Stabilization of organic matter by layer silikates - quality and turnover of interaction products

这项建议的总体目标是确定碳固存和粘土矿物学之间的定量和定性关系。该项目背后的想法是，长期的化肥枯竭和植物持续的养分去除将导致有机质成分的变化以及粘土矿物组合的变化(主要通过伊利石质材料中的K-枯竭)。这反过来又意味着物理性质以及主要粘土-有机质组合的稳定性的改变。我们打算在短、中和长时间尺度上调查这种变化。我们将使用1902年、1956年和1982年的实验。总的目标将分为以下子目标：a)矿物组合保护能力背后的机制，b)粘土矿物学对稳定化速率的影响，c)覆盖矿物组合如何影响与粘土矿物相关的有机质的比例和类型，d)有没有途径从易降解的有机质池进入通过与粘土矿物相互作用稳定的有机质池，e)哪些转移速率适用于这里。

The overall goal of this proposal is to determine quantitative andqualitative relationships between carbon sequestration and clay mineralogy. The idea behind the project is that a extended period of fertilizer depletion combined with continued nutrient removal through plants will lead to changes in organic matter composition as well as to changes in the clay minerals assemblage (mainly through K-depletion in illitic materials). This in turn implies modifications in the physical properties as well as in the stability of the predominating clay-organic matter associations. We intend to investigate such changes on short, medium and long timescales. We will use experiments dating from 1902, 1956 and 1982. The overall goal will be devided in the following subgoals: a) which are the mechanisms behind the protective capacity of the mineral assemblage, b) what is the influence of clay mineralogy on stabilisation rates, c) how does theclay mineral assemblage influence proportion and type of organic matter associated with clay minerals, d) are there pathways from the pool of easily degradable organic matter into the pool of organic matter, that is stabilized through interaction with clay minerals, e) which rates of transfer are applicable here.