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Previous issue date: 2015-12-15 / Apesar da import?ncia do estudo sobre ra?zes, pouco se sabe sobre os efeitos negativos da compacta??o do solo no desenvolvimento esp?cies florestais da Caatinga. Nesse sentido, objetivou-se avaliar o crescimento inicial de Mimosa caesalpiniifolia, Tabebuia caraiba e Erythina velutina, em solo submetido a variados n?veis de compacta??o. O experimento foi conduzido em casa de vegeta??o localizada na Unidade Acad?mica Especializada em Ci?ncias Agr?rias da UFRN. Pra realiza??o do experimento, foi utilizado Latossolo Amarelo de textura franco-arenosa, proveniente da ?rea de experimenta??o florestal da Escola Agr?cola de Jundia? (EAJ) do munic?pio de Maca?ba-RN, em unidade experimental composta por tr?s an?is de PVC sobrepostos, de 10 cm de di?metro e 25 cm de altura, sendo o anel central o que sofreu a compacta??o. O delineamento experimental utilizado foi o de blocos casualizados, com seis repeti??es, sendo testados quatro n?veis de compacta??o do solo (1,35; 1,45; 1,60 e 1,80 kg.dm-?), avaliando-se as seguintes vari?veis: di?metro, altura, n?mero de folhas, massa seca da parte a?rea e do sistema radicular em cada camada dos vasos. No geral, as esp?cies M. caesalpiniifolia, T. caraiba e E. velutina tiveram o crescimento inicial favorecido pelo tratamento composto por solo n?o compactado. As esp?cies M. caesalpiniifolia e T. caraiba se mostraram relativamente resistente a compacta??o do solo, n?o sofrendo nenhuma redu??o significativa no crescimento radicular a densidade igual ou inferiores a 1,60 kg.dm-?, enquanto, E. velutina se mostrou suscept?vel aos efeitos da compacta??o do solo, apresentando altera??es significativas no crescimento radicular sob densidades de solo igual ou superiores a 1,45 kg.dm-?. O aumento da compacta??o do solo provocou o impedimento da expans?o da raiz pivotante no interior das unidades experimentais, promovendo o ac?mulo de ra?zes nas camadas superiores do solo para as esp?cies estudadas. O impedimento f?sico em subsuperf?cie alterou o crescimento a?reo inicial das esp?cies M. caesalpiniifolia e E. velutina, por?m n?o influenciou o crescimento a?reo das mudas de T. caraiba aos n?veis de compacta??o testados. / Despite the importance of the study of roots, little is known about the negative effects of soil compaction in the development of the Caatinga forest species. In this sense, the objective was to evaluate the initial growth of Mimosa caesalpiniifolia, Tabebuia caraiba and Erythina velutina in soil under varying levels of compression. The experiment was conducted in a greenhouse located at the Academic Unit Specialized in Agricultural Sciences, UFRN. To perform the experiment, was used Oxisoil of sandy loam texture, from forest trial Area Agricultural School of Jundia? (EAJ) of the municipality of Maca?ba-RN, in an experimental unit consisting of three overlapping PVC rings, 10 cm in diameter and 25 cm in height, with a central ring which has undergone compression. The experimental design was a randomized block with six replications, being tested four levels of soil compaction (1.35; 1.45; 1.60 and 1.80 kg.dm-?), evaluating the following variables: diameter, height, number of leaves, dry weight of shoot and root system in each layer of the vessels. Overall, the species M. caesalpiniifolia, T. caraiba and E. velutina had initial growth favored by treatment consists of uncompressed soil. The M. caesalpiniifolia and T. caraiba species proved relatively resistant to compaction of the soil does not undergo any significant reduction in root growth density equal to or less than 1.60 kg.dm-?, whereas E. velutina proved susceptible effects of soil compaction, with significant changes in root growth under soil densities equal to or greater than 1.45 kg.dm-?. Increased soil compaction caused the impediment to the expansion of taproot inside the experimental units, promoting the accumulation of roots in the upper layers of the soil for the studied species. The subsoil physical impediment changed the initial aerial growth of M. caesalpiniifolia and E. velutina, but did not influence the growth of air T. caraiba seedlings the tested compression levels.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20743 |
| Date | 15 December 2015 |
| Creators | Ara?jo, Luan Henrique Barbosa de |
| Contributors | 96823216468, http://lattes.cnpq.br/0029507073767618, Oliveira, Ermelinda Maria Mota, 96835028491, http://lattes.cnpq.br/6957940488708665, Miranda, Neyton de Oliveira, 30341647004, http://lattes.cnpq.br/6580689264232001, Silva, Gualter Guenther Costa da |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS FLORESTAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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