Abstract
Climate change and increased atmospheric nitrogen (N) deposition can alter successional processes, either by directly altering the establishment and growth of later successional species or by altering their interactions with earlier successional species. We examined the effects of these global change factors on post-germination tree establishment in a grass-dominated old field in London, Ontario, Canada, by transplanting tree seedlings into the plots of a warming and N addition field experiment. Transplantation was duplicated over two growing seasons. We also administered warming and N addition treatments to tree seedlings in the absence of grasses in a greenhouse in order to examine the direct seedling responses. In the field, seedling survival was generally low over the first growing season, which was very dry. The only significant treatment effects were those of warming decreasing the survival and biomass of Malus coronaria, and N addition increasing the survival of Elaeagnus umbellata. Grass biomass increased in response to N addition, and seedling condition and survival were positively correlated with increased grass biomass for most species. Seedling survival was much higher in the second growing season, although warming decreased the survival of Rhamnus cathartica and Rhus typhina. N addition increased the biomass and leaf area of M. coronaria, but decreased these responses for R. typhina, and warming increased the leaf area of Fraxinus americana. Grass biomass again increased in response to N addition, but unlike the previous year, seedling condition and survival were generally negatively correlated with increased grass biomass. In the greenhouse (grasses absent), the seedlings generally increased in biomass in response to N addition and were unresponsive to warming. Our results indicate that both warming and N addition can affect the processes determining post-germination tree seedling establishment, and that depending on the environmental conditions, and in particular water availability, the responses of grasses appear to either facilitate or suppress seedling condition and survival.
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Arft A, Walker M, Gurevitch J, Alatalo J, Bret-Harte M, Dale M, Diemer M, Gugerli F, Henry G, Jones M, Hollister R, Jonsdottir I, Laine K, Levesque E, Marion G, Molau U, Molgaard P, Nordenhall U, Raszhivin V, Robinson C, Starr G, Stenstrom A, Stenstrom M, Totland O, Turner P, Walker L, Webber P, Welker J, Wookey P (1999) Responses of tundra plants to experimental warming: Metaanalysis of the international tundra experiment. Ecol Monogr 69:491–511
Berkowitz AR, Canham CD, Kelly VR (1995) Competition vs facilitation of tree seedling growth and survival in early successional communities. Ecology 76:1156–1168
Bloor JMG, Barthes L, Leadley PW (2008) Effects of elevated CO2 and N on tree-grass interactions: an experimental test using Fraxinus excelsior and Dactylis glomerata. Funct Ecol 22:537–546
Brooker RW (2006) Plant-plant interactions and environmental change. New Phytol 171:271–284
Burton PJ, Bazzaz FA (1995) Ecophysiological responses to tree seedlings invading different patches of old-field vegetation. J Ecol 83:99–112
Classen AT, Norby RJ, Campany CE, Sides KE, Weltzin JF (2010) Climate change alters seedling emergence and establishment in an old-field ecosystem. PLoS ONE 5:e13476
Davis MA, Wrage KJ, Reich PB, Tjoelker MG, Schaeffer T, Muermann C (1999) Survival, growth, and photosynthesis of tree seedlings competing with herbaceous vegetation along a water-light-nitrogen gradient. Plant Ecol 145:341–350
Desteven D (1991) Experiments on mechanisms of tree establishment in old-field succession -Seedling survival and growth. Ecology 72:1076–1088
Dickie IA, Schnitzer SA, Reich PB, Hobbie SE (2007) Is oak establishment in old-fields and savanna openings context dependent? J Ecol 95:309–320
Donath TW, Eckstein RL (2010) Effects of bryophytes and grass litter on seedling emergence vary by vertical seed position and seed size. Plant Ecol 207:257–268
Drescher M, Thomas SC (2013) Snow cover manipulations alter survival of early life stages of cold-temperate tree species. Oikos 122:541–554
Dukes J, Chiariello NR, Cleland EE, Moore LA, Shaw MR, Thayer S, Tobeck T, Mooney HA, Field CB (2005) Responses of grassland production to single and multiple global environmental changes. PLoS Biol 3:1829–1837
Dunnett N, Grime J (1999) Competition as an amplifier of short-term vegetation responses to climate: an experimental test. Funct Ecol 13:388–395
Facelli JM (1994) Multiple indirect effects of plant litter affect the establishment of woody seedlings in old fields. Ecology 75:1727–1735
Fenner M (1985) Seed Ecology. Chapman & Hall, London, UK
Flory SL, Clay K (2010) Non-native grass invasion suppresses forest succession. Oecologia 164:1029–1038
Franco A, Nobel P (1989) Effect of nurse plants on the microhabitat and growth of cacti. J Ecol 77:870–886
Gardescu S, Marks PL (2004) Colonization of old fields by trees vs. shrubs: seed dispersal and seedling establishment. J Torr Bot Soc 131:53–68
Gill DS, Marks PL (1991) Tree and shrub seedling colonization of old fields in central New York. Ecol Monogr 61:183–205
Hagerty TP, Kingston MS (1992) The Soils of Middlesex County. Ontario Ministry of Agriculture and Food, Guelph
Hutchison JS, Henry HAL (2010) Additive effects of warming and increased nitrogen deposition in a temperate old field: Plant productivity and the importance of winter. Ecosystems 13:661–672
Inouye R, Huntly N, Tilman D, Tester J, Stillwell M, Zinnel K (1987) Old-field succession on a Minnesota sand plain. Ecology 68:12–26
Jentsch A, Kreyling J, Beierkuhnlein C (2007) A new generation of climate-change experiments: events, not trends. Front Ecol Environ 5:365–374
Jurena P, Archer S (2003) Woody plant establishment and spatial heterogeneity in grasslands. Ecology 84:907–919
Laborde J, Thompson K (2013) Colonization of limestone grasslands by woody plants: The role of seed limitation and herbivory by vertebrates. J Veg Sci 24:307–319
Lee M, Manning P, Rist J, Power SA, Marsh C (2010) A global comparison of grassland biomass responses to CO2 and nitrogen enrichment. Phil Trans Biol Sci 365:2047–2056
Loydi A, Eckstein RL, Otte A, Donath TW (2013) Effects of litter on seedling establishment in natural and semi-natural grasslands: a meta-analysis. J Ecol 101:454–464
Mazia N, Tognetti PM, Cirino ED (2013) Patch identity and the spatial heterogeneity of woody encroachment in exotic-dominated old-field grasslands. Plant Ecol 214:267–277
Millennium Ecosystem Assessment (2006) Millennium Ecosystem Assessment Synthesis Reports
Monk C, Gabrielson F (1985) Effects of shade, litter and root competition on old-field vegetation in South-Carolina. Bull Torr Bot Club 112:383–392
Obroucheva NV (2012) Transition from hormonal to nonhormonal regulation as exemplified by seed dormancy release and germination triggering. Russ J Plant Physiol 59:546–555
Ostfeld RS, Canham CD (1993) Effects of meadow vole population-density on tree seedling survival in old fields. Ecology 74:1792–1801
Pantera A, Papanastasis VP (2012) Competitive effects of herbaceous species on water potential and growth of Quercus ithaburensis spp. Macrolepis seedlings. Glob Nest J 14:525–531
Putz F, Canham C (1992) Mechanisms of arrested succession in shrublands—root and shoot competition between shrubs and tree seedlings. Forest Ecol Management 49:267–275
Shaver G, Chapin F (1995) Long-term responses to factorial, NPK fertilizer treatment by alaskan wet and moist tundra sedge species. Ecography 18:259–275
Turner MM, Henry HAL (2009) Interactive effects of warming and increased nitrogen deposition on 15N tracer retention in a temperate old field: seasonal trends. Global Change Biol 15:2885–2893
Vandenberghe C, Frelechoux F, Gadallah F, Buttler A (2006) Competitive effects of herbaceous vegetation on tree seedling emergence, growth and survival: does gap size matter? J Veg Sci 7:481–488
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This research was supported by a Natural Sciences and Engineering Research Council of Canada Discovery Grant awarded to H.A.L.H.
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Communicated by L. Rigg.
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McWhirter, B.D., Henry, H.A.L. Successional processes and global change: tree seedling establishment in response to warming and N addition in a temperate old field. Plant Ecol 216, 17–26 (2015). https://doi.org/10.1007/s11258-014-0413-0
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DOI: https://doi.org/10.1007/s11258-014-0413-0