Journal
ECOSYSTEMS
Volume 21, Issue 4, Pages 689-703Publisher
SPRINGER
DOI: 10.1007/s10021-017-0178-0
Keywords
Carbon cycle; Climate extreme; Gross primary productivity; Land-use change; Nitrogen; Recovery; Resilience; Resistance; N-15 labelling
Categories
Funding
- Medical University of Innsbruck
- Austrian Science Fund (FWF) [I 1056]
- German Federal Ministry of Education and Research (BMBF) [01LC1203A]
- STSM of the COST Action STReESS [PF1106]
- FPU from the Ministerio de Educacion, Cultura y Deporte, Spain
- CLIMLUC ('Climate extremes and land use change-effects on ecosystem processes and services) - Austrian Academy of Sciences
- University of Innsbruck
Ask authors/readers for more resources
Climate extremes and land-use changes can have major impacts on the carbon cycle of ecosystems. Their combined effects have rarely been tested. We studied whether and how the abandonment of traditionally managed mountain grassland changes the resilience of carbon dynamics to drought. In an in situ common garden experiment located in a subalpine meadow in the Austrian Central Alps, we exposed intact ecosystem monoliths from a managed and an abandoned mountain grassland to an experimental early-summer drought and measured the responses of gross primary productivity, ecosystem respiration, phytomass and its components, and of leaf area index during the drought and the subsequent recovery period. Across all these parameters, the managed grassland was more strongly affected by drought and recovered faster than the abandoned grassland. A bivariate representation of resilience confirmed an inverse relationship of resistance and recovery; thus, low resistance was related to high recovery from drought and vice versa. In consequence, the overall perturbation of the carbon cycle caused by drought was larger in the managed than the abandoned grassland. The faster recovery of carbon dynamics from drought in the managed grassland was associated with a significantly higher uptake of nitrogen from soil. Furthermore, in both grasslands leaf nitrogen concentrations were enhanced after drought and likely reflected drought-induced increases in nitrogen availability. Our study shows that ongoing and future land-use changes have the potential to profoundly alter the impacts of climate extremes on grassland carbon dynamics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available