@article{ReineckeWulfBaetenetal.2016,
  author    = {Reinecke, J. and Wulf, M. and Baeten, Lander and Brunet, J. and Decocq, G. and De Frenne, G. and Diekmann, M. and Graae, B. J. and Heinken, Thilo and Hermy, M. and Jamoneau, A. and Lenoir, J. and Plue, J. and Orczewska, A. and Van Calster, H. and Verheyen, Kris and Naaf, T.},
  title     = {Acido- and neutrophilic temperate forest plants display distinct shifts in ecological pH niche across north-western Europe},
  series = {Ecography : pattern and diversity in ecology ; research papers forum},
  volume    = {39},
  journal   = {Ecography : pattern and diversity in ecology ; research papers forum},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {0906-7590},
  doi       = {10.1111/ecog.02051},
  pages     = {1164 -- 1175},
  year      = {2016},
  abstract  = {Ecological niches of organisms vary across geographical space, but niche shift patterns between regions and the underlying mechanisms remain largely unexplored. We studied shifts in the pH niche of 42 temperate forest plant species across a latitudinal gradient from northern France to boreo-nemoral Sweden. We asked 1) whether species restrict their niches with increasing latitude as they reach their northern range margin (environmental constraints); 2) whether species expand their niches with increasing latitude as regional plant species richness decreases (competitive release); and 3) whether species shift their niche position toward more acidic sites with increasing latitude as the relative proportion of acidic soils increases (local adaptation). Based on 1458 vegetation plots and corresponding soil pH values, we modelled species response curves using Huisman-Olff-Fresco models. Four niche measures (width, position, left and right border) were compared among regions by randomization tests. We found that with increasing latitude, neutrophilic species tended to retreat from acidic sites, indicating that these species retreat to more favorable sites when approaching their range margin. Alternatively, these species might benefit from enhanced nitrogen deposition on formerly nutrient-poor, acidic sites in southern regions or lag behind in post-glacial recolonization of potential habitats in northern regions. Most acidophilic species extended their niche toward more base-rich sites with increasing latitude, indicating competitive release from neutrophilic species. Alternatively, acidophilic species might benefit from optimal climatic conditions in the north where some have their core distribution area. Shifts in the niche position suggested that local adaptation is of minor importance. We conclude that shifts in the pH niche of temperate forest plants are the rule, but the directions of the niche shifts and possible explanations vary. Our study demonstrates that differentiating between acidophilic and neutrophilic species is crucial to identify general patterns and underlying mechanisms.},
  language  = {en}
}
@article{CaronDeFrenneChabrerieetal.2015,
  author    = {Caron, Maria Mercedes and De Frenne, P. and Chabrerie, Olivier and Cousins, S. A. O. and De Backer, L. and Decocq, G. and Diekmann, M. and Heinken, Thilo and Kolb, A. and Naaf, T. and Plue, J. and Selvi, F. and Strimbeck, G. R. and Wulf, M. and Verheyen, Kris},
  title     = {Impacts of warming and changes in precipitation frequency on the regeneration of two Acer species},
  series = {Flora : morphology, distribution, functional ecology of plants},
  volume    = {214},
  journal   = {Flora : morphology, distribution, functional ecology of plants},
  publisher = {Elsevier},
  address   = {Jena},
  issn      = {0367-2530},
  doi       = {10.1016/j.flora.2015.05.005},
  pages     = {24 -- 33},
  year      = {2015},
  language  = {en}
}
@article{KaiserEllerbrockWulfetal.2012,
  author    = {Kaiser, M. and Ellerbrock, Ruth H. and Wulf, M. and Dultz, S. and Hierath, C. and Sommer, M.},
  title     = {The influence of mineral characteristics on organic matter content, composition, and stability of topsoils under long-term arable and forest land use},
  series = {Journal of geophysical research : Biogeosciences},
  volume    = {117},
  journal   = {Journal of geophysical research : Biogeosciences},
  number    = {4},
  publisher = {American Geophysical Union},
  address   = {Washington},
  issn      = {0148-0227},
  doi       = {10.1029/2011JG001712},
  pages     = {16},
  year      = {2012},
  abstract  = {In this study, we analyzed the influence of soil mineral characteristics (e. g., clay concentration and mineralogical composition, iron and aluminum oxide concentration and crystallinity, specific surface area, and exchangeable cation concentration) on (i) organic carbon (OC) content (kg m(-2)) and (ii) the concentration (g kg(-1)), composition, and stability of the mineral-associated organic matter (OM) of arable and forest topsoils. We selected seven soil types with different mineral characteristics for this study. For each soil type, samples were taken from topsoils of a deciduous forest and an adjacent arable site. The arable and forest sites have been used continuously for more than 100 years. Na-pyrophosphate soluble OM fractions (OM(PY)), representing mineral-associated OM, were extracted, analyzed for OC and C-14 concentrations, and characterized by FTIR spectroscopy. For the forest and arable topsoils, a linear relationship was found between the OC content and exchangeable Ca. For the arable topsoils (pH 6.7-7.5), correlation analyses indicated that the OCPY concentration increased with an increase in oxalate soluble Fe and Al, exchangeable Ca, and Na-pyrophosphate soluble Mg and Fe concentrations. The stability of OM(PY) determined by the C-14 measurements of the near-neutral arable topsoils was shown to increase with the specific surface area and the concentration of exchangeable Ca. For the acidic forest topsoils (pH < 5), the stability of OM(PY) was found to increase as the pH, and the concentration of C=O groups and Na-pyrophosphate soluble Mg increase.},
  language  = {en}
}