03977nab a2200337 i 4500003000900000005001700009008004100026040001800067072000800085100003900093100002900132100002800161100003800189100005000227100004000277100002900317100003500346245009800381500007700479520125800556520144001814650002203254650002303276650001703299650001303316650001503329773018903344856007903533942000803612999001903620BR-BrBNA20260311115125.0260311b2018    bl.qr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aF61  aSilva, Ágatha Maria de Oliveira   aFreire, Fernando José   aBarbosa, Mozart Duarte   aFerreira, Rinaldo Luiz Caraciolo   aFreire,  Maria Betânia Galvão dos Santos   aAlves Junior, Francisco Tarcísio   aFreire, Clarissa Soares   aSilva, Ane Cristine Fortes da   aCompartmentalization and efficiency biological of nitrogen utilization in dry tropical forest  a

Publicação online; 24 ref.; 5 tables; 2 illus.; Summaries (En, Pt)  a


ABSTRACT     :Studies of nutrient efficiency and compartmentalization of nutrients in dry forests can contribute to the understanding of the nutrition of these forests because significant nutrient depositions come from leaf and branch fractions and are mostly derived from leguminous species, emphasizing the importance of nitrogen in cycling of these environments. This work aimed to determine the compartmentalization and efficiency biological of nitrogen utilization of the forest species with the highest importance value in a fragment of Caatinga hiperxerófila in Pernambuco. In the species was estimated the leaf biomass, using allometric equations. Leaves and stem parts were sampled for determination of nitrogen content. The biological utilization efficiency was calculated for each species. The biomass of the stem was 10.12 kg plant-1 and of the leaf was 0.99 kg plant-1. Higher N contents were observed in the leaves and stem of Poincianella bracteosa, associated to the high biomass of the species. The most efficient species to use nitrogen were Myracrodruon urundeuva and Bauhinia cheilantha, which could be indicated for areas with low levels of organic matter.  


Key words:      forest nutrition; forest biomass; nitrogen conten  a


RESUMO:     Estudos de eficiência nutricional e compartimentalização de nutrientes em florestas secas podem contribuir para compreensão da nutrição dessas florestas porque deposições significativas de nutrientes são oriundas das frações folhas e galhos e são provenientes, em sua maioria, de espécies leguminosas, ressaltando a importância do nitrogênio na ciclagem nutricional desses ambientes. Este trabalho objetivou determinar a compartimentalização e eficiência de utilização biológica de nitrogênio das espécies florestais com maior valor de importância em fragmento de Caatinga hiperxerófila em Pernambuco. Nas espécies foi estimada a biomassa foliar, utilizando-se equações alométricas. Foram amostradas folhas e partes do caule para a determinação do teor de nitrogênio. A eficiência de utilização biológica foi calculada para cada espécie. A biomassa do caule foi de 10,12 kg planta-1 e da folha de 0,99 kg planta-1. Maiores conteúdos de N foram observados nas folhas e caule da Poincianella bracteosa, associado à elevada biomassa da espécie. As espécies mais eficientes em utilizar nitrogênio foram Myracrodruon urundeuva e Bauhinia cheilantha podendo ser indicadas para áreas com diagnóstico de baixos teores de matéria orgânica.  


 Palavras-chave:      nutrição florestal; biomassa florestal; conteúdo de nitrogênio  aFLORESTA TROPICAL  aNUTRICÃO VEGETAL  aNITROGÊNIO  aBIOMASSA  aPERNAMBUCO0 046569360535dRecife-PE Universidade Federal Rural de Pernambuco 2006o2026-0919tRevista Brasileira de Ciências Agrárias (Brazil)x1981-1160gv. 13(2) p. 1-8; (2018)wBR2025005668  uhttp://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v13i2a5519/336  cANA  c340353d340353