CARBON AND PHOSPHORUS BIOGEOCHEMICAL CYCLES IN NATIVE FOREST AND HORTICULTURAL AREAS IN THE METROPOLITAN REGION OF CURITIBA, BRAZIL
Palavras-chave:
bactérias solubilizadoras de P; uso intensivo do solo; matéria orgânica do solo; produção de hortaliças.Resumo
Este estudo foi conduzido para verificar se as diferentes frações de fosfato do solo afetam a biomassa microbiana do solo Amostras de solo foram coletadas em áreas de floresta nativa e horticultura, em quatro municípios da Região Metropolitana de Curitiba, Brasil, e avaliadas quanto a: carbono (C), nitrogênio (N) e fósforo (P) da biomassa microbiana (MBC , MBN e MBP, respectivamente), carbono orgânico total (TOC), nitrogênio total (TN), fósforo total (TP), fósforo inorgânico (iP), fósforo orgânico (oP) e fósforo disponível (aP), As suspensões de solo diluídas em 10-4 foram espalhadas em placas e as bactérias solubilizadoras de fosfato (PSB) foram contadas. As análises mostraram que os solos das áreas de horticultura acumularam 43% a mais de TP enquanto perderam 23% de TOC e 19% de TN em comparação com as áreas nativas. 69% do TP nas áreas nativas era orgânico (oP) enquanto 59% do TP nas áreas de horticultura era inorgânico (iP). As áreas de horticultura apresentaram menor número de unidades formadoras de colônias de PSB do que as áreas nativas. PSB foi positivamente correlacionado com a razão de MBC para TOC (qMic), que por sua vez, foi negativamente correlacionado com TOC e TN. Mudanças na fração de oP do solo sugeriram uma mudança na estrutura bacteriana da comunidade do solo e nos valores de biomassa microbiana do solo, o que pode ter contribuído para reduzir a material orgânica do solo nas áreas de horticultura.
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