Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-05-23T18:59:15Z No. of bitstreams: 1 2015 - Maur?lio de Faria Vieira J?nior.pdf: 12406217 bytes, checksum: 65c909f188c2db69a7d90ee85f17b104 (MD5) / Made available in DSpace on 2017-05-23T18:59:15Z (GMT). No. of bitstreams: 1 2015 - Maur?lio de Faria Vieira J?nior.pdf: 12406217 bytes, checksum: 65c909f188c2db69a7d90ee85f17b104 (MD5) Previous issue date: 2015-08-26 / Knowledge on the relationship between soil and plant species is fundamental to restoration projects in view of the dynamics of succession, since the invasive species may turn the projects very expensive or impractical. Control practices of the invasive plant species based on natural conservation may add to recovery measures, thus reducing the costs and increasing their efficiency. The aims of this study were to investigate relationships between different soil types and the occurrence of thatch (Imperata brasiliensis) plants in two different areas on the IFRJ Pinheiral Campus (Pinheiral-RJ); and to evaluate the use of forage legumes and their efficiency in the control of the invasive vegetation, associated to the use of direct seeding and planting of seedlings in reforestation activities. Eight trenches were evaluated in two toposequences, through characterization of soil properties and dry mass of shoots and roots of thatch sampled in four soil layers, respectively 0-7, 7-14, 14-28 and 28-35 cm. The eight soil profiles were also classified according to the Brazilian system. There were evaluated the heights, diameters and survival of seedlings of five forest species, subject to two forms of planting, tillage and seedlings, and two planting densities of sunn hemp legumes, pigeon pea and pork beans, as well as the efficiency of these plants in reducing the weed competition. The soil properties did not influence the behavior of the dry mass of the thatch, and the difference between the dry weight of roots and shoots between the two toposequences is possibly due to shading by existing eucalyptus stand in the second area. The legume plants combination did not differ regarding the influence on the native species, neither on the weed control. There was significant difference only when compared the average of the four treatments. Possibly, the use of different legumes planting forms and conducting more experiments could show an increase in their efficiency. The planting method using seedlings of the forest species differed significantly and it was more efficient than the direct planting of the seeds, showing to be the most suitable for the local situation. / O conhecimento das rela??es entre o solo e as esp?cies vegetais ? fundamental para os projetos de restaura??o, tendo em vista a din?mica da sucess?o, j? que, esp?cies invasoras podem torn?-los muito onerosos ou inviabiliz?-los. Pr?ticas de controle das esp?cies invasoras com cunho conservacionista podem agregar-se ?s medidas de recupera??o, reduzindo custos e aumentando sua efici?ncia. Os objetivos do estudo foram averiguar a exist?ncia de rela??es entre diferentes tipos de solo e a ocorr?ncia do sap? (Imperata brasiliensis) em duas diferentes ?reas, nas depend?ncias do Campus Nilo Pe?anha/Pinheiral do IFRJ, Pinheiral-RJ; e avaliar a utiliza??o de leguminosas forrageiras e sua efici?ncia no controle da vegeta??o invasora em a??es de recomposi??o florestal, aliada ? semeadura direta e ao plantio de mudas de esp?cies arb?reas. Foram avaliadas oito trincheiras, em duas topossequ?ncias, por meio da caracteriza??o dos atributos do solo, bem como massa seca da parte a?rea e das ra?zes do sap? amostradas em quatro camadas (0-7, 7-14, 14-28 e 28-35 cm). Os perfis de solo (08) foram tamb?m classificados segundo o sistema brasileiro. Tamb?m foram avaliadas a altura, di?metro e a sobreviv?ncia das mudas de cinco esp?cies florestais, submetidas a duas formas de plantio, semeadura direta e por mudas, e duas densidades de plantio das leguminosas crotal?ria, guandu e feij?o de porco, bem como a efici?ncia destas no controle da matocompeti??o. Os atributos do solo n?o influenciaram nos resultados de massa seca do sap?, sendo a diferen?a entre a massa seca das ra?zes e da parte a?rea entre as duas topossequ?ncias possivelmente devida ao sombreamento pelo povoamento de eucalipto existente na segunda area. Os coquet?is de leguminosas n?o diferiram entre si quanto ? influ?ncia sobre as esp?cies nativas e quanto ao controle das invasoras. Somente a m?dia dos quatro tratamentos mostrou diferen?as significativas. Possivelmente, a utiliza??o de diferentes formas de plantio das leguminosas e m?todos de condu??o do experimento, poderia mostrar aumento na efici?ncia destas plantas. O m?todo de plantio de esp?cies florestais por mudas diferiu significativamente e foi mais eficiente que a semeadura direta, sendo o mais apropriado para a situa??o local.