Details

Autor(en) / Beteiligte

• Souza, Anderson Fernandes
• Rocha, Elio de Oliveira, Jr
• Laura, Valdemir Antonio

Titel

EARLY DEVELOPMENT AND EFFICIENCY IN WATER AND NITROGEN USE BY SEEDLINGS OF Calophyllum brasiliense, Eucalyptus urograndis, Tabebuia impetiginosa AND Toona ciliata/DESENVOLVIMENTO INICIAL E EFICIENCIA DE USO DE AGUA E NITROGENIO POR MUDAS DE Calophyllum brasiliense, Eucalyptus urograndis, Tabebuia impetiginosa E Toona ciliata

Ist Teil von

• Ciência florestal, 2018-10, Vol.28 (4), p.1465

Ort / Verlag

Universidade Federal de Santa Maria

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The knowledge about the early development of seedlings is critical to the success of reforestation and planting in natural forests. The aim of this study was to evaluate the initial development and efficiency of water and nitrogen use by seedlings of four native and exotic species (Calophyllum brasiliense (native), Eucalyptus urograndis (exotic), Toona ciliata (exotic) and Tabebuia impetiginosa (native)) with age of approximately 120 days after sowing for 120 days after transplantation in green-house conditions. Destructive samples were carried out to assess the dry biomass (Leaf, Stem, Root and Total), leaf area, the root shoot ratio and total nitrogen in seedlings. Based on these variables, it was calculated the physiological parameters of growth and efficiency of water use, which was obtained by the ratio between the total dry biomass accumulation and evapotranspiration of vessels in the period, determined by daily weighing in a balance bench. At the end of 240 days after sowing, Calophyllum brasiliense and Tabebuia impetiginosa produced more total biomass and Toona ciliata showed higher root shoot ratio. There were no differences between the relative growth rate of the species evaluated. Eucalyptus urograndis, Toona ciliata and Calophyllum brasiliense showed the highest values of leaf area ratio, Toona ciliata, Tabebuia impetiginosa and Eucalyptus urograndis showed the highest values of specific leaf area, Eucalyptus urograndis and Calophyllum brasiliense show the highest values for leaf mass ratio and Tabebuia impetiginosa, Toona ciliata and Eucalyptus urograndis showed the highest values of net assimilation rate. Based on quantification of total nitrogen, Tabebuia impetiginosa and Toona ciliata were the most efficient species in the use of nitrogen. Eucalyptus urograndis presented the highest evapotranspiration while Calophyllum brasiliense and Tabebuia impetiginosa were the most efficient species in water use. Keywords: growth analysis; water consumption; forest species; native species. O conhecimento sobre o desenvolvimento inicial das mudas e fundamental para o sucesso de atividades de reflorestamento e de plantio em florestas naturais. O objetivo deste trabalho foi avaliar o desenvolvimento inicial e a eficiencia de uso de agua e nitrogenio por mudas de quatro especies florestais nativas e exoticas (Calophyllum brasiliense (nativa), Eucalyptus urograndis (exotica), Toona ciliata (exotica) e Tabebuia impetiginosa (nativa)) com idade de aproximadamente 120 dias apos a semeadura por 120 dias apos o transplante em condicoes de casa de vegetacao. Foram realizadas amostragens destrutivas para avaliar a biomassa seca (folha, caule, raiz e total), area foliar, relacao raiz/parte aerea e nitrogenio total nas mudas. Com base nessas variaveis, foram calculados os parametros fisiologicos de crescimento e a eficiencia de uso de agua, que foi obtida pela razao entre o total de biomassa seca acumulada e a evapotranspiracao dos vasos no periodo, determinada atraves de pesagens diarias em balanca de bancada. Ao final de 240 dias apos a semeadura, Calophyllum brasiliense e Tabebuia impetiginosa apresentaram maior producao de biomassa seca total e Toona ciliata apresentou maior relacao raiz/parte aerea. Nao houve diferencas entre a taxa de crescimento relativo das especies avaliadas. Eucalyptus urograndis, Toona ciliata e Calophyllum brasiliense apresentaram os maiores valores de razao de area foliar, Toona ciliata, Tabebuia impetiginosa e Eucalyptus urograndis apresentaram os maiores valores de area foliar especifica, Eucalyptus urograndis e Calophyllum brasiliense apresentam os maiores valores para razao de massa foliar e Tabebuia impetiginosa, Toona ciliata e Eucalyptus urograndis apresentaram os maiores valores de taxa de assimilacao liquida. Com base na quantificacao do nitrogenio total, Tabebuia impetiginosa e Toona ciliata foram as especies mais eficientes no uso do nitrogenio. Eucalyptus urograndis apresentou a maior evapotranspiracao enquanto Calophyllum brasiliense e Tabebuia impetiginosa foram as especies mais eficientes no uso de agua. Palavras-chave: analise de crescimento; consumo de agua; especies florestais; especies nativas.