Produção Nacional
Revisado por pares
Rhizosphere microbiological processes and eucalypt nutrition: Synthesis and conceptualization
2020; Elsevier BV; Volume: 746; Linguagem: Inglês
10.1016/j.scitotenv.2020.141305
ISSN1879-1026
AutoresRafael Vasconcelos Valadares, Maurício Dutra Costa, Júlio César Lima Neves, João Amaro Ferreira Vieira Netto, Ivo Ribeiro da Silva, Edemar Moro, Marcelo Rodrigo Alves, Luiz Arnaldo Fernandes,
Tópico(s)Plant responses to elevated CO2
ResumoIn this review, we present the state of art regarding rhizosphere effects on eucalypt plantations. It provides a greater understanding of carbon (C) and nitrogen (N) turnover in forest soils. P organic hydrolysis, soil mineral solubilization, indoleacetic acid, gibberellin, resistance factors, and production of siderophores by rhizosphere microbial populations help to explain the tolerance of Eucalyptus plants to biotic and abiotic stresses and the apparent steady-state condition of C and N soil stocks in many planted forests. This work aims to present the main findings on Eucalyptus rhizosphere processes and highlights their importance for trees nutrition, especially for N mineralization triggered by microbial activation or microbial community structure changes regarding the so-called rhizosphere priming effect and N fixation. Furthermore, we present an explanatory conceptual model of the steady-state condition for soil organic matter (SOM) stocks and its relation with fertilization based on a nutrient balance model. This review also considers the main experimental and modeling studies that demonstrate the quantitative importance of rhizosphere processes to Eucalyptus genus and their shortcomings. This provides a framework for process modeling under scenarios of global climate change. A better understanding of rhizosphere microbiological processes may allow improvements in Eucalyptus nutrition and production, as well as in accurate long-term estimates of SOM stocks and C-CO2 exchanges between forest soils and the atmosphere.
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