Pine Hollow Exclosures: Effect of Browsing on an Aspen Community Sprayed with 2,4-D

摘要

The Pine Hollow aspen (Populus tremuloides) exclosures on the Ashley NationalForest in eastern Utah were sampled in 1984, 19 years after they were established. The effects of 2,4-D, wildlife, and cattle on plant succession were evaluated. Two exclosures were used to protect the sprayed area from (1) all animal use and (2) only livestock use. A third sprayed area was left open for use by all animals. The aspen overstory was killed as a result of spraying, with sufficient reproduction occurring to restock the stand. However, animal use drastically altered the aspen reproduction, as well as the understory production.