Nutrient dynamics along the litter – mineral soil continuum

沿凋落物的养分动态 â 矿质土壤连续体

• 批准号: 502049264
• 负责人: Professorin Dr. Friederike Lang
• 金额: --
• 依托单位: Professur für Bodenökologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/502049264?language=en
• 关键词: Nutrient; dynamics; along; litter; mineral

Slow turnover of the forest floor (FF) is often assumed to be related to immobilisation of nutrients within the organic matter. This is in contrast to the overall hypotheses of FOR 5315 that thick FF represents some kind of adaptation to low nutrient supply by mineral soils. With our project we investigate under which conditions slow turnover of FF material might be an advantage. Our objective is to determine which processes control the relevance of the FF for tree nutrition as compared to the mineral topsoil. We test the hypotheses that (1) at nutrient poor sites the turnover of C is lower than the turnover of P and N, (2) admixture of minerals to FF material and subsequent biotic formation of SOM-mineral associations decreases the pool of organically bound P+N and of easily mobilisable P+N, and (3) that in Norway spruce (Picea abies), FF will contribute more to N and P uptake than in maple (Acer pseudoplatanus) while beech (Fagus sylvatica) will be more plastic across site types: similar to maple on rich sites, and similar to spruce on poor sites. To test our hypotheses, we will study the mobilization kinetics of the macronutrients from FF and A horizons using soil dialysis, we will apply the novel approach of litter and OF bags with admixture of the respective minerals, and we will analyse the mobilization of N from labelled litter in the mesocosm approach for the three tree species. Installing labelled mesocosms at the controlled conditions of a tree species experiment will complement our analyses. In cooperation with the partners of the RU we will be able to explore the impact of the microbial community, root-mycorrhizal exudates, and soil faunal groups on the mobilisation of nutrients from the FF. Integration all our results, we will provide information on the role of FF for the nutrition of beech, maple and spruce at the different sites and how this is related to the FF morphology. With the synthesis of our project we will contribute to the RU cross cutting question on nutrients. We will know under which conditions and for which tree species longer residence time of nutrients in FF is of benefit.

通常认为森林地板（FF）的流动缓慢与有机物中的养分固定有关。这与5315的总体假设相反，厚的FF代表了矿物质土壤养分供应低的某种适应性。通过我们的项目，我们调查在哪些条件下缓慢的FF材料营业额可能是一个优势。我们的目标是确定哪些过程控制FF与矿物表土相比，FF与树营养的相关性。我们测试了以下假设：（1）在养分贫困部位，C的离职低于P和N的离职率，（2）矿物质到FF材料的混合以及随后的Som-Minalsections的生物形成降低了有机结合的P+N，以及易于动机的P+N和（3）NORDEN SPRUTE（3）ff FF FF的更多n和PIC）。在枫（Acer pseudoplatanus）中，山毛榉（Fagus sylvatica）将更具塑性为跨站点类型：类似于富裕地点上的枫木，类似于较差的地点上的云杉。为了检验我们的假设，我们将研究使用土壤透析的FF和地平线的大量营养素的动员动力学，我们将采用各自矿物质混合的垃圾的新方法和袋子的新方法，我们将分析Mesocosm中垃圾中垃圾中N垃圾的动员N型物种的动员。在树种实验的受控条件下安装标记的中焦将补充我们的分析。在与RU的合作伙伴的合作中，我们将能够探索微生物群落，根 - 菌骨渗出液和土壤动物群对从FF动员营养的影响。整合我们的所有结果，我们将提供有关FF在不同地点在山毛榉，枫木和云杉营养中作用的信息，以及与FF形态有关的信息。随着我们项目的综合，我们将为Ru Cross Cutter Chare oil throun contheriations提供贡献。我们将在FF中的营养物质的哪些条件和较长的住宿时间中知道有益。