Understanding the dominant controls on litter decomposition

作者：Bradford, Mark A.^*; Berg, Bjorn; Maynard, Daniel S.; Wieder, William R.; Wood, Stephen A.

来源：Journal of Ecology, 2016, 104(1): 229-238.

DOI：10.1111/1365-2745.12507

• biogeochemical models
• ecological fallacy
• ecosystem processes
• experimental design
• litter decomposition
• nutrient cycling
• plant-soil (below-ground) interactions
• scale
• soil carbon
• variability

1. Litter decomposition is a biogeochemical process fundamental to element cycling within ecosystems, influencing plant productivity, species composition and carbon storage. @@@ 2. Climate has long been considered the primary broad-scale control on litter decomposition rates, yet recent work suggests that plant litter traits may predominate. Both decomposition paradigms, however, rely on inferences from cross-biome litter decomposition studies that analyse site-level means. @@@ 3. We re-analyse data from a classical cross-biome study to demonstrate that previous research may falsely inflate the regulatory role of climate on decomposition and mask the influence of unmeasured local-scale factors. @@@ 4. Using the re-analysis as a platform, we advocate experimental designs of litter decomposition studies that involve high within-site replication, measurements of regulatory factors and processes at the same local spatial grain, analysis of individual observations and biome-scale gradients. @@@ 5. Synthesis. We question the assumption that climate is the predominant regulator of decomposition rates at broad spatial scales. We propose a framework for a new generation of studies focused on factoring local-scale variation into the measurement and analysis of soil processes across broad scales. Such efforts may suggest a revised decomposition paradigm and ultimately improve confidence in the structure, parameter estimates and hence projections of biogeochemical models.

• 出版日期2016-1