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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, Frank1,4
2019
Source PublicationJOURNAL OF ECOLOGY
ISSN0022-0477
Volume107Issue:3Pages:1051-1066
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.

KeywordBIOMASS ALLOCATION WATER-STRESS EVERGREEN CLIMATE DETERMINANTS TRAITS DIFFER FIRE CARBOHYDRATE VARIABILITY
Subject AreaPlant Sciences ; Environmental Sciences & Ecology
DOI10.1111/1365-2745.13085
Indexed BySCI
Language英语
WOS IDWOS:000467417500003
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11327
Collection2012年后新成立研究组
Affiliation1.[Tomlinson, Kyle W.] Chinese Acad Sci, Ctr Integrat Conservat, Xishuangbanna Trop Bot Garden, Menglun, Peoples R China
2.Wageningen Univ, Resource Ecol Grp, Wageningen, Netherlands
3.Sterck, Frank J.] Wageningen Univ, Forest Ecol & Management Grp, Wageningen, Netherlands
4.Barbosa, Eduardo R. M.] Univ Brasilia, Inst Ciencias Biol, Dept Bot, Lab Termobiol, Brasilia, DF, Brazil
5.Univ KwaZulu Natal, Sch Life Sci, Durban, South Africa
Recommended Citation
GB/T 7714
Tomlinson, Kyle W.,Sterck, Frank J.,Barbosa, Eduardo R. M.,et al. Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment[J]. JOURNAL OF ECOLOGY,2019,107(3):1051-1066.
APA Tomlinson, Kyle W.,Sterck, Frank J.,Barbosa, Eduardo R. M.,de Bie, Steven,Prins, Herbert H. T.,&van Langevelde, Frank.(2019).Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment.JOURNAL OF ECOLOGY,107(3),1051-1066.
MLA Tomlinson, Kyle W.,et al."Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment".JOURNAL OF ECOLOGY 107.3(2019):1051-1066.
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