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000858850.pdf: 4113198 bytes, checksum: 7a229197c9cf848ced52da67c1163244 (MD5) / A avaliação da regeneração natural dos ecossistemas é importante porque permite entender a sucessão natural e determina se os esforços para recuperar a estabilidade e integridade biológica estão-sendo efetivos. Na regeneração natural dos ecossistemas, a disponibilidade de sementes é um fator importante para a sobrevivência e persistência da comunidade vegetal dentro do hábitat. Assim, o banco e a chuva de sementes têm sido considerados como os principais processos para a manutenção das comunidades vegetais. O objetivo do presente estudo foi avaliar a importância da dispersão e persistência de sementes no banco do solo na dinâmica de regeneração da comunidade vegetal em diferentes sistemas de restauração da floresta estacional semidecidual. O estudo foi realizado em duas áreas experimentais de Botucatu (São Paulo), cada uma contendo características diferentes de solo. Em cada área, há 18 anos, foram implantados cinco sistemas de restauração sob um delineamento em blocos com três repetições, e parcelas de 50 x 50 m, sendo: a) semeadura direta (SEMD), b) sistema agroflorestal (SAF), c) consórcio de espécies para madeira e lenha (COML), e) plantio diversificado (PDIV) e f) restauração passiva (controle) (RPSV). Além disso, foi avaliado um fragmento de floresta natural (FRAG) nas duas áreas como ecossistema de referência. Para o estudo da chuva de sementes, foram instalados, em cada parcela, ... / The assessment of natural regeneration is important to understanding the successional trajectory of restored ecosystems and determining if the efforts to restore the stability and biological integrity are being effective. Seed availability is an important factor for the survival and persistence of plant community within the habitat. Thereby, seeds bank and seeds rain have been considered as the principal processes for plant communities maintenance. The aim of this study was to evaluate the role of the soil seed bank and the seed rain for the regeneration dynamics of plant communities under different seasonal semi-deciduous forest restoration systems. The study was undertaken in two experimental sites at Botucatu county (São Paulo), each one havind contrasting soil characteristics. Five restoration systems were stablished in 1997-1998, in a random block design with three replications in each site, with 50 x 50 m plots. Treatments were: a) direct seeding (SEMD), b) agroforestry system (SAF), c) timber and firewood mixed species plantation(COML), e) high-diversity plantation (PDIV) and f) passive restoration as control (RPSV). Furthermore, a natural forest fragment (FRAG) was evaluated in each area as a reference ecosystem. Soil samples were collected at 5 cm deepth (8 samples perplots), in order to analyse the seed bank by the germination method, respectively during the rainy and dry seasons. Soil samples were installed in germination boxes at the nursery. Sedling emergence was monitored during six months. For the seed rain study, 4 circular traps of 0.25 m² were installed in each plot, and the seeds were collected monthly during one year. The seed bank was composed mainly by herbaceous species in all restoration systems, comprinsing 83% and 73% of species for areas 1 and 2 respectively. The seed bank average density was 632.29 and 794.61 seeds / m², for areas 1 and 2, respectively. The highest dens ...
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/135978 |
| Date | 11 September 2015 |
| Creators | Villota Cerón, Diana Elizabeth [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Engel, Vera Lex [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | xi, 130 f. : il. color., grafs., tabs |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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