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- W2090583087 abstract "We compared readings from a Robel pole, a visual obstruction (VO) device for measuring vegetation structure, to standing crop estimates made with the harvested biomass (HB) technique in warm-season grass stands of various composition. The grass stands were single-species seedings rotationally grazed by bison. Re-colonization of cool-season forages that had previously dominated the site significantly reduced warm-season grass abundance at the time of the study. Visual obstruction readings provided good predictions of standing crop as estimated by HB from 0.1-m2 quadrats, but predictions were better (r2 = 0.76) when measurements were aggregated to the transect level, a spatial scale representative of a typical grazing paddock. The relationship between VO and HB compared at the individual sample level or when aggregated within experimental species plots was very weak (r2 = 0.14 and 0.17, respectively). Our results, and a review of the literature, indicate that the Robel pole should perform well when used in relatively uniform vegetation, but the scale where vegetation is uniform is likely to be larger than the individual sampling units." @default.
- W2090583087 created "2016-06-24" @default.
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- W2090583087 date "2006-01-01" @default.
- W2090583087 modified "2023-10-16" @default.
- W2090583087 title "Revisiting Robel's Visual Obstruction Method for Estimation of Standing Crop in Grasslands" @default.
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- W2090583087 doi "https://doi.org/10.1094/fg-2006-1213-01-rs" @default.
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