Nitrogen and Phosphorus Cycling

氮磷循环

基本信息

批准号：
172133814
负责人：
Professorin Dr. Yvonne Oelmann
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：
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/172133814?language=en
关键词：
Nitrogen Phosphorus Cycling

项目摘要

Feedbacks of plant diversity on nutrient cycling in soil under grassland e.g., mediated through organic matter input and adapted microbial communities, might occur after an initial period of establishment. In the Jena Experiment, increased C and N storage in soil under highly diverse mixtures resulted in a shift from negative to positive correlations between plant diversity and concentrations of plant-available chemical N species in soil after five years. Simultaneously, the P pool in soil decreased. Up to now, no longer-term observations of the development of biodiversity-soil nutrient pool relationships exist. We propose to elucidate the underlying processes of accumulation and enhanced release of N in soil with time as related to plant diversity i.e., gaseous N deposition, uptake of groundwater by plants, and gross N mineralization, and to continue monitoring the biodiversity-N and P cycling relationships. We will determine NO2-derived N in SOM with a 15NO2-labeling experiment, plant uptake of NO3 - from groundwater with isotopically labeled SeO4 2-, and in-situ gross mineralization with the 15N pool dilution method. We will continue our 8-yr data set of above and belowground water and nutrient fluxes using established rain collectors and suction plates at all plots of the Main Experiment. We mainly contribute to the Tracer Experiment (6.2) and the Main Experiment (6.3) of the proposed research unit but also provide available N and P concentration data to two other experiments (6.1, 6.4).

植物多样性在草原下的养分循环中的反馈，例如，通过有机物输入和改编的微生物群落介导的，可能会在初始建立后发生。在Jena实验中，在高度多样化的混合物下，土壤中的C和N储存增加导致五年后，从植物多样性和植物可用化学N物种的浓度之间的负相关转变为正相关。同时，土壤中的P池减少。到目前为止，还没有对生物多样性土壤营养池关系发展的长期观察。我们建议阐明与植物多样性有关的时间，即气体N沉积，植物吸收地下水以及N矿化的时间，并继续监测生物多样性-N和P循环关系。我们将通过15no2标记的实验确定SOM中的No2衍生的N，即NO3的植物吸收 - 从地下水中，具有同位素标记的SEO4 2--和15N泳池稀释方法的原位矿化矿化。我们将在主要实验的所有图上使用已建立的雨水收集器和吸入板继续我们的8年数据集和地下水和营养通量。我们主要有助于拟议研究单元的示踪剂实验（6.2）和主要实验（6.3），但也为其他两个实验提供了可用的N和P浓度数据（6.1，6.4）。