The effect of biodiversity on nutrient cycling in an experimental grassland

实验草地生物多样性对养分循环的影响

• 批准号: 5347966
• 负责人: Professor Dr. Wolfgang Wilcke
• 金额: --
• 依托单位: Institut für Geographie und Geoökologie (IFGG)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5347966?language=en
• 关键词: effect; biodiversity; nutrient; cycling; experimental

Species and/or functional diversity of experimental grassland communities may influence the soil nutrient cycle. The objectives of our proposal are (1) to quantify nutrient retention (N, P, K, Ca, Mg, S, Cu, Mn, Zn) by setting up an ecosystem budget including all inputs and outputs, (2) to determine the contribution of organic N, P, and S in soil solution to nutrient cycling, and (3) to assess soil N processes with the help of the N isotope composition in inorganic N species in differently diverse experimental grassland communities. We will collect soil solid phase samples, precipitation above and below the grass canopy, and soil solution with porous suction plates at 10, 20, 30, and 60 cm soil depth in one of the four blocks of the Jena biodiversity experiment and at 30 am depth in two other blocks (66 plots). Dry deposition will be estimated with a chloride tracer method. Nutrient leaching will be assessed with available models in close cooperation with the hydrological subproject. We expect answers to the questions whether increasing species diversity per se or increasing functional diversity result in increasing nutrient use and whether more diverse grassland systems are more stable than less diverse systems as indicated by the balance between nutrient inputs and outputs.

实验草地群落的物种和/或功能多样性可能会影响土壤养分循环。我们提案的目标是（1）通过建立包括所有投入和产出的生态系统预算来量化养分保留（N，P，K，Ca，Mg，S，Cu，Mn，Zn），（2）确定土壤溶液中有机N，P和S对养分循环的贡献，以及（3）借助土壤中无机氮物种中的N同位素组成来评估土壤氮过程。 不同的实验草原群落。我们将在耶拿生物多样性实验的四个区块之一的 10、20、30 和 60 厘米土壤深度以及另外两个区块（66 个地块）的 30 上午深度处使用多孔吸力板收集土壤固相样品、草冠上方和下方的降水以及土壤溶液。将使用氯化物示踪方法来估计干沉积。将与水文子项目密切合作，利用现有模型对养分淋滤进行评估。我们期望得到以下问题的答案：增加物种多样性本身或增加功能多样性是否会增加养分利用，以及养分输入和输出之间的平衡表明，更多样化的草地系统是否比多样化程度较低的系统更稳定。