Los escenarios de cambio climático global son una realidad que repercutirá negativamente en la integridad de los ecosistemas de pastizales. El estudio se realizó en pajonal húmedo de condición regular de la SAIS Túpac Amaru, ubicada en Junín a 4186 msnm. El objetivo de la presente investigación fue optimizar los cambios en patrones de precipitaciones pluviales e intensidades de utilización sobre altura, vigor y productividad de Festuca humilior. Se realizó sobre la base de los pesos y volúmenes que se elaboraron ecuaciones alométricas, análisis de regresión lineal y la metodología de superficies de respuesta. Para mejor ajuste se consideraron mayores coeficientes de determinación (R2), aporte significativo y bajos errores estándar de los términos. Festuca humilior mostró reducciones significativas en altura, vigor y productividad a intensidades altas y moderadas de uti...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ciencia Animal

The models of growth and allometry of grasslands allow to know growth and development phenomena. Consequently, the aim of this study was to develop a multi-species allometric model to estimate biomass in three grasses in the High Andean Zone of Jauja, Peru, at an altitude of 3600 m above sea level. The native grasses were Festuca dolichophylla (J. Presl) tall (50-90 cm), Festuca humilior (Nees & Meyen) medium (20-35 cm) and Calamagrostis vicugnarum (Weddell) Pilger short (5- 25 cm). The measured variables were biomass (g, YB), basal diameter (cm, XD), canopy diameter (cm, XC) and height (cm, XH). The potential regression was used by choosing the strength of the models by the Akaike criterion (IAC) and the adjusted coefficient of determination (adjusted R2). The multispecies allometric model was Y = 1,238 * XD2,231, due to its lower IAC (383.795) and higher adjusted R2 (85.4%). C. vic...

The models of growth and allometry of grasslands allow to know growth and development phenomena. Consequently, the aim of this study was to develop a multi-species allometric model to estimate biomass in three grasses in the High Andean Zone of Jauja, Peru, at an altitude of 3600 m above sea level. The native grasses were Festuca dolichophylla (J. Presl) tall (50-90 cm), Festuca humilior (Nees & Meyen) medium (20-35 cm) and Calamagrostis vicugnarum (Weddell) Pilger short (5- 25 cm). The measured variables were biomass (g, YB), basal diameter (cm, XD), canopy diameter (cm, XC) and height (cm, XH). The potential regression was used by choosing the strength of the models by the Akaike criterion (IAC) and the adjusted coefficient of determination (adjusted R2). The multispecies allometric model was Y = 1,238 * XD2,231, due to its lower IAC (383.795) and higher adjusted R2 (85.4%). C. vic...