Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 566, Issue -, Pages 215-222Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.05.008
Keywords
biodiversity-ecosystem functioning; global change; climate change; plant functional groups; carbon isotopes; delta C-13
Categories
Ask authors/readers for more resources
Land-use change and intensification play a key role in the current biodiversity crisis. The resulting species loss can have severe effects on ecosystem functions and services, thereby increasing ecosystem vulnerability to climate change. We explored whether land-use intensification (i.e. fertilization intensity), plant diversity and other potentially confounding environmental factors may be significantly related to water use (i.e. drought stress) of grassland plants. Drought stress was assessed using delta C-13 abundances in aboveground plant biomass of 150 grassland plots across a gradient of land-use intensity. Underwater shortage, plants are forced to increasingly take up the heavier C-13 due to closing stomata leading to an enrichment of C-13 in biomass. Plants were sampled at the community level and for single species, which belong to three different functional groups (one grass, one herb, two legumes). Results show that plant diversity was significantly related to the delta C-13 signal in community, grass and legume biomass indicating that drought stress was lower under higher diversity, although this relation was not significant for the herb species under study. Fertilization, in turn, mostly increased drought stress as indicated by more positive delta C-13 values. This effect was mostly indirect by decreasing plant diversity. In line with these results, we found similar patterns in the delta C-13 signal of the organic matter in the topsoil, indicating a long history of these processes. Our study provided strong indication for a positive biodiversity-ecosystem functioning relationship with reduced drought stress at higher plant diversity. However, it also underlined a negative reinforcing situation: as land-use intensification decreases plant diversity in grasslands, this might subsequently increases drought sensitivity. Vice-versa, enhancing plant diversity in species-poor agricultural grasslands may moderate negative effects of future climate change. (C) 2016 Elsevier B.V. All rights reserved.
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