Hierarchical reliability in experimental plant assemblages

作者：Flynn Dan F B^*; Schmid Bernhard; He Jin Sheng; Wolfe Bellin Kelly S; Bazzaz F A

来源：Journal of Plant Ecology-UK, 2008, 1(1): 59-65.

DOI：10.1093/jpe/rtm004

• ecosystem reliability
• species richness
• community density
• functional group
• ecosystem functioning

Aims
The mechanism by which species richness affects variation in ecosystem functioning both within and among ecosystems remains a key question at the interface of community and ecosystem ecology. Statistical averaging (the smoothing of average system performance via consideration of additional components) and the insurance effect (reduced variation in system performance by inclusion of asynchronously varying components) predict that more diverse communities should vary less both between replicates and internally. We experimentally tested these theories in small plant assemblages.
Methods
We constructed plant assemblages modeled after old-field plant communities. We varied species richness, species composition and initial densities while holding functional group richness constant in replicate assemblages under glasshouse conditions.
Important findings
The inverse of the coefficient of variation of aboveground biomass production, a proxy measure of reliability, increased with higher diversity when examined at the level of the assemblage (i.e. among-replicate assemblages) but not at the levels of functional group or species. These stabilizing processes were weakest, in low-diversity, low-density assemblages. This experiment demonstrates the utility of hierarchical analysis of ecosystem reliability at the assemblage, functional group and species level.

• 出版日期2008-3
• 单位北京大学