time, that they do not run linearly a chronosequential approach with distinct periods of abandonment is a promising tool. The investigations cover SOC stocks, SOC sequestration, SOC accumulation rates, SOC enrichment of passive C pool, entering rates of new C into active and passive C pools, SOC mineralization in macro and microaggregate, and microbial communities and their activities. The further focus of the study is the integration of these soil-intern processes into a broader ecosystem context by quantification of C inputs and C outputs. For evaluation the development of the SOC stocks exceeding the time spans of the chronosequences modeling will also be performed. Because Luvisols are the most widespread soils of temperate climate regions of Eurasian and America and represent the major group for potential arable lands, the findings of this study can be transferred to many areas worldwide.