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Organic matter stabilisation during paddy soil development depending on soil type

稻田土壤发育过程中有机质的稳定性取决于土壤类型

基本信息

批准号：
60208804
负责人：
Professorin Dr. Ingrid Kögel-Knabner
金额：
--
依托单位：
Institute of Soil Science
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/60208804?language=en
关键词：
Organic matter stabilisation during paddy

项目摘要

The aim of project is to identify the role of microaggregation, organo-mineral complexes, and charred organic carbon for the stabilisation of organic carbon in paddy soils. A method consisting of a combination of physical (particle-size and density) and chemical fractionation methods will be adapted to each soil type specifically to isolate aggregates and organo-mineral complexes in soil-type specific soil organic matter (SOM) fractions. The isolated fractions will then be analyzed for the chemical composition of the organic matter by solid-state 13C NMR spectroscopy and specifically for the hydrolysable carbohydrate content by GC-MS. The age of the stable organic matter in selected fractions will be assessed by radiocarbon analysis. The organo-mineral associations will be characterized by selective or total removal of minerals and organic substances in combination with analysis of specific surface area. Soil fractions will be investigated by SEM and NanoSIMS to elucidate the composition of microaggregates and organo-mineral complexes. This will enable us to understand the influence of the parent soil type on aggregation and soil organic carbon stabilisation in dependence of e.g. type and content of iron oxides, and to evaluate the contribution of the different SOM stabilisation processes during paddy soil formation.

该项目的目的是确定微团聚体，有机无机复合物，和烧焦的有机碳的作用，在稻田土壤中的有机碳的稳定。一种由物理（颗粒大小和密度）和化学分级方法相结合的方法将适用于每种土壤类型，特别是分离土壤类型特定土壤有机质（SOM）组分中的团聚体和有机无机复合物。然后将通过固态13 C NMR光谱分析分离的馏分的有机物的化学组成，并通过GC-MS特别分析可水解碳水化合物的含量。将通过放射性碳分析评估选定馏分中稳定有机物的年龄。有机-矿物组合的特征是矿物和有机物质的选择性或全部去除，并结合比表面积分析。将通过SEM和NanoSIMS研究土壤组分，以阐明微团聚体和有机无机复合物的组成。这将使我们能够了解的聚集和土壤有机碳的稳定依赖于例如铁氧化物的类型和含量的母质土壤类型的影响，并评估在水稻土形成过程中的不同SOM稳定过程的贡献。