Microorganisms responsible for a priming effect on peatland DOC decomposition induced by root exudates: an incubation study. Peat DOC microbial community

In this study, we incubated peatland water with original recalcitrant DOC under laboratory conditions together with a mixture of organic compounds simulating root exudate input. The exudate addition differed in quantity (2 % or 5 % of present DOC) and in the C/N stoichiometry (C/N ratios 7, 25, 50) simulating different scenarios of root exudation of peatland plant species during vegetation season. We aimed to (i) evaluate the effect of root exudates on recalcitrant DOC decomposition with focus on its dynamics and resulting priming effect and (ii) identify the microorganisms responsible for this process.

本研究在实验室条件下，将泥炭地水体与原始难降解溶解有机碳（recalcitrant DOC）共同孵育，并添加模拟根系分泌物输入的有机混合物。本次实验中，根系分泌物添加量设置为现有溶解有机碳的2%或5%，且碳氮化学计量比（C/N stoichiometry）分别为7、25、50，以模拟泥炭地植物物种在生长季的不同根系分泌物释放情景。本研究的目标为：(i) 评估根系分泌物对难降解溶解有机碳分解的影响，重点关注其动态变化及由此产生的激发效应；(ii) 明确参与该分解过程的微生物类群。