Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment

Kyle W. Tomlinson, Frank J. Sterck, Eduardo R.M. Barbosa, Steven de Bie, Herbert H.T. Prins, Frank van Langevelde

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Changes in savanna tree species composition, both within landscapes and across climatic gradients, suggest that species differ in their ability to utilize resources and cope with grass competition. Linking trait variation among species to their relative performance under resource limitation and competition treatments could provide mechanistic understanding of species’ turnover across environmental gradients in savannas. We investigated how tree species differ in response to competition from grasses and nutrient supply, and whether these responses can be related to plant traits. As humid savannas are often associated with low fertility, species of humid savannas may grow more efficiently under nutrient suppression than species from semi-arid savannas. In heterogeneous grass swards, fast-growing, resource-wasteful species may be found in low grass biomass patches and slow-growing, conservative species in high biomass patches. We compared seedlings of 40 tree species sampled from humid and semi-arid savannas of three continents (Africa, Australia, South America) with and without grass competition and with high and low nutrient supply. We measured traits related to soil resource capture, light capture, and growth, and tested whether these traits were related to performance under the four treatments. All tree species were suppressed by grass competition and most by nutrient limitation. Only species from humid savannas in Australia grew better under nutrient limitation than their semi-arid counterparts. Deciduous species from semi-arid climates were more negatively impacted by grass competition than deciduous species from humid climates whereas the reverse pattern was observed among evergreen species. Faster growing species were more severely suppressed by grass competition and low nutrients than slower growing species. Traits associated with soil resource capture and seed mass supported growth under grass competition and nutrient limitation, but the traits differed by continent and by leaf habit. Synthesis. We found limited evidence that tree seedlings from humid savannas grow better under nutrient limitation than species of semi-arid savannas. We confirmed that fast-growing species may be advantaged in low grass biomass patches and conservative species in high biomass patches. Traits that improved performance under grass competition differed by continent, which may relate to differences in leaf habit and constraints on seed size.

LanguageEnglish
Pages1051-1066
JournalJournal of Ecology
Volume107
Issue number3
Early online date16 Oct 2018
DOIs
Publication statusPublished - May 2019

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nutrient limitation
greenhouse experimentation
savanna
seedling growth
savannas
seedling
grass
grasses
nutrients
experiment
soil resources
biomass
continent
humid zones
seedlings
nutrient
semiarid zones
sward
seeds
leaves

Keywords

  • determinants of plant community diversity and structure
  • grass competition
  • humid savanna
  • seedling
  • semi-arid savanna
  • soil nutrients
  • traits

Cite this

@article{3b6f5a777b7c4685b379a848665fd4b6,
title = "Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment",
abstract = "Changes in savanna tree species composition, both within landscapes and across climatic gradients, suggest that species differ in their ability to utilize resources and cope with grass competition. Linking trait variation among species to their relative performance under resource limitation and competition treatments could provide mechanistic understanding of species’ turnover across environmental gradients in savannas. We investigated how tree species differ in response to competition from grasses and nutrient supply, and whether these responses can be related to plant traits. As humid savannas are often associated with low fertility, species of humid savannas may grow more efficiently under nutrient suppression than species from semi-arid savannas. In heterogeneous grass swards, fast-growing, resource-wasteful species may be found in low grass biomass patches and slow-growing, conservative species in high biomass patches. We compared seedlings of 40 tree species sampled from humid and semi-arid savannas of three continents (Africa, Australia, South America) with and without grass competition and with high and low nutrient supply. We measured traits related to soil resource capture, light capture, and growth, and tested whether these traits were related to performance under the four treatments. All tree species were suppressed by grass competition and most by nutrient limitation. Only species from humid savannas in Australia grew better under nutrient limitation than their semi-arid counterparts. Deciduous species from semi-arid climates were more negatively impacted by grass competition than deciduous species from humid climates whereas the reverse pattern was observed among evergreen species. Faster growing species were more severely suppressed by grass competition and low nutrients than slower growing species. Traits associated with soil resource capture and seed mass supported growth under grass competition and nutrient limitation, but the traits differed by continent and by leaf habit. Synthesis. We found limited evidence that tree seedlings from humid savannas grow better under nutrient limitation than species of semi-arid savannas. We confirmed that fast-growing species may be advantaged in low grass biomass patches and conservative species in high biomass patches. Traits that improved performance under grass competition differed by continent, which may relate to differences in leaf habit and constraints on seed size.",
keywords = "determinants of plant community diversity and structure, grass competition, humid savanna, seedling, semi-arid savanna, soil nutrients, traits",
author = "Tomlinson, {Kyle W.} and Sterck, {Frank J.} and Barbosa, {Eduardo R.M.} and {de Bie}, Steven and Prins, {Herbert H.T.} and {van Langevelde}, Frank",
year = "2019",
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language = "English",
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Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment. / Tomlinson, Kyle W.; Sterck, Frank J.; Barbosa, Eduardo R.M.; de Bie, Steven; Prins, Herbert H.T.; van Langevelde, Frank.

In: Journal of Ecology, Vol. 107, No. 3, 05.2019, p. 1051-1066.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment

AU - Tomlinson, Kyle W.

AU - Sterck, Frank J.

AU - Barbosa, Eduardo R.M.

AU - de Bie, Steven

AU - Prins, Herbert H.T.

AU - van Langevelde, Frank

PY - 2019/5

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AB - Changes in savanna tree species composition, both within landscapes and across climatic gradients, suggest that species differ in their ability to utilize resources and cope with grass competition. Linking trait variation among species to their relative performance under resource limitation and competition treatments could provide mechanistic understanding of species’ turnover across environmental gradients in savannas. We investigated how tree species differ in response to competition from grasses and nutrient supply, and whether these responses can be related to plant traits. As humid savannas are often associated with low fertility, species of humid savannas may grow more efficiently under nutrient suppression than species from semi-arid savannas. In heterogeneous grass swards, fast-growing, resource-wasteful species may be found in low grass biomass patches and slow-growing, conservative species in high biomass patches. We compared seedlings of 40 tree species sampled from humid and semi-arid savannas of three continents (Africa, Australia, South America) with and without grass competition and with high and low nutrient supply. We measured traits related to soil resource capture, light capture, and growth, and tested whether these traits were related to performance under the four treatments. All tree species were suppressed by grass competition and most by nutrient limitation. Only species from humid savannas in Australia grew better under nutrient limitation than their semi-arid counterparts. Deciduous species from semi-arid climates were more negatively impacted by grass competition than deciduous species from humid climates whereas the reverse pattern was observed among evergreen species. Faster growing species were more severely suppressed by grass competition and low nutrients than slower growing species. Traits associated with soil resource capture and seed mass supported growth under grass competition and nutrient limitation, but the traits differed by continent and by leaf habit. Synthesis. We found limited evidence that tree seedlings from humid savannas grow better under nutrient limitation than species of semi-arid savannas. We confirmed that fast-growing species may be advantaged in low grass biomass patches and conservative species in high biomass patches. Traits that improved performance under grass competition differed by continent, which may relate to differences in leaf habit and constraints on seed size.

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KW - grass competition

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KW - seedling

KW - semi-arid savanna

KW - soil nutrients

KW - traits

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