Impacts of N/P inputs on organic P dynamics and P status in soils and plants along a nutrient gradient

N/P 输入对沿养分梯度的土壤和植物有机磷动态和磷状态的影响

• 批准号: 241216797
• 负责人: Professorin Dr. Yvonne Oelmann
• 金额: --
• 依托单位: Institut für Pflanzenbauwissenschaften
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/241216797?language=en
• 关键词: Impacts; inputs; organic; dynamics; status

Atmospheric nitrogen (N) deposition has been shown to affect N cycling in forests with feedbacks on the phosphorus (P) cycle. Therefore, the main objective of the 2nd phase of the SPP 1685 priority program is to investigate the importance of soil organic matter turnover on P cycling under environmental change. This will be tested in a common field experiment installed in Lüss and Bad Brückenau studying the effect of N, P and N+P additions on N and P dynamics and forest nutrition. Major effects are expected in Lüss, the P-limited ecosystem, which would eventually shift from a recycling to an acquiring strategy.The objectives of our joint proposal (Group of Plant Nutrition, ETH Zurich; Group of Geoecology, University of Tübingen; Group of Environmental Sensing and Monitoring, FZ Jülich) are to determine which and to which extent soil biological processes in the forest ecosystem are affected by mineral N and P additions and how this further translates into plant nutrition over the three years of the second phase of the SPP 1685. We plan to extend the set of field sites because of the unique opportunity to study the fate of fertilizer-P by radioactive isotopes (P-32, P-33) under outdoor conditions in a forest at the FZ Jülich (intermediate in terms of soil P fractions as compared to Lüss and Bad Brückenau). Our hypotheses are that after mineral fertiliser additions, the distribution of inorganic and organic P forms in soils will change, more in Lüss than in Jülich and Bad Brückenau. The mineralogy and initial P status of the soils will also be determinant factors for the changes. As a result, the source for plant P (and N) nutrition will differ between Lüss, Jülich, and Bad Brückenau. Processes in soil and fluxes in soil and between plants and soil will also be affected in the short term (3 years of the project), most likely because of an increased organic matter turnover. We will use microbiological tools and P-31 NMR analysis together with stable and radioactive isotope techniques. Using these complementary tools we will be able to quantify soil and plant P pools, characterize organic P forms, assess soil microbial community structure harbouring phosphatase genes, quantify fluxes of P between pools in soils and plants, and identify the contribution of different sources for plant nutrition of exemplary forest ecosystems subject to N and P additions.

大气氮（N）沉积已被证明会影响森林中的n循环，并在磷（P）周期中产生反馈。因此，SPP 1685优先计划的第二阶段的主要目标是研究土壤有机物离职率在环境变化下对P循环的重要性。这将在Lüss和BadBrückenau中的一个常见实验实验中进行测试，该实验研究了N，P和N+P添加对N和P动力学以及森林营养的影响。预计在吕斯（Lüss）是P限制的生态系统中，最终将从回收策略转变为收购策略。我们联合提议的目标（植物营养群，苏黎世集团；苏黎世; Eth eth Zurich;地球学，Tübingen大学的地球学组；TübingenUniversity of Tounbingen; Toundrich; fikJülich的环境感应和监测的范围是在该范围内，而森林的范围是范围的，该过程是在该范围内进行的，该过程是范围的。 P添加以及在SPP 1685的第二阶段的三年中如何进一步转化为植物营养。我们计划扩展一组现场地点，因为有独特的机会通过放射性同位素（P-32，p-33）研究肥料-P的命运（p-32，p-33）在户外条件下的户外条件，与fzjülich的森林中（与土壤中的fractiations相比， Brückenau）。我们的假设是，在矿物质添加后，土壤中无机和有机P形式的分布将变化，而在吕斯（Lüss）中，比吉利奇（Jülich）和巴布布鲁克纳（BadBrückenau）的分布要多。土壤的Mineraology和初始P状态也将确定变化的因素。结果，吕斯（Lüss），尤利希（Jülich）和巴布·布鲁克纳（BadBrückenau）的植物P（和N）营养的来源将有所不同。土壤和土壤中的通量以及植物和土壤之间的过程也将在短期内（项目的3年）受到影响，这很可能是由于有机物的周转率增加。我们将使用微生物工具和P-31 NMR分析以及稳定的放射性同位素技术。使用这些互补工具，我们将能够量化土壤和植物P池，表征有机P形式，评估具有磷酸酶基因的土壤微生物社区结构，量化土壤和植物中P之间P的通量，并确定不同来源对受N和P添加的植物植物营养的贡献。