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• W2100399835 abstract "Multispecies allometric models to predict grass biomass may increase field study efficiency by eliminating the need for species-specific data. We used field measurements during two growing seasons to develop single-species and multispecies regression models predicting the current year’s aboveground biomass for eight common cespitose grass species. Simple and stepwise regression analyses were based on natural log expressions of biomass, basal diameter, and height, and a dummy variable expression of grazing history. Basal diameter had the strongest relationship with biomass among single-species (adjusted R2 = 0.80 to 0.91) and multispecies (adjusted R2 = 0.85) models. Regression slopes (b) for diameter among single-species (b = 1.01 to 1.49) and the multispecies (b = 1.25) models suggests that biomass will double when diameter increases ~ 75%. Height and grazing history added little predictive value when diameter was already in the model. When applied to actual populations, biomass estimates from multispecies models were within 3-29% of estimates from the single-species models. Although the multispecies biomass-size relationship was robust across the cespitose life-form, users should be cautious about applying our equations to different locations, plant sizes, and population size-structures. Los modelos alométricos de especies múltiples para predecir biomasa en gramíneas pueden incrementar la eficiencia del studio en campo, eliminando la necesidad de datos propios de cada especie. Se utilizaron medidas en el terreno durante dos estaciones de crecimiento para desarrollar modelos de regresión simple y de especies múltiples para predecir la biomasa aérea del presente año en ocho especies de gramíneas cespitosas. Los análisis de regresión simple y regresión gradual se basaron en expresiones logarítmicas naturales de la biomasa, diámetro basal y altura; y una expresión simulada del pastoreo histórico. El diámetro basal mostró la relación más alta con biomasa entre los modelos simple (R2 ajustada = 0.80 -0.91) y de especies múltiples (R2 ajustada = 0.85). La pendiente de la regresión (b) para el diámetro entre los modelos simple (b = 1.01-1.49) y de species múltiples (b = 1.25) sugieren que la biomasa será el doble cuando el diámetro se incremente aproximadamente 75%. La altura de la planta y la historia del pastoreo no fueron determinantes cuando el diámetro se incluyó en el modelo. Cuando se aplicaron a poblaciones reales, las estimaciones de biomasa de modelos de especies múltiples estuvieron dentro de un 3 y 29% de las estimaciones de los modelos simples. Aunque la relación biomasa-tamaño del modelo de especies múltiples fue alta entre la forma cespitosa, se debe ser cauteloso en la aplicación de estas ecuaciones en las diferentes localidades, tamaños de planta y tamaño de la estructura de la población." @default.
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• W2100399835 date "2009-01-01" @default.
• W2100399835 modified "2023-09-27" @default.
• W2100399835 title "Multispecies Allometric Models Predict Grass Biomass in Semidesert Rangeland" @default.
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• W2100399835 doi "https://doi.org/10.2111/08-003" @default.
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