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Harvesting and weighing vegetation William D Boyer
The weightestimate method in herbage production determinations
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3-Step Method acorns acre Amphicarpum average basal area belt transect bunchgrass canopy clipping and weighing coefficient of variation composition computed condition classes crown cover density determined developed diameter distribution double-sampling Ecol ecology EDPM efficient factors forage forest floor Forestry frequency grams grasses grassland grazing green weight ground growth H-layer herbage production herbage weight inches increase intercept interception method Jour line transect line-intercept litter loblolly pine loop method Mangt methods of measuring mull normal distribution number of samples observations obtained organic matter oven-dry overstory pantograph pasture Pechanec percent photographs Pickford pine plant communities ponderosa pine population precision problem procedure quadrat randomly range condition range survey regression sample plots sampling error sampling units seed seedlings shrubs simple random sample species-area curve stand standard error statistical systematic sampling techniques tests total herbage traps trees U. S. Forest Serv understory vegetation variable variance weight estimates yield