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Effects of Seasonal Rest in Aboveground Biomass for a Native Grassland of the Flood Pampa, Argentina

L. G. Hidalgo and M. A. Cauhépé
Journal of Range Management
Vol. 44, No. 5 (Sep., 1991), pp. 471-475
DOI: 10.2307/4002747
Stable URL: http://www.jstor.org/stable/4002747
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Seasonal Rest in Aboveground Biomass for a Native Grassland of the Flood Pampa, Argentina
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Abstract

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

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