Impact of modified temperature and precipitation regime on soil microorganisms and carbon cycling in arable soils

改变温度和降水方式对耕地土壤微生物和碳循环的影响

• 批准号: 48637405
• 负责人: Professorin Dr. Ellen Kandeler
• 金额: --
• 依托单位: Fachgebiet Bodenbiologie (310b)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48637405?language=en
• 关键词: Impact; modified; temperature; precipitation; regime

Carbon cycling in terrestrial ecosystems provides a feedback mechanism to climate change by releasing or sequestering additional atmospheric CO2. However, the response of terrestrial carbon cycling to the interactive effects of a changing temperature and precipitation regime is still unclear. This project aims to relate soil organic carbon turnover under a modified climate to microbial abundance, activity and diversity. A field experiment will be established to modify temperature and precipitation on a arable field. First, we will quantify the seasonal variation of carbon mineralisation under changed climatic conditions by applying respiration, enzyme activity and microbial and fungal biomass measurements. Second, we will clarify the interactive effects of a changed litter quality and decomposition activity on litter decomposition. This will be linked to the fungal community structure by extracting, cloning and sequencing fungal DNA. Third, we will trace the litter carbon flux through the fungal and bacterial community by coupling stable isotope techniques with the extraction of bacterial and fungal biomarkers (PLFAs and ergosterol). Overall, this project will provide valuable information on the response of biogeochemical cycles to climate change and therefore will help to improve scenarios of future climate.

陆地生态系统中的碳循环通过释放或封存额外的大气二氧化碳来提供气候变化的反馈机制。然而，陆地碳循环对温度变化和降水状况相互作用的响应仍不清楚。该项目旨在将改良气候下的土壤有机碳周转与微生物丰度、活性和多样性联系起来。将建立田间试验来改变耕地的温度和降水。首先，我们将通过应用呼吸作用、酶活性以及微生物和真菌生物量测量来量化气候条件变化下碳矿化的季节性变化。其次，我们将阐明凋落物质量变化和分解活动对凋落物分解的交互影响。这将通过提取、克隆和测序真菌 DNA 与真菌群落结构联系起来。第三，我们将通过稳定同位素技术与细菌和真菌生物标志物（PLFA 和麦角甾醇）的提取相结合，追踪真菌和细菌群落中的凋落物碳通量。总体而言，该项目将提供有关生物地球化学循环对气候变化的响应的宝贵信息，因此将有助于改善未来气候的情景。