Phosphorus cycling in grasslands and forests of differing diversity and land use

不同多样性和土地利用的草原和森林中的磷循环

• 批准号: 60966032
• 负责人: Professorin Dr. Yvonne Oelmann
• 金额: --
• 依托单位: Arbeitsgruppe Geoökologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/60966032?language=en
• 关键词: Phosphorus; cycling; grasslands; forests; differing

Increasingly efficient nutrient exploitation with increasing plant diversity results in lower nutrient concentrations in soil solution. This has been shown for N but not for other important nutrients such as P. In managed ecosystems, diversity is closely linked to land-use intensity and history. To understand the controls of nutrient concentrations in soil the land-use and biodiversity effects must be disentangled. Therefore, we propose to study the effect of land use and biodiversity on P cycling in grassland and forest systems of the three biodiversity exploratories. Our objective is to disentangle the effect of land use and plant diversity on 1) P in soil (total, inorganic, and organic), 2) P release in soil (dissolution of P minerals and mineralization of organic matter), and 3) P in plants in all intensively studied subplots of each exploratory (grasslands and forests). Furthermore, we will assess the influence of land-use practices on P in soil by using novel isotope techniques, i.e. the determination of d18O in phosphates. We will determine P pools in soil and plant biomass, P release by dissolution and mineralization, and the isotopic signature (d18O) in phosphate extracted from soil.

随着植物多样性的增加，越来越有效的养分利用会导致土壤溶液中的养分浓度较低。这已显示为N，但没有针对其他重要营养素（例如P.）的生态系统，多样性与土地利用强度和历史密切相关。要了解土壤中养分浓度的控制，土地利用和生物多样性效应必须分解。因此，我们建议研究三种生物多样性探索者的草原和森林系统中土地使用和生物多样性的影响。我们的目标是消除土地使用和植物多样性对1）土壤中P的影响（总，无机和有机物），2）P中释放（P矿物质的溶解和有机物的矿化），以及3）P中的所有深入研究的植物中，每个探索性的探索性（草地和森林）中的所有深入研究。此外，我们将通过使用新型同位素技术（即确定磷酸盐中的D18O的测定）来评估土壤中P对土壤中P的影响。我们将确定土壤和植物生物量中的P池，通过溶解和矿化释放P，以及从土壤中提取的磷酸盐中的同位素特征（D18O）。