Publicação
Efeito da cinza de biomassa na dinâmica do C e N do solo de uma plantação de Pinus pinaster
| Resumo: | Effects of wood ash (loose and pelleted) on chemical properties and microbial activity in an Arenosol from a Pinus pinaster plantation were assessed through laboratory incubation. Wood ash was applied at a rate of 0, 4 and 8 g kg-1 soil both alone or together with N. Loose ash significantly increased pH values and extractable nutrients from the soil. Net nitrification was stimulated by it application. Amounts of microbial biomass C were lower in soils with loose ash than in the control. Basal respiration was not affected by treatments. Effects increased with the increment of applied ash and when applied together with N. Application of pelleted ash produced smaller changes in soil chemical characteristics, net nitrification and C dynamic. Results suggest that, in N limited soils, wood ash should be applied in the pelleted form because changes in chemical soil properties are slower and the potential loss of N is much less as compared to the loose ash. Pelleted ash should be applied together with N fertilizer to improve soil N availability. |
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| Autores principais: | Gómez-Rey, Maria Xesus |
| Outros Autores: | Madeira, Manuel; Coutinho, João; Vasconcelos, Ernesto |
| Assunto: | basal respiration microbial biomass N mineralization loose ash pelleted ash |
| Ano: | 2010 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | português |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Effects of wood ash (loose and pelleted) on chemical properties and microbial activity in an Arenosol from a Pinus pinaster plantation were assessed through laboratory incubation. Wood ash was applied at a rate of 0, 4 and 8 g kg-1 soil both alone or together with N. Loose ash significantly increased pH values and extractable nutrients from the soil. Net nitrification was stimulated by it application. Amounts of microbial biomass C were lower in soils with loose ash than in the control. Basal respiration was not affected by treatments. Effects increased with the increment of applied ash and when applied together with N. Application of pelleted ash produced smaller changes in soil chemical characteristics, net nitrification and C dynamic. Results suggest that, in N limited soils, wood ash should be applied in the pelleted form because changes in chemical soil properties are slower and the potential loss of N is much less as compared to the loose ash. Pelleted ash should be applied together with N fertilizer to improve soil N availability. |
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