Xiaobin Hua, Christopher H. Lusk, Ian A. Dickie, Stephen Adu-Bredu, Kathryn J. Allen, Viviana Araus, Laurent Augusto, Pavel Barsukov, David Bauman, Félix Brédoire, David F. R. P. Burslem, James W. Dalling, Leen Depauw, Kyle G. Dexter, Thomas Drouet, John L. Godlee, Roberto Godoy, Rodrigo A. Gutiérrez, Jonathan Ilunga Muledi, Arnaud Jacobs, Robert Kooyman, Claudio Latorre, Jesús López Angulo, Sébastien Macé, Sybryn L. Maes, Francisco Maiato Pedro Gonçalves, Ben Hur Marimon Junior, Manuel Nicolas, Reuben Nilus, Michael O'Brien, Imma Oliveras Menor, Frida I. Piper, Jennifer Read, Glen Reynolds, Alfredo Saldaña, Beatriz Schwantes Marimon, Kris Verheyen, Mark Westoby, Benjamin Wigley, Ian J. Wright
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引用次数: 0
Abstract
Aim
Arbuscular mycorrhizas (AM) and ectomycorrhizas (ECM) have different impacts on nutrient cycling, carbon storage, community dynamics and enhancement of photosynthesis by rising CO2. Recent global analyses have concluded that patterns of AM/ECM dominance in forests worldwide are shaped by climate, with soil nutrients contributing negligible additional explanatory power. However, their reliance on nutrient data from GIS surfaces masks important local influences of parent material, topography and soil age on soil nutrient status. We asked if use of site-specific nutrient data reveals a more important role for nutrients.
Time Period
Present day.
Location
Global dataset comprising 703 sites, encompassing forests, savanna/woodlands, shrublands and deserts on all continents except Antarctica.
Taxa Studied
Arborescent plants, including angiosperms, gymnosperms and tree ferns.
Methods
Generalised Additive Models for Location, Scale and Shape (GAMLSS) to determine the effects of climate variables, soil nitrogen and soil phosphorus on the proportional representation of ECM and of non-mycorrhizal species (NM) in woody vegetation.
Results
GAMLSS showed a strong negative relationship of ECM representation with mean annual temperature (MAT), and a strong negative relationship with soil total nitrogen. NM representation was highest on dry sites and phosphorus-poor sites. Reanalysis showed that GIS-derived soil nutrient data had less explanatory power than site-specific nutrient data, and resulted in poorer model fits.
Conclusions
Our results support the long-held belief that soil nutrients as well as climate influence the relative fitness of different mycorrhizal syndromes worldwide, and demonstrate the value of using site-specific nutrient data. Soil nutrients should be considered when predicting the impact of climate change on the mycorrhizal composition of vegetation and resulting shifts in ecosystem processes.
期刊介绍：
Global Ecology and Biogeography (GEB) welcomes papers that investigate broad-scale (in space, time and/or taxonomy), general patterns in the organization of ecological systems and assemblages, and the processes that underlie them. In particular, GEB welcomes studies that use macroecological methods, comparative analyses, meta-analyses, reviews, spatial analyses and modelling to arrive at general, conceptual conclusions. Studies in GEB need not be global in spatial extent, but the conclusions and implications of the study must be relevant to ecologists and biogeographers globally, rather than being limited to local areas, or specific taxa. Similarly, GEB is not limited to spatial studies; we are equally interested in the general patterns of nature through time, among taxa (e.g., body sizes, dispersal abilities), through the course of evolution, etc. Further, GEB welcomes papers that investigate general impacts of human activities on ecological systems in accordance with the above criteria.
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