Drought and recovery effects on belowground respiration dynamics and the partitioning of recent carbon in managed and abandoned grassland.

ABSTRACT: The supply of soil respiration with recent photoassimilates is an important and fast pathway for respiratory loss of carbon (C). To date it is unknown how drought and land-use change interactively influence the dynamics of recent C in soil-respired CO₂ . In an in situ common-garden experiment, we exposed soil-vegetation monoliths from a managed and a nearby abandoned mountain grassland to an experimental drought. Based on two ¹³ CO₂ pulse-labelling campaigns, we traced recently assimilated C in soil respiration during drought, rewetting and early recovery. Independent of grassland management, drought reduced the absolute allocation of recent C to soil respiration. Rewetting triggered a respiration pulse, which was strongly fuelled by C assimilated during dr

SUBMITTER: Ingrisch J 

PROVIDER: S-EPMC7384171 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature