Response of N turnover, DOC production and soil solution fluxes

氮周转、DOC 产生和土壤溶液通量的响应

• 批准号: 5445163
• 负责人: Professor Dr. Werner Borken
• 金额: --
• 依托单位: Lehrstuhl für Bodenökologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5445163?language=en
• 关键词: Response; turnover; DOC; production; soil

Forest and fen soils are frequently subjected to extended drought periods or to lowering of water table during summer. Many biological and chemical processes in soils are affected by water and oxygen availability, but little is known about the consequences of increasing drought periods on annual matter fluxes for these ecosystems. Here, we quantify and evaluate the effects of changes in precipitation and water table on matter fluxes in soil solution of a forest and a fen at the Fichtelgebirge. Particularly, we will focus on the mechanisms and processes beyond the inorganic N and dissolved organic carbon (DOC) fluxes. The 15N dilution technique and the barometric process separation method will be used to determine the gross N mineralisation and gross nitrification in top soil horizons at different stages of the manipulations. Additionally, in-situ net N mineralisation is scheduled at both sites to estimate the potential availability of inorganic N for plant uptake. The field studies will be accompanied by a laboratory study about the effect of soil water content on N transformation at constant temperature. DOC fluxes and the turnover of soil organic carbon will be simulated using the DyDOC model based on the radiocarbon signature of these fractions.

森林和沼泽地土壤在夏季经常遭受长期干旱或地下水位下降。土壤中的许多生物和化学过程都受到水和氧气供应的影响，但人们对干旱期增加对这些生态系统年物质通量的影响知之甚少。在这里，我们量化和评估的降水和地下水位的变化对物质通量的土壤溶液中的森林和沼泽在Fichtelgebirge。特别是，我们将专注于无机氮和溶解有机碳（DOC）通量以外的机制和过程。15N稀释技术和气压过程分离法将用于确定总氮矿化和总硝化作用在不同阶段的操作在表层土壤。此外，在原位净氮矿化计划在两个网站，以估计植物吸收无机氮的潜在可用性。田间研究将伴随着恒温条件下土壤含水量对氮素转化影响的实验室研究。DOC通量和土壤有机碳的周转将使用DyDOC模型的基础上，这些馏分的放射性碳签名进行模拟。

项目成果

Dynamics of dissolved organic 14C in throughfall and soil solution of a Norway spruce forest

• DOI: 10.1007/s10533-010-9526-2
• 发表时间: 2011-11
• 期刊: Biogeochemistry
• 影响因子: 4
• 作者: K. Schulze;W. Borken;E. Matzner

Organic matter dynamics in a temperate forest as influenced by soil frost

• DOI: 10.1002/jpln.201100009
• 发表时间: 2011-10
• 期刊: Journal of Plant Nutrition and Soil Science
• 影响因子: 2.5
• 作者: A. Schmitt;B. Glaser