Dynamics of Forage Production in Pasture-woodlands of the Swiss Jura Mountains under Projected Clima

Silvopastoral systems of the Swiss Jura Mountains serve as a traditional source of forage and timber in the subalpine vegetation belt, but their vulnerability to land use and climate change puts their future sustainability at stake. We coupled experimental and modeling approaches to assess the impact of climate change on the pasture-woodland landscape. We drew conclusions on the resistance potential of wooded pastures with different management intensities by sampling along a canopy cover gradient. This gradient spanned from unwooded pastures associated with intensive farming to densely wooded pastures associated with extensive farming. Transplanted mesocosms of these ecosystems placed at warmer and drier conditions provided experimental evidence that climate change reduced herbaceous biomass production in unwooded pastures but had no effect in sparsely wooded pastures, and even stimulated productivity in densely wooded pastures. Through modeling these results with a spatially explicit model of wooded pastures (WoodPaM) modified for the current application, results were extrapolated to the local landscape under two regionalized Intergovernmental Panel on Climate Change scenarios for climate change. This led to the suggestion that within the Jura pasture-woodlands, forage production in the near future (2000-2050 AD) would be affected disproportionately throughout the landscape. A stable forage supply in hot, dry years would be provided only by extensive and moderate farming, which allows the development of an insulating tree cover within grazed pastures. We conclude that such structural landscape diversity would grant wood-pastures with a buffering potential in the face of climate change in the forthcoming decades.

[1]  François Gillet,et al.  Past and future landscape dynamics in pasture-woodlands of the Swiss Jura Mountains under climate change , 2013 .

[2]  W. Bowman,et al.  Nitrogen critical loads for alpine vegetation and terrestrial ecosystem response: are we there yet? , 2006, Ecological applications : a publication of the Ecological Society of America.

[3]  J. P. Grime,et al.  The response of two contrasting limestone grasslands to simulated climate change. , 2000, Science.

[4]  David Johnson,et al.  Drought alters carbon fluxes in alpine snowbed ecosystems through contrasting impacts on graminoids and forbs. , 2011, The New phytologist.

[5]  D. Lüthi,et al.  The role of increasing temperature variability in European summer heatwaves , 2004, Nature.

[6]  C. Körner,et al.  High-Elevation Land Use, Biodiversity, and Ecosystem Functioning , 2006 .

[7]  J. Harte,et al.  Shifting Dominance Within a Montane Vegetation Community: Results of a Climate-Warming Experiment , 1995, Science.

[8]  Nadejda A. Soudzilovskaia,et al.  Effects of fertilisation and irrigation on ‘foliar afterlife’ in alpine tundra , 2007 .

[9]  D. Inouye,et al.  Effects of climate change on phenology, frost damage, and floral abundance of montane wildflowers. , 2008, Ecology.

[10]  April E. Reside,et al.  Multiscale topoedaphic heterogeneity increases resilience and resistance of a dominant grassland species to extreme drought and climate change , 2011 .

[11]  M. Beniston.  Decadal‐scale changes in the tails of probability distribution functions of climate variables in Switzerland , 2009 .

[12]  M. Araújo,et al.  Exposure of global mountain systems to climate warming during the 21st Century , 2007 .

[13]  Martin Dieterich,et al.  Cultural Landscapes and Land Use , 2004 .

[14]  D. Stephenson,et al.  Future extreme events in European climate: an exploration of regional climate model projections , 2007 .

[15]  F. Berendse,et al.  Diversity enhances community recovery, but not resistance, after drought , 2010 .

[16]  M. Sebastià,et al.  Plant guilds drive biomass response to global warming and water availability in subalpine grassland , 2006 .

[17]  J. Stöcklin,et al.  Genotypic and environmental variation in specific leaf area in a widespread Alpine plant after transplantation to different altitudes , 2010, Oecologia.

[18]  H. Müller-Schärer,et al.  Nurse plants, tree saplings and grazing pressure: changes in facilitation along a biotic environmental gradient , 2007, Oecologia.

[19]  Does the strength of facilitation by nurse shrubs depend on grazing resistance of tree saplings , 2009 .

[20]  Christian Hirschi,et al.  Research, part of a Special Feature on Sustainable Land-Use Practices in Mountain Regions: Integrative Analysis of Ecosystem Dynamics Under Global Change, Social-Economic Impacts, and Policy Implications Modeling Social-Ecological Feedback Effects in the Implementation of Payments for Environmental , 2013 .

[21]  François Gillet,et al.  Spatial and Seasonal Patterns of Cattle Habitat use in a Mountain Wooded Pasture , 2006, Landscape Ecology.

[22]  Olivier Besson,et al.  PATUMOD: a compartment model of vegetation dynamics in wooded pastures , 2002 .

[23]  M. Cosma.  Cultural landscapes , 2015 .

[24]  H. Bruelheide.  Translocation of a montane meadow to simulate the potential impact of climate change , 2003 .

[25]  S. Seneviratne,et al.  Contrasting response of European forest and grassland energy exchange to heatwaves , 2010 .

[26]  M. Araújoc,et al.  Exposure of global mountain systems to climate warming during the 21 st Century , 2007 .

[27]  A. Buttler,et al.  The Swiss Mountain Wooded Pastures: Patterns and Processes , 2009 .

[28]  A. Buttler,et al.  Influence of tree cover on the diversity of herbaceous communities in subalpine wooded pastures , 1999 .

[29]  M. Etienne,et al.  Western European Silvopastoral Systems , 1996 .

[30]  M. Parry,et al.  Assessment of potential effects and adaptations for climate change in Europe : the Europe acacia project , 2000 .

[31]  F. Chapin,et al.  An experimental test of limits to tree establishment in Arctic tundra , 1998 .

[32]  François Gillet,et al.  Modelling vegetation dynamics in heterogeneous pasture-woodland landscapes , 2008 .

[33]  T. Spiegelberger,et al.  How do plant community ecologists consider the complementarity of observational, experimental and theoretical modelling approaches? , 2012 .

[34]  G. Neuner,et al.  Variability of Heat Tolerance in Alpine Plant Species Measured at Different Altitudes , 2003 .

[35]  J. Welker,et al.  Tibetan Alpine Tundra Responses to Simulated Changes in Climate: Aboveground Biomass and Community Responses , 1996 .

[36]  Martin Beniston,et al.  CLIMATIC CHANGE AT HIGH ELEVATION SITES: AN OVERVIEW , 1997 .

[37]  J. Yavitt,et al.  Peatlands and global climate change: Insights from comparative studies of sites situated along a latitudinal gradient , 1994, Wetlands.

[38]  T. Vesala,et al.  Reduction of ecosystem productivity and respiration during the European summer 2003 climate anomaly: a joint flux tower, remote sensing and modelling analysis , 2007 .

[39]  A. Buttler,et al.  Plant species richness and environmental heterogeneity in a mountain landscape: effects of variability and spatial configuration , 2006 .

[40]  F. Gillet,et al.  Wooded pastures of the Jura mountains , 1996 .

[41]  R. Pachauri.  Climate change 2007. Synthesis report. Contribution of Working Groups I, II and III to the fourth assessment report , 2008 .

[42]  E. Bork,et al.  Aspen canopy removal and root trenching effects on understory vegetation , 2006 .

[43]  John Harte,et al.  SUBALPINE MEADOW FLOWERING PHENOLOGY RESPONSES TO CLIMATE CHANGE: INTEGRATING EXPERIMENTAL AND GRADIENT METHODS , 2003 .

[44]  A. Buttler,et al.  Short-Term Effects of Cattle Browsing on Tree Sapling Growth in Mountain Wooded Pastures , 2007, Plant Ecology.

[45]  John Harte,et al.  INTEGRATING EXPERIMENTAL AND GRADIENT METHODS IN ECOLOGICAL CLIMATE CHANGE RESEARCH , 2004 .

[46]  C. Körner,et al.  Land Use Change and Mountain Biodiversity , 2006 .

[47]  M. Brock,et al.  Drought tolerance in the alpine dandelion, Taraxacum ceratophorum (Asteraceae), its exotic congener T. officinale, and interspecific hybrids under natural and experimental conditions. , 2005, American journal of botany.

[48]  François Gillet,et al.  A Contextual Analysis of Land-Use and Vegetation Changes in Two Wooded Pastures in the Swiss Jura Mountains , 2013 .

[49]  P. Ciais,et al.  Europe-wide reduction in primary productivity caused by the heat and drought in 2003 , 2005, Nature.

[50]  S. Carpenter,et al.  Global Consequences of Land Use , 2005, Science.