Format

Send to

Choose Destination
See comment in PubMed Commons below
Oecologia. 2010 Jul;163(3):805-13. doi: 10.1007/s00442-010-1569-5. Epub 2010 Feb 19.

Plant species richness regulates soil respiration through changes in productivity.

Author information

1
Nature Conservation and Plant Ecology Group, Wageningen University and Research Centre, Wageningen, The Netherlands. andre.dias@falw.vu.nl

Abstract

Soil respiration is an important pathway of the C cycle. However, it is still poorly understood how changes in plant community diversity can affect this ecosystem process. Here we used a long-term experiment consisting of a gradient of grassland plant species richness to test for effects of diversity on soil respiration. We hypothesized that plant diversity could affect soil respiration in two ways. On the one hand, more diverse plant communities have been shown to promote plant productivity, which could increase soil respiration. On the other hand, the nutrient concentration in the biomass produced has been shown to decrease with diversity, which could counteract the production-induced increase in soil respiration. Our results clearly show that soil respiration increased with species richness. Detailed analysis revealed that this effect was not due to differences in species composition. In general, soil respiration in mixtures was higher than would be expected from the monocultures. Path analysis revealed that species richness predominantly regulates soil respiration through changes in productivity. No evidence supporting the hypothesized negative effect of lower N concentration on soil respiration was found. We conclude that shifts in productivity are the main mechanism by which changes in plant diversity may affect soil respiration.

PMID:
20169454
PMCID:
PMC2886140
DOI:
10.1007/s00442-010-1569-5
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Springer Icon for PubMed Central
    Loading ...
    Support Center