Estratifica??o do topsoil em camadas para aplica??o na restaura??o florestal: funciona?

Autor: Pinheiro, Andr? C?sar
Přispěvatelé: Pereira, Israel Marinho, Oliveira, Marcio Leles Romarco de, Machado, Evandro Luiz Mendon?a, Guimar?es, Jo?o Carlos Costa, Nunes, Yule Roberta Ferreira, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
Jazyk: portugalština
Rok vydání: 2022
Předmět:
Zdroj: Repositório Institucional da UFVJM
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
instacron:UFVJM
Popis: O orientador do trabalho n?o mencionado na lista da Folha de Aprova??o. Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-08-11T17:49:17Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) andre_cesar_pinheiro.pdf: 2585938 bytes, checksum: cde351d3255cf7b1191bde4ff506979d (MD5) Approved for entry into archive by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-08-11T17:50:17Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) andre_cesar_pinheiro.pdf: 2585938 bytes, checksum: cde351d3255cf7b1191bde4ff506979d (MD5) Made available in DSpace on 2022-08-11T17:50:17Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) andre_cesar_pinheiro.pdf: 2585938 bytes, checksum: cde351d3255cf7b1191bde4ff506979d (MD5) Previous issue date: 2022 Este estudo teve como objetivo avaliar o potencial de uso do banco de sementes para restaura??o florestal no dom?nio da Mata Atl?ntica, e responder sobre qual profundidade do solo a ser coletada quando se objetiva acelerar o processo de sucess?o por meio do resgate e transposi??o do banco de sementes na restaura??o florestal; e se vale a pena estratificar verticalmente as camadas quando da remo??o e, ou aplica??o do topsoil em campo. A ?rea de estudo est? localizada na borda leste da Serra do Espinha?o Meridional. A primeira etapa deste estudo consistiu na amostragem do banco de sementes de um trecho (50 ?50 m) de Floresta Estacional Semidecidual em est?gio m?dio de regenera??o que foi destinado ? supress?o da vegeta??o. Dentro deste trecho, coletou-se partes do banco de sementes composto pela serapilheira e duas amostras de solo nas profundidades de 0-5 e 5-10 cm, em 12 pontos aleat?rios anterior ? supress?o da vegeta??o. Ap?s a supress?o, removeu-se a camada superficial do solo (?30 cm) e armazenou-se por seis meses em campo, sendo coletada a outra amostra do banco de sementes logos ap?s a transfer?ncia do topsoil para a ?rea receptora (?rea a ser restaurada). A segunda etapa consistiu em um experimento realizado em ambiente controlado (casa de vegeta??o), na qual o banco de sementes foi avaliado em cinco tratamentos, sendo: T1 = camada de serapilheira; T2 = camada de 0-5 cm de solo; T3 = 5-10 cm de solo; T4 = camada de 0-10 cm solo + serapilheira; e T5 = topsoil p?s-transfer?ncia (camada de 0-30 cm + serapilheira, armazenado em campo). Ap?s dois anos, avaliou-se as vari?veis: riqueza e composi??o de esp?cies e a densidade de plantas (n? de plantas.m-2). No total, registrou-se a densidade de 90 plantas.m-2 e 21 esp?cies distribu?das em 11 fam?lias bot?nicas. A densidade m?dia e riqueza espec?fica n?o foram significativas entre as diferentes camadas avaliadas. Isso se deve ? ampla heterogeneidade espacial do banco de sementes, que se traduz em uma grande varia??o dos dados. Para comparar a composi??o flor?stica dos tratamentos do banco de sementes, foi utilizado os ?ndices de similaridade de S?rensen e Bray-Curtis. Considerando todo o conjunto de dados, para ambos os ?ndices, a similaridade flor?stica foi considerada alta para a maioria dos tratamentos. Os resultados deste estudo demonstraram que o topsoil, se coletado at? 30 cm de profundidade, incluindo a serapilheira, apresenta o mesmo potencial para uso em t?cnicas de restaura??o florestal, independentemente da estratifica??o das camadas do banco de sementes. Tese (Doutorado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2022. This study aimed to evaluate the potential use of the seed bank for forest restoration in the Atlantic Forest domain, and to answer about which soil depth to be collected when the objective is to accelerate the succession process through the rescue and transposition of the seed bank in forest restoration; and whether it is worthwhile to vertically stratify the layers when removing and/or applying topsoil in the field. The study area is located on the eastern edge of the Serra do Espinha?o Meridional. The first stage of this study consisted of sampling the seed bank of a stretch (50 ?50 m) of Seasonal Semideciduous Forest in medium stage of regeneration that was destined to suppress vegetation. Within this stretch, parts of the seed bank composed of litter and two soil samples were collected at depths of 0-5 and 5-10 cm, at 12 random points prior to the suppression of vegetation. Within this stretch, parts of the seed bank composed of litter and two soil samples were collected at depths of 0-5 and 5-10 cm, at 12 random points prior to the suppression of vegetation. After suppression, the surface layer of the soil (?30 cm) was removed and stored for six months in the field, and another sample was collected from the seed bank soon after the transfer of the topsoil to the receiving area (area to be restored). The second stage consisted of an experiment carried out in a controlled environment (greenhouse), in which the seed bank was evaluated in five treatments, as follows: T1 = litter layer; T2 = 0-5 cm layer of soil; T3 = 5-10 cm of soil; T4 = 0-10 cm layer of soil + litter; and T5 = post-transfer topsoil (0-30 cm layer + litter, stored in the field). After two years, the following variables were evaluated: species richness and composition and plant density (number of plants.m-2). In total, the density of 90 plants.m-2 and 21 species distributed in 11 botanical families were recorded. The average density and specific richness were not significant between the different layers evaluated. This is due to the wide spatial heterogeneity of the seed bank, which translates into a wide variation in the data. To compare the floristic composition of the seed bank treatments, the S?rensen and Bray-Curtis similarity indices were used. Considering the entire dataset, for both indices, floristic similarity was considered high for most treatments. The results of this study demonstrated that topsoil, if collected up to 30 cm depth, including litter, has the same potential for use in forest restoration techniques, regardless of the stratification of the seed bank layers.
Databáze: OpenAIRE
Externí odkaz: