Herbage Production following Tree and Shrub Removal in the Pinyon-Juniper Type of Arizona

Abstract
Herbage production was evaluated after overstory removal from different sites within the pinyon-juniper type. Average annual production ranged from 43 to 643 kg/ha before treatment and 715 to 3703 kg/ha after treatment. Production variation among sites was related to annual precipitation, pretreatment tree canopy, pretreatment nitrate-N and presence or absence of limestone soils. Grasses increased in the composition from 46 to 73% on the average, while forbs decreased from 21 to 19% and half-shrubs and shrubs decreased from 33 to 8%.

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