Linking biological drivers and water transport to understand biodiversity effects on C and N storage in soils

将生物驱动因素和水运输联系起来，了解生物多样性对土壤碳和氮储存的影响

• 批准号: 289474429
• 负责人: Professor Dr. Gerd Gleixner
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289474429?language=en
• 关键词: Linking; biological; drivers; water; transport

The need for long term observations and experiments in biodiversity research has been emphasized to better understand biodiversity ecosystem functioning (BEF) relationships. This is particular true for slowly reacting systems, such as soil and even more when investigating processes driving element dynamics in sub soils. The proposed project will therefore investigate the effect of plant diversity and composition on organic matter changes in sub soils (deeper than 40 cm) ten years after establishing the experiment. We explore the coupling of C and N soil dynamics with the water cycle in order to reveal the underlying mechanisms governing plant diversity effects on nitrogen gains, losses and redistribution along a soil depth profile. Besides understanding deeper soil processes, this work will also contribute to understand why N accumulates in the topsoil of the non fertilized Jena Experiment. Finally, in close cooperation with the other newly formed subprojects, we will explore the positive BEF relationship for soil related processes to investigate not only the effect of plant diversity on element cycles but also the shift of the related drivers over time. The last point will be strongly supported by the insights derived from the Determinants of LongTerm Biodiversity Effects on Ecosystem Functioning (DeLT BEF) Experiment, where we determine soil carbon and nitrogen stocks and storage, and soil moisture patterns in soils having different soil history.

为了更好地理解生物多样性生态系统功能（BEF）之间的关系，生物多样性研究需要长期的观测和实验。对于缓慢反应的系统尤其如此，例如土壤，甚至在研究地下土壤中驱动元素动力学的过程时更是如此。因此，拟议的项目将在建立实验十年后研究植物多样性和组成对下层土壤（深度超过40厘米）有机质变化的影响。为了揭示植物多样性对土壤深度剖面氮素收益、损失和再分配影响的潜在机制，我们探索了土壤碳氮动态与水循环的耦合。除了了解更深层次的土壤过程，这项工作还将有助于理解为什么氮在未施肥的耶拿试验的表土中积累。最后，我们将与其他新成立的子项目密切合作，探索土壤相关过程的正BEF关系，不仅研究植物多样性对元素循环的影响，而且研究相关驱动因素随时间的变化。最后一点将得到来自生态系统功能长期生物多样性影响决定因素（DeLT BEF）实验的见解的有力支持，在该实验中，我们确定了具有不同土壤历史的土壤中的土壤碳和氮储量以及土壤水分模式。