Data/hora: 22/06/2024 06:45:47

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 05/07/1996
Data da última atualização: | 05/09/1996
Autoria: | SCIFRES, C. J.; MUTZ, J. L.; WHITSON, R. E.; DRAWE, D. L.
Título: | Mixed - brush canopy cover - rainfall interrelationships with native grass production.
Ano de publicação: | 1983
Fonte/Imprenta: | Weed Science, v.31, n.1, p.1-4, Jan. 1983.
Idioma: | Inglês
Conteúdo: | Annual production of native grasses on the Texas Coastal Prairie was decreased by 90, 66, and 67 kg/ha in 1978, 1979, and 1981, respectively, for each 1% increase in mixed- brush canopy cover in the range, from 12 to 57%. Differences in regression coefficients among years were not significant (P<0.05), although rainfall varied from 84% of the 26 - yr average (91.5 cm) in 1978 to 150% of the annual average in 1981. Grass production during the growing season (May through October) only was decreased by 58, 113, and 78 kg/ha in 1978, 1979, and 1981, respectively, for each unit percentage increase in brush canopy cover. A greater proportion of the annual rainfall occurred during the growing season of 1979 than during the drier spring and summer of 1978. Native grasses typical of brush - free Coastal Prairie occupy the interstitial areas among the mixed - brush mottes, but bunch cutgrass (Leersia monandra Swartz) is the only grass that perists from the canopy edge to 1.5 m inward from the brush driplines. Litter or no herbaceous vegetation grows in the centers of the mottes.
Palavras-Chave: | Coastal Prairie; Competicao; Competition; Native grass production; Range ecology.
Thesagro: | Ecologia; Pastagem Nativa; Produção.
Thesaurus Nal: | range improvement.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)

Exemplares:

CPAP - (32661-1) - ADD - SP - -- - SP3029 -  - 3029 - DIS
CPAP - (32965-1) - ADC - SP - -- - SP3208 -  - 3208 - DIS