Do subtropical grasslands recover spontaneously after afforestation?  

作　　者：Fábio Piccin Torchelsen Monica Cadenazzi Gerhard Ernst Overbeck 

机构地区：[1]Departamento de Botânica,Instituto de Biociências,Universidade Federal do Rio Grande do Sul-UFRGS,Av.Bento Gonçalves 9500-Bloco IV-Prédio 43433,Porto Alegre,RS,CEP 91501-970,Brazil [2]Facultad de Agronomía,Universidad de La Republica-UdelaR,Paysandú,Uruguay

出　　处：《Journal of Plant Ecology》2019年第2期228-234,共7页植物生态学报（英文版）

基　　金：We thank the Fundação Grupo Boticário de ProteçãoàNatureza,Brazil(grant 0950_20122 to GEO);CAPES,Brazil(CAPES/UDELAR cooperation between GEO and MC,grant 048/2013 to GEO),for funding of the research that led to this paper;FPT received a Doctorate grant from CAPES.GEO receives support from CNPq(310022/2015-0).

摘　　要：Aims South American Pampa grasslands are habitats of great conservation interest,with a distinct and rich flora,but have been intensely con-verted to other land uses,including tree plantations.While neces-sity for restoration grows,no information on restoration potential of grasslands after afforestation exists.Here,we aim at analyzing composition and structure of grassland vegetation with a history of eucalyptus plantations in order to assess recovery potential of these areas.We hypothesized that areas with history of eucalyptus would differ from reference grasslands with no history of land-use change in terms of floristic and functional composition and would present lower species richness.Methods Our study region comprised four sites in the southeastern part of the Pampa biome,in the coastal plain in the extreme south of Brazil,always with sites with long(50 years)history of eucalyptus plantation and reference grassland.We sampled vegetation at post-eucalyptus sites(with and without resprouting)10 years after clear-clutting and in natural grasslands.We analyzed data by analysis of variance and ordination techniques,considering compositional parameters and life forms,and indicator species analysis.Important Findings Species richness and vegetation cover were higher in reference grassland than in resprout areas but did not differ from post-eucalyp-tus areas.Exotic species cover was significantly higher in areas with afforestation history.In terms of total composition,natural grasslands differed significantly from areas with past plantation use.Indicator species analyses revealed considerable differences between grass-land types.In conclusion,vegetation development led to grassland communities that are still quite distinct from reference sites.Likely,the specificity of grassland management has a high importance in defining vegetation trajectories in time and importance for grassland recovery,and restoration needs to be addressed in more studies.

关 键 词：Campos Sulinos CONSERVATION PAMPA RESTORATION southern Brazil vegetation management 

分 类 号：S71[农业科学—林学]