Soil organic matter storage as a function of plant biodiversity

土壤有机质储存作为植物生物多样性的函数

• 批准号: 172133448
• 负责人: Professor Dr. Gerd Gleixner
• 金额: --
• 依托单位: Max-Planck-Institut für Biogeochemie (MPI-BGC)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/172133448?language=en
• 关键词: Soil; organic; matter; storage; function

Over the last years of the Jena Experiment, we have observed a significant positive relationship between plant biodiversity and carbon storage in soils on the one hand and plant biomass production on the other hand. Most interestingly, plant biodiversity per se was more important for the observed increase in soil carbon than plant biomass inputs. The mechanisms behind this unexpected result, however, are still unclear. We therefore suggest identifying the underlying processes. At first we will compare the measured total soil carbon stock changes with newly formed soil organic matter based on 14C isotope mass balances. This approach will quantify the effect of biodiversity on the decomposition of inherited carbon older then the experiment. In a second independent approach, we will determine chemical markers of input material, stored soil carbon and exported dissolved carbon from all biodiversity levels to draw conclusions on the quality and hence the origin and turnover of stored soil carbon. In a stepwise approach of chemical methods, we will identify root related markers like lignin, cellulose or lipids and microbial markers like proteins or phospholipids and study the storage processes. Finally we will use the joint labelling experiment at the ECOTRON facility to trace the flow of labelled CO2 and NOx into soil microorganisms and soil organic matter. The use of independent labels will allow to distinct between uptake and storage related processes from decomposition processes.

在耶拿实验的最后几年里，我们观察到植物生物多样性和土壤碳储量与植物生物量生产之间存在显著的正相关关系。最有趣的是，对于观察到的土壤碳增加，植物生物多样性本身比植物生物量投入更重要。然而，这一意想不到的结果背后的机制仍不清楚。因此，我们建议确定基本进程。首先，我们将根据14C同位素质量平衡，将测得的土壤总碳库变化与新形成的土壤有机质进行比较。这一方法将量化生物多样性对比实验更古老的遗传碳分解的影响。在第二种独立的方法中，我们将确定所有生物多样性水平的输入材料、储存的土壤碳和输出的溶解碳的化学标记，以得出关于储存的土壤碳的质量以及由此产生的来源和周转的结论。在化学方法的逐步方法中，我们将识别与根相关的标记，如木质素、纤维素或脂类，以及微生物标记，如蛋白质或磷脂，并研究其储存过程。最后，我们将使用ECOTRON设施的联合标记实验来追踪标记的二氧化碳和NOx进入土壤微生物和土壤有机质的流动。使用独立的标签可以将与吸收和储存相关的过程与分解过程区分开来。