INVESTIGADORES
PANCOTTO Veronica Andrea
artículos
Título:
Tiller population dynamics and production on Spartina densiflora (Brong) on the floodplain of the Paraná River, Argentina
Autor/es:
VICARI, R.; FISHER, S.; MADANES, N.; BONAVENTURA, S. M.; VERONICA ANDREA PANCOTTO
Revista:
WETLANDS
Editorial:
SPRINGER
Referencias:
Año: 2002 vol. 22 p. 347 - 354
ISSN:
0277-5212
Resumen:
Tiller dynamics and net aerial primary productivity (NAPP) were studied in permanent sample
plots of Spartina densiflora at Otamendi Natural Reserve (Buenos Aires Province, Argentina) from June
1996 to December 1997. Emergence, growth, senescence, survival, biomass dynamics, and tiller productivity
were analyzed. These population attributes varied seasonally during the first study year, whereas variations
were not detected in the subsequent year. Tiller density increased slightly during the first twelve months,
attaining 2445 6 869 tillers·m22, then remaining constant until the end of the study period. Senescence rate
was lower than emergence rate on most sampling occasions. Cohorts originated in different seasons showed
distinct survival curves. The life span of tillers was at least 18 months. Green biomass reached maximum
values (771 6 410 g·m22) during the first year but decreased during the last six months of observations.
Annual NAPP was 1450 6 566 g·m22·y21. Average productivity rate was higher in the first year than in the
second year. The decrease in the population density of tillers of S. densiflora and the increase in its senescence
rate were more likely related to grazing and flooding than to population dynamics.