Biological nitrogen fixation and concentrations of nutrients and non-structural carbohydrates in deadwood of 13 different tree species

Deadwood is an extremely nitrogen poor plant litter whose decomposition may rely on external nitrogen sources. Biological nitrogen fixation by free-living diazotrophs is a potential pathway of nitrogen acquisition in deadwood. Still, the control of this process by tree species specific traits is hardly known.We determined rates of biological nitrogen fixation, respiration rate, and concentrations of nutrients and non-structural carbohydrates in deadwood logs of the BELongDead project from 13 tree species in the Hainich-Dün region of the Biodiversity Exploratories in June 2020. The data collection and analysis was part of the project Woodstock within the framework of the DFG-funded joint project Biodiversity Exploratories (https://www.biodiversity-exploratories.de).枯木（Deadwood）是一类极度缺乏氮素的植物残体，其分解过程可能依赖外源氮源。自生固氮菌（free-living diazotrophs）介导的生物固氮作用，是枯木获取氮素的潜在途径之一，但目前关于树种特异性性状对该过程的调控机制仍知之甚少。本研究于2020年6月，在德国生物多样性探索计划（Biodiversity Exploratories）的海尼希-杜恩（Hainich-Dün）区域，针对BELongDead项目中13个树种的枯木原木，测定了其生物固氮速率、呼吸速率及养分与非结构性碳水化合物的浓度。本研究的数据采集与分析工作，隶属于德国研究基金会（Deutsche Forschungsgemeinschaft, DFG）资助的联合项目“生物多样性探索计划”框架下的Woodstock项目，项目详情可访问：https://www.biodiversity-exploratories.de。