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Overstorey–Understorey Interactions Intensify After Drought-Induced Forest Die-Off: Long-Term Effects for Forest Structure and Composition

Overstorey–Understorey Interactions Intensify After Drought-Induced Forest Die-Off: Long-Term... Severe drought events increasingly affect forests worldwide, but little is known about their long-term effects at the ecosystem level. Competition between trees and herbs (‘overstorey–understorey competition’) for soil water can reduce tree growth and regeneration success and may thereby alter forest structure and composition. However, these effects are typically ignored in modelling studies. To test the long-term impact of water competition by the herbaceous understorey on forest dynamics, we incorporated this process in the dynamic forest landscape model LandClim. Simulations were performed both with and without understorey under current and future climate scenarios (RCP4.5 and RCP8.5) in a drought-prone inner-Alpine valley in Switzerland. Under current climate, herbaceous understorey reduced tree regeneration biomass by up to 51%, particularly in drought-prone landscape positions (i.e., south-facing, low-elevation slopes), where it also caused a shift in forest composition towards drought-tolerant tree species (for example, Quercus pubescens). For adult trees, the understorey had a minor effect on growth. Under future climate change scenarios, increasing drought frequency and intensity resulted in large-scale mortality of canopy trees, which intensified the competitive interaction between the understorey and tree regeneration. At the driest landscape positions, a complete exclusion of tree regeneration and a shift towards an open, savannah-like vegetation occurred. Overall, our results demonstrate that water competition by the herbaceous understorey can cause long-lasting legacy effects on forest structure and composition across drought-prone landscapes, by affecting the vulnerable recruitment phase. Ignoring herbaceous vegetation may thus lead to a strong underestimation of future drought impacts on forests. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecosystems Springer Journals

Overstorey–Understorey Interactions Intensify After Drought-Induced Forest Die-Off: Long-Term Effects for Forest Structure and Composition

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Life Sciences; Ecology; Plant Sciences; Zoology; Environmental Management; Geoecology/Natural Processes; Hydrology/Water Resources
ISSN
1432-9840
eISSN
1435-0629
DOI
10.1007/s10021-017-0181-5
Publisher site
See Article on Publisher Site

Abstract

Severe drought events increasingly affect forests worldwide, but little is known about their long-term effects at the ecosystem level. Competition between trees and herbs (‘overstorey–understorey competition’) for soil water can reduce tree growth and regeneration success and may thereby alter forest structure and composition. However, these effects are typically ignored in modelling studies. To test the long-term impact of water competition by the herbaceous understorey on forest dynamics, we incorporated this process in the dynamic forest landscape model LandClim. Simulations were performed both with and without understorey under current and future climate scenarios (RCP4.5 and RCP8.5) in a drought-prone inner-Alpine valley in Switzerland. Under current climate, herbaceous understorey reduced tree regeneration biomass by up to 51%, particularly in drought-prone landscape positions (i.e., south-facing, low-elevation slopes), where it also caused a shift in forest composition towards drought-tolerant tree species (for example, Quercus pubescens). For adult trees, the understorey had a minor effect on growth. Under future climate change scenarios, increasing drought frequency and intensity resulted in large-scale mortality of canopy trees, which intensified the competitive interaction between the understorey and tree regeneration. At the driest landscape positions, a complete exclusion of tree regeneration and a shift towards an open, savannah-like vegetation occurred. Overall, our results demonstrate that water competition by the herbaceous understorey can cause long-lasting legacy effects on forest structure and composition across drought-prone landscapes, by affecting the vulnerable recruitment phase. Ignoring herbaceous vegetation may thus lead to a strong underestimation of future drought impacts on forests.

Journal

Ecosystems – Springer Journals

Published: Sep 7, 2017

References

  • Topography alters tree growth-climate relationships in a semi-arid forested catchment
    Adams, HR; Barnard, HR; Loomis, AK
  • A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests
    Allen, CD; Macalady, AK; Chenchouni, H; Bachelet, D; McDowell, N; Vennetier, M; Kitzberger, T; Rigling, A; Breshears, DD; Hogg, EH; Gonzalez, P; Fensham, R; Zhang, Z; Castro, J; Demidova, N; Lim, JH; Allard, G; Running, SW; Semerci, A; Cobb, N
  • Effects of widespread drought-induced aspen mortality on understory plants
    Anderegg, WRL; Anderegg, LDL; Sherman, C; Karp, DS
  • Consequences of widespread tree mortality triggered by drought and temperature stress
    Anderegg, WRL; Kane, JM; Anderegg, LDL
  • Pervasive drought legacies in forest ecosystems and their implications for carbon cycle models
    Anderegg, WRL; Schwalm, C; Biondi, F; Camarero, JJ; Koch, G; Litvak, M; Ogle, K; Shaw, JD; Shevliakova, E; Williams, AP; Wolf, A; Ziaco, E; Pacala, S
  • Designing forest vegetation management strategies based on the mechanisms and dynamics of crop tree competition by neighbouring vegetation
    Balandier, P; Collet, C; Miller, JH; Reynolds, PE; Zedaker, SM
  • On measuring and modeling energy fluxes above the floor of a homogeneous and heterogeneous conifer forest
    Baldocchi, DD; Law, BE; Anthoni, PM
  • How plant functional-type, weather, seasonal drought, and soil physical properties alter water and energy fluxes of an oak-grass savanna and an annual grassland
    Baldocchi, DD; Xu, LK; Kiang, N
  • Drought as an inciting mortality factor in Scots pine stands of the Valais, Switzerland
    Bigler, C; Braker, OU; Bugmann, H; Dobbertin, M; Rigling, A
  • Processes controlling understorey evapotranspiration
    Black, TA; Kelliher, FM
  • A review of forest gap models
    Bugmann, H
  • Improving the behaviour of forest gap models along drought gradients
    Bugmann, H; Cramer, W
  • Coupling a water balance model with forest inventory data to predict drought stress: the role of forest structural changes vs. climate changes
    Cáceres, MD; Martínez-Vilalta, J; Coll, L; Llorens, P; Casals, P; Poyatos, R; Pausas, JG; Brotons, L
  • The impacts of increasing drought on forest dynamics, structure, and biodiversity in the United States
    Clark, JS; Iverson, L; Woodall, CW; Allen, CD; Bell, DM; Bragg, DC; D’Amato, AW; Davis, FW; Hersh, MH; Ibanez, I; Jackson, ST; Matthews, S; Pederson, N; Peters, M; Schwartz, MW; Waring, KM; Zimmermann, NE
  • Flux partitioning between understorey and overstorey in a boreal spruce/pine forest determined by the eddy covariance method
    Constantin, J; Grelle, A; Ibrom, A; Morgenstern, K
  • Increasing drought under global warming in observations and models
    Dai, AG
  • Competition between tree seedlings and herbaceous vegetation: support for a theory of resource supply and demand
    Davis, MA; Wrage, KJ; Reich, PB
  • Short- and long-term efficacy of forest thinning to mitigate drought impacts in mountain forests in the European Alps
    Elkin, C; Giuggiola, A; Rigling, A; Bugmann, H
  • A 2 degrees C warmer world is not safe for ecosystem services in the European Alps
    Elkin, C; Gutierrez, AG; Leuzinger, S; Manusch, C; Temperli, C; Rasche, L; Bugmann, H
  • Transpirational supply and demand: plant, soil, and atmospheric effects evaluated by simulation
    Federer, CA
  • Seedling emergence and growth of Quercus spp. following severe drought effects on a Pinus sylvestris canopy
    Galiano, L; Martinez-Vilalta, J; Eugenio, M; Granzow-de la Cerda, I; Lloret, F
  • The fern understory as an ecological filter: emergence and establishment of canopy-tree seedlings
    George, LO; Bazzaz, FA
  • Terrestrial vegetation and water balance—hydrological evaluation of a dynamic global vegetation model
    Gerten, D; Schaphoff, S; Haberlandt, U; Lucht, W; Sitch, S
  • The ecological significance of the herbaceous layer in temperate forest ecosystems
    Gilliam, FS
  • Reduction of stand density increases drought resistance in xeric Scots pine forests
    Giuggiola, A; Bugmann, H; Zingg, A; Dobbertin, M; Rigling, A
  • Transpiration of four common understorey plant species according to drought intensity in temperate forests
    Gobin, R; Korboulewsky, N; Dumas, Y; Balandier, P
  • Canopy closure exerts weak controls on understory dynamics: a 30-year study of overstory-understory interactions
    Halpern, CB; Lutz, JA
  • Climate change may cause severe loss in the economic value of European forest land
    Hanewinkel, M; Cullmann, DA; Schelhaas, MJ; Nabuurs, GJ; Zimmermann, NE
  • Reviving extinct Mediterranean forest communities may improve ecosystem potential in a warmer future
    Henne, PD; Elkin, C; Franke, J; Colombaroli, D; Calò, C; Mantia, T; Pasta, S; Conedera, M; Dermody, O; Tinner, W
  • Did soil development limit spruce (Picea abies) expansion in the Central Alps during the Holocene? Testing a palaeobotanical hypothesis with a dynamic landscape model
    Henne, PD; Elkin, CM; Reineking, B; Bugmann, H
  • Evapotranspiration from understory vegetation in an eastern Siberian boreal larch forest
    Iida, S; Ohta, T; Matsumoto, K; Nakai, T; Kuwada, T; Kononov, AV; Maximov, TC; Molen, MK; Dolman, H; Tanaka, H; Yabuki, H
  • A global analysis of root distributions for terrestrial biomes
    Jackson, RB; Canadell, J; Ehleringer, JR; Mooney, HA; Sala, OE; Schulze, ED
  • Carbon dioxide and energy flux partitioning between the understorey and the overstorey of a maritime pine forest during a year with reduced soil water availability
    Jarosz, N; Brunet, Y; Lamaud, E; Irvine, M; Bonnefond, JM; Loustau, D
  • How tree cover influences the water-balance of Mediterranean rangelands
    Joffre, R; Rambal, S
  • A sensitive slope: estimating landscape patterns of forest resilience in a changing climate
    Johnstone, JF; McIntire, EJB; Pedersen, EJ; King, G; Pisaric, MJF
  • Interactions of woody and herbaceous vegetation in a southern African savanna
    Knoop, W; Walker, B
  • The herbaceous layer in forests of eastern North America
    McCarthy, BC
  • Composition, structure and dynamics of Dysart Woods, an old-growth mixed mesophytic forest of southeastern Ohio
    McCarthy, BC; Small, CJ; Rubino, DL
  • Fine root distribution in dehesas of central-western Spain
    Moreno, G; Obrador, JJ; Cubera, E; Dupraz, C
  • Competitive interference between selected herbaceous and woody plants and Pinus taeda L. during two growing seasons following planting
    Morris, LA; Moss, SA; Garbett, WS
  • Potential shift in tree species composition after interaction of fire and drought in the Central Alps
    Moser, B; Temperli, C; Schneiter, G; Wohlgemuth, T
  • Competition for water and nutrients in forests
    Nambiar, EKS; Sands, R
  • Development and evaluation of aboveground small tree biomass models for naturally regenerated and planted species in eastern Maine, U.S.A
    Nelson, AS; Weiskittel, AR; Wagner, RG; Saunders, MR
  • A review of light interception in plant stands from leaf to canopy in different plant functional types and in species with varying shade tolerance
    Niinemets, U
  • Climate change—bad news for montane forest herb layer species?
    Patsias, K; Bruelheide, H
  • The role of below-ground competition during early stages of secondary succession: the case of 3-year-old Scots pine (Pinus sylvestris L.) seedlings in an abandoned grassland
    Picon-Cochard, C; Coll, L; Balandier, P
  • Compared effects of competition by grasses (Graminoids) and broom (Cytisus scoparius) on growth and functional traits of beech saplings (Fagus sylvatica)
    Provendier, D; Balandier, P
  • R: a language and environment for statistical computing
  • Robust climate scenarios for sites with sparse observations: a two-step bias correction approach
    Rajczak, J; Kotlarski, S; Salzmann, N; Schar, C
  • Vegetation management-practices in plantation forests of Australia and New-Zealand
    Richardson, B
  • Driving factors of a vegetation shift from Scots pine to pubescent oak in dry Alpine forests
    Rigling, A; Bigler, C; Eilmann, B; Feldmeyer-Christe, E; Gimmi, U; Ginzler, C; Graf, U; Mayer, P; Vacchiano, G; Weber, P; Wohlgemuth, T; Zweifel, R; Dobbertin, M
  • Intra-annual tree-ring parameters indicating differences in drought stress of Pinus sylvestris forests within the Erico-Pinion in the Valais (Switzerland)
    Rigling, A; Braker, O; Schneiter, G; Schweingruber, F
  • Seasonal changes in leaf area, stomatal and canopy conductances and transpiration from bracken below a forest canopy
    Roberts, J; Pymar, CF; Wallace, JS; Pitman, RM
  • On the formation of dense understory layers in forests worldwide: consequences and implications for forest dynamics, biodiversity, and succession
    Royo, AA; Carson, WP
  • Plant community response to drought-induced canopy defoliation in a Mediterranean Quercus ilex forest
    Saura-Mas, S; Bonas, A; Lloret, F
  • Forest floor evaporation in a dense Douglas fir stand
    Schaap, MG; Bouten, W
  • From monocultures to mixed-species forests: is tree diversity key for providing ecosystem services at the landscape scale?
    Schuler, LJ; Bugmann, H; Snell, RS
  • Plant ecology
    Schulze, ED; Beck, E; Müller-Hohenstein, K
  • The relative importance of climatic effects, wildfires and management for future forest landscape dynamics in the Swiss Alps
    Schumacher, S; Bugmann, H
  • Improving the formulation of tree growth and succession in a spatially explicit landscape model
    Schumacher, S; Bugmann, H; Mladenoff, D
  • Modeling postglacial vegetation dynamics of temperate forests on the Olympic Peninsula (WA, USA) with special regard to snowpack
    Schwörer, C; Fisher, DM; Gavin, DG; Temperli, C; Bartlein, PJ
  • Recruitment patterns following a severe drought: long-term compositional shifts in Patagonian forests
    Suarez, ML; Kitzberger, T
  • Herbaceous understorey: an overlooked player in forest landscape dynamics?
    Thrippleton, T; Bugmann, H; Kramer-Priewasser, K; Snell, RS
  • Simulating long-term vegetation dynamics using a forest landscape model: the post-Taupo succession on Mt Hauhungatahi, North Island, New Zealand
    Thrippleton, T; Dolos, K; Perry, GLW; Groeneveld, J; Reineking, B
  • The role of vegetation management for enhancing productivity of the world’s forests
    Wagner, RG; Little, KM; Richardson, B; McNabb, K
  • Walter’s two-layer hypothesis revisited: back to the roots!
    Ward, D; Wiegand, K; Getzin, S
  • Estimating the potential impact of vegetation on the water cycle requires accurate soil water parameter estimation
    Wolf, A
  • Effects of topography and woody plant canopy cover on near-ground solar radiation: Relevant energy inputs for ecohydrology and hydropedology
    Zou, CB; Barron-Gafford, GA; Breshears, DD