Data/hora: 25/06/2024 07:02:16

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 15/02/1995
Data da última atualização: | 06/04/2017
Autoria: | KLOPATEK, J. M.
Título: | Nitrogen mineralization and nitrification in minerals soils of pinyon-juniper ecosystems.
Ano de publicação: | 1987
Fonte/Imprenta: | Soil Science Society America Journal, v.51, p.453-457, 1987.
Idioma: | Inglês
Conteúdo: | The mineral soils in the interspaces and under canopy of three punyon (Pinus edulis Engelm)-juniper [Juniperus osteosperma (Torr.) Little] woodland communities were analyzed to determine their nutrients status and potential N mineralization and nitrification. A>400-yr-old ungrazed, a 300-yr-old grazed, and a 35-yr-old burned and grazed site were represented. Significant differences were noted in soil pH, texture, bulk density, total N, organic C, and NaHCO3 extractable P between the canopies and the respective interspaces of the mature sites. No differences were noted between the canopy soils of the ungrazed and grazed mature sites. The 35-yr-old canopy soils showed significantly less total N organic C than the mature sites. Interspaces exhibited relatively few differences between sites. Both canopy and interspace soils exhibited linear rates of mineralization and nitrification over the 60-d incubation. On all sampling dates there were significant differences in mineralization and nitrification rates between the canopy and interspaces soils. The proportion of total N mineralization was highest for the most disturbed (burned grazed) canopy soils and lowest for the least disturbed (ungrazed). The results obtained indicate that nitrification is not inhibited in mature pinyon-juniper woodlands, but suggest that the rate of N mineralization and nitrification may be enhanced by disturbance.
Thesagro: | Mineralização; Nitrificação; Solo.
Thesaurus Nal: | Juniperus osteosperma; mineralization; nitrification; Pinus edulis; soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (27721-1) - ADD - SP - PP - SP14095 -  - 14095 - DIS