Data/hora: 16/06/2024 02:25:29

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 09/01/1998
Data da última atualização: | 05/04/2017
Autoria: | OJIMA, D. S.; SCHIMEL, D. S.; PARTON, W. J.; OWENSBY, C. E.
Título: | Long- and short-term effects of fire on nitrogen cycling in tallgrass prairie.
Ano de publicação: | 1994
Fonte/Imprenta: | Biogeochemistry, v.24, p.67-84, 1994.
Idioma: | Inglês
Conteúdo: | Fires  in the tallgrass prairie are frequent and signicantly alter nutrtient cycling processes. We evaluated the short-term changes in plant production and microbial activity due to fire and the long-term consequences of annual burning on soil organic matter (SOM), plant production, and nutrient cycling using a combination of field, laboratory, and modeling studies. In the short-term, fire in the tallgrass prairie enhance microbial activity, increases both above and belowground plant production, and increases nitrogen use efficiency (NUE). However, repeated annual burning results in greater inputs of lower quality plant residues causing a significant reduction in soil organic N, lower microbial biomass, lower N availability, and higher C:N ratios in SOM. Changes in amount and quality of belowground inputs increased N immobilization and resulted in no net increases in N availability with burning. This response occurred rapidly (e.g., within two years) and persisted during 50 years of annual burning. Plant production at a long-term burned site was not adversely affected due to shifts in plant NUE and carbon alloction. Modeling results indicate that the tallgrass ecosystem responds to the combined changes in plant resource allocation and NUE. No single factor dominates the impact of fire on tallgrass plant production.
Palavras-Chave: | Eficiencia no uso de nitrogenio; Fire; Grassland; Nitrogen use efficiency; Tallgrass prairie.
Thesagro: | Carbono; Fogo; Matéria Orgânica; Pastagem; Solo.
Thesaurus Nal: | carbon; soil organic matter.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (35178-1) - ADC - SP - PP - SP15475 -  - 15475 - DIS