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http://hdl.handle.net/1843/36167
Type: | Tese |
Title: | Ecologia do banco de sementes do solo de campos rupestres: efeito da altitude, do solo, do clima e do fogo |
Authors: | Giovana Rodrigues da Luz |
First Advisor: | Geraldo Wilson Afonso Fernandes |
First Co-advisor: | Yule Roberta Ferreira Nunes |
First Referee: | Alberto Lopes Teixido |
Second Referee: | Islaine Franciely P. de Azevedo |
Third Referee: | Gislene Carvalho de Castro |
metadata.dc.contributor.referee4: | Yumi Oki |
Abstract: | The objective of this study was to determine the species richness and abundance of the seed bank and the influence of soil attributes along an elevation gradient (800–1400m a.s.l.). We examined the floristic similarity among areas and determined the regional diversity along this gradient in Serra do Cipo (Minas Gerais, Brazil). A total of 1975 individuals from 149 species were germinated. Richness and abundance were not linearly related to elevation, and exhibited a threshold at 1200 m. The low degree of similarity among the areas reflects environmental heterogeneity, resulting from a rich mosaic of habitats, distinguished by the substrate configuration, continuity of vegetation, floristic composition, and proportion of exposed rock. The diversity between plots of different areas (β2) contributed to regional diversity, and species turnover was the most important factor. The physical variables and base saturation, which had high spatial heterogeneity, may be the most important factors with which to determine species turnover and β diversity. The studied seed bank is strongly influenced by edaphic variables, with a gradient of increasing acidity and proportion of fine sand, and decreasing proportion of clay and organic matter, with elevation. In addition, species richness was influenced by cation exchange capacity, organic matter, and clay; and abundance was influenced by cation exchange capacity, H + Al, organic matter, and base saturation. |
Abstract: | L’objectif de cette etude etait de determiner la richesse et l’abondance en especes d’une banque de semences et l’influence des attributs du sol le long d’un gradient d’elevation (800–1400 m a.s.l.). Les auteurs ont examine la similarite floristique entre les regions et determine la diversite regionale le long de ce gradient dans la Sierra do Cipo (Minas Gerais, Bresil). Un total de 1975 individus appartenant a 149 especes a ete conduit jusqu’a la germination. La richesse et l’abondance en especes n’etaient pas reliees de facon lineaire a l’elevation et elles atteignaient un seuil a 1200 m. Le faible degre de similarite entre les regions reflete l’heterogeneite environnementale resultant d’une riche mosaique d’habitats qui se distinguent par la configuration du substrat, la continuite de la vegetation, la composition floristique et la proportion de roche exposee. La diversite entre les lots de differentes regions (β2) contribuait a la diversite regionale, et le renouvellement des especes en constituait le facteur le plus important. Les variables physiques et la saturation basique, qui presentaient une heterogeneite spatiale elevee, pourraient etre les facteurs les plus importants qui determinent le renouvellement des especes et la diversite β. La banque de semis etudiee est fortement influencee par les variables edaphiques, le gradient d’acidite et la proportion de sable fin etant croissants et la proportion d’argile et la matiere organique, decroissantes, en fonction de l’elevation. Par ailleurs, la richesse en especes etait influencee par la capacite d’echange cationique, la matiere organique et l’argile, et l’abondance, par la capacite d’echange cationique, H + Al, la matiere organique et la saturation basique. |
Subject: | Ecologia Banco de sementes Solo |
language: | eng |
metadata.dc.publisher.country: | Brasil |
Publisher: | Universidade Federal de Minas Gerais |
Publisher Initials: | UFMG |
metadata.dc.publisher.department: | ICB - INSTITUTO DE CIÊNCIAS BIOLOGICAS |
metadata.dc.publisher.program: | Programa de Pós-Graduação em Ecologia, Conservacao e Manejo da Vida Silvestre |
Rights: | Acesso Aberto |
metadata.dc.rights.uri: | http://creativecommons.org/licenses/by-nc-nd/3.0/pt/ |
URI: | http://hdl.handle.net/1843/36167 |
Issue Date: | 27-Apr-2018 |
Appears in Collections: | Teses de Doutorado |
Files in This Item:
File | Description | Size | Format | |
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Tese - Giovana Luz.pdf | 2.78 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License