Tree species effects on the release of dissolved organic carbon and nitrogen from decomposing logs

树种对分解原木释放溶解有机碳和氮的影响

• 批准号: 193231558
• 负责人: Professor Dr. Egbert Matzner
• 金额: --
• 依托单位: Lehrstuhl für Bodenökologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/193231558?language=en
• 关键词: Tree; species; effects; release; dissolved

The release of dissolved organic matter (DOM) from decomposing logs might be a significant contribution to their mass loss and an important C input to the soil underneath the logs. Here we will contribute to the BeLongDead initiative by investigating concentrations, properties and fluxes of DOM as influenced by tree species, forest management, climatic conditions and time of log exposure. Furthermore we will follow the fluxes of mineral N and establish DOM and N budgets of the logs by comparing throughfall fluxes and fluxes with runoff from the logs. The runoff water from the logs will be collected periodically at selected sites using small gutters placed underneath the logs. In total, runoff water from 120 logs will be sampled. All 13 tree species will be studied in the Hainich sites, while at Schorfheide and Schwäbische Alb sites only beech, spruce and oak logs are compared. The elemental composition of DOM (C, N), its spectroscopic properties and 13C signatures will be determined. In addition, the mineralization of DOM to CO2 by soil organisms is investigated in laboratory incubations. In cooperation with the other members of we will be able to achieve ground braking progress on the processes driving the decomposition of logs, the related DOM release and N turnover as influenced by tree species, wood properties, climate, insect and fungi invasion.

原木分解过程中释放的溶解性有机质（DOM）可能是原木质量损失的重要原因，也是原木下土壤重要的碳输入。在这里，我们将通过调查DOM的浓度，属性和通量的影响树种，森林管理，气候条件和时间的日志曝光的BeLongDead倡议作出贡献。此外，我们将跟踪矿质氮的通量，并通过比较穿透水通量和径流通量的日志建立DOM和N的预算。将在选定的地点使用放置在原木下面的小水槽定期收集原木的径流水。总共将对120根原木的径流水进行采样。将在Hainich站点研究所有13个树种，而在Schorfheide和Schwäbische Alb站点仅比较山毛榉、云杉和橡树原木。DOM（C，N）的元素组成，其光谱特性和13 C签名将被确定。此外，在实验室培养的DOM矿化为CO2的土壤生物进行了研究。通过与其他成员的合作，我们将能够在推动原木分解的过程中取得地面制动进展，相关的DOM释放和N周转受到树种，木材特性，气候，昆虫和真菌入侵的影响。