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The importance of understory measurement in forest and range research
Harvesting and weighing vegetation William D Boyernnnnnnnnnnnn
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3-Step Method acorns acre analysis average basal area belt transect bunchgrasses canopy clipping and weighing coefficient coefficient of variation composition computed condition classes crown cover Curtis density determined developed diameter distribution double-sampling Ecol ecology EDPM efficient factors forage forage utilization forest floor Forestry frequency grams grasses grassland grazing ground growth herbage production herbage weight inches increase intercept interception method Jour l-chain 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 plant communities ponderosa pine population precision problem procedure quadrat range condition range survey regression sample plots sampling error sampling units seed seedlings shrubs simple random sample species-area curve stand statistical systematic sampling techniques tests total herbage transect traps trees U. S. Forest Serv understory vegetation variable variance variation weight estimates yield