Effects of seasonal rest in aboveground biomass for a native grassland of the flood Pampa, Argentina

摘要: Changes in total biomass and botanical composition a native pasture of the Flooding Pampa Salado River Basin (Province Buenos Aires), under 3 grazing systems: spring-summer rest (November, December, January); fall April, May, June), continuous were evaluated from October 1979 to August 1981. A variable stocking rate based on available forage was used. Total aboveground periodically sampled ground level separated into dead green components. The subdivided individual species. averaged 4,600 +/- 445 kg . ha-1 3,750 120 for treatment during first second years, respectively. In same period, warm-season species increased, principally due an increase dallisgrass (Paspalum dilatatum Poir.) bluestem (Bothriochloa laguroides Herter) biomass. yield 2,000 170 treatment, cool-season such as Poa spp. Stipa increased. general, at moderate intensity resulted about DM throughout experimental period. Contributions did not change. Only West Indies smutgrass (Sporobolus indicus (L.) R. Br.) increased grazing.