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Changes in irradiance and soil properties explain why typical non-arboreal savanna species disappear under tree encroachment

dc.contributor.authorSouza Pinheiro, Luiz Felipe [UNESP]
dc.contributor.authorKolb, Rosana Marta [UNESP]
dc.contributor.authorRossatto, Davi Rodrigo [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-26T16:48:26Z
dc.date.available2018-11-26T16:48:26Z
dc.date.issued2016-01-01
dc.description.abstractSavanna vegetation maintains its openness and its diverse plant composition because of frequent fire events; however, when these are suppressed, encroachment is caused by increases in the tree density. In the neotropical savanna (cerrado of Brazil), typical forest trees are invading savanna areas, altering abiotic conditions and affecting the persistence of their exclusive species. Here we studied changes in abiotic conditions, species richness and diversity of a non-arboreal community (herbs, vines, grasses, subshrubs and shrubs) in a gradient of encroachment at a site where fire has been suppressed for more than 50 years in south-eastern Brazil. Encroached communities were more shaded and possessed a wetter and richer soil (higher contents of organic matter and P) compared with the typical savanna. These abiotic changes were related to a less rich and less diverse plant community in encroached savanna compared with typical savanna. The most important abiotic variables driving such changes were photosynthetically active radiation (PAR) reaching the understorey and soil P content: communities with lower species richness and diversity had lower PAR incidence and higher soil P content. Our results suggest that non-arboreal savanna species may be under serious threat of extinction given the expected ecological changes caused by the widespread expansion of forest on the savannas in the absence of fire.en
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias & Letras, Dept Ciencias Biol, Campus Assis,Av Dom Antonio 2100,Parque Univ, BR-19806900 Assis, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Biol, Campus Jaboticabal, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias & Letras, Dept Ciencias Biol, Campus Assis,Av Dom Antonio 2100,Parque Univ, BR-19806900 Assis, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Agr & Vet, Dept Biol, Campus Jaboticabal, BR-14884900 Jaboticabal, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2013/18049-6
dc.description.sponsorshipIdFAPESP: 2015/19771-2
dc.description.sponsorshipIdCNPq: 301589/2015-1
dc.format.extent333-341
dc.identifierhttp://dx.doi.org/10.1071/BT15283
dc.identifier.citationAustralian Journal Of Botany. Clayton: Csiro Publishing, v. 64, n. 4, p. 333-341, 2016.
dc.identifier.doi10.1071/BT15283
dc.identifier.fileWOS000379974100007.pdf
dc.identifier.issn0067-1924
dc.identifier.urihttp://hdl.handle.net/11449/161739
dc.identifier.wosWOS:000379974100007
dc.language.isoeng
dc.publisherCsiro Publishing
dc.relation.ispartofAustralian Journal Of Botany
dc.relation.ispartofsjr0,393
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectcrowding
dc.subjectherbs
dc.subjectsavanna
dc.subjectvegetation dynamics
dc.titleChanges in irradiance and soil properties explain why typical non-arboreal savanna species disappear under tree encroachmenten
dc.typeArtigo
dcterms.rightsHolderCsiro Publishing
unesp.departmentCiências Biológicas - FCLASpt

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