Quantification and process analysis of biogenic trace gas fluxes

生物微量气体通量的量化和过程分析

• 批准号: 5445029
• 负责人: Professor Dr. Gerhard Gebauer
• 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/5445029?language=en
• 关键词: Quantification; process; analysis; biogenic; trace

Climate models predict prolonged drought periods and extreme rain events for major parts of Central Europe. Biological and chemical processes in soils are affected by the accompanying changes in water and oxygen availability. However, little is known about the effects of extreme meteorological conditions on the annual matter fluxes on ecosystem level. The overall goal of this project is to quantify the effects of drought periods, changes in the water table and subsequent rain events on the exchange of the trace gases CO2, CH4, N2O and NO between soil, vegetation and atmosphere in a forest and wetland ecosystem and to identify the underlying biogenic production and consumption processes. For this goal we will particularly focus on changes in concentration, fluxes and isotopic composition (14C, 13C, 15N and 18O) of CO2, CH4 and N2O in the soil atmosphere and the soil surface. These gases have a great relevance for the atmosphere in terms of the greenhouse effect.

气候模型预测，中欧主要地区将出现长期干旱和极端降雨事件。土壤中的生物和化学过程受到水和氧可用性的相应变化的影响。然而，在生态系统水平上，极端气象条件对年物质通量的影响却知之甚少。该项目的总体目标是量化干旱期、地下水位变化和随后的降雨事件对森林和湿地生态系统中土壤、植被和大气之间微量气体CO2、CH4、N2O和NO交换的影响，并确定潜在的生物生产和消费过程。为此，我们将特别关注土壤大气和土壤表面中CO2，CH4和N2O的浓度，通量和同位素组成（14C，13C，15N和18O）的变化。这些气体在温室效应方面与大气层有很大的关系。

项目成果

Delayed recovery of soil respiration after wetting of dry soil further reduces C losses from a Norway spruce forest soil

• DOI: 10.1029/2009jg000998
• 发表时间: 2009-12
• 期刊: Journal of Geophysical Research
• 作者: J. Muhr;W. Borken