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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Impacts of timber harvest intensity and P fertilizer application on soil P fractions

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Autor(es):
Rocha, Jose Henrique T. [1, 2] ; Menegale, Marcella L. C. [3] ; Rodrigues, Marcos [4] ; Goncalves, Jose Leonardo de M. [2] ; Pavinato, Paulo S. [4] ; Foltran, Estela Couvre [2] ; Harrison, Robert [3] ; James, Jason N. [3]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] FAEF, Agr & Forest Engn Coll, Garca, SP - Brazil
[2] Univ Sao Paulo, Dept Forest Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil
[3] Univ Washington, Sch Environm & Forest Sci, Seattle, WA 98195 - USA
[4] Univ Sao Paulo, Dept Soil Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: FOREST ECOLOGY AND MANAGEMENT; v. 437, p. 295-303, APR 1 2019.
Citações Web of Science: 2
Resumo

Research has shown significant effects of timber harvest residue management on soil organic carbon (SOC), but less impact has been observed on the available P pool. The objectives of this study were: (1) to estimate the effects of different timber harvest intensities and P fertilization on soil labile P and P fate over time; and (2) to identify which soil P fractions supply P to Eucalyptus plantations cultivated in soils with low P availability. P fractions were assessed using Hedley's sequential extraction methodology, which corresponds to differing degrees of soil P lability. Three timber harvest intensities (stemwood only, whole tree and whole tree plus litter) and two levels of P fertilization (0 and 44 kg ha(-1) of P) were used. A total of 70% of total soil P was found in a non-labile form in the whole tree plus litter removal treatment, while in the whole tree treatment only 66% was found in this form. Removal of harvesting and litter residues resulted in a 40% reduction in the labile P fraction when compared to stemwood only harvested treatment even with fertilizer application. Acid phosphatase activity, which is crucial in mobilizing P for plant uptake, was 45% higher in soils that did not receive P fertilizer, but it did not resulted in higher concentration of labile P. Timber harvest intensity and P fertilizer application did not influence the soil total P concentration over 12 years of Eucalyptus cultivation. However, there was an increase in non-labile and inorganic P fractions and a reduction of labile and organic P fractions with increasing timber harvest intensity. The organic, moderately labile P fraction was the main source of P to the trees under low P availability conditions. Acid phosphatase and low molecular weight organic acid excretion seem to be important strategies of Eucalyptus species to improve P uptake. (AU)

Processo FAPESP: 18/08338-4 - IUFRO Eucalyptus 2018 - Managing Eucalypt Plantations under Global Changes
Beneficiário:José Henrique Tertulino Rocha
Linha de fomento: Auxílio à Pesquisa - Reunião - Exterior
Processo FAPESP: 14/15876-1 - Manejo de resíduos florestais e deficiência nutricional em duas rotações de cultivo de eucalipto
Beneficiário:José Henrique Tertulino Rocha
Linha de fomento: Bolsas no Brasil - Doutorado