Treatment Duration and Time since Disturbance Affect Vegetation Development in a211 Young Ponderosa Pine Plantation

摘要

The effect of early and delayed release treatments (designated as 'Treat first 3211u001eyears' and 'Treat second 3 years', respectively) on diameter, height, density, 211u001eand foliar cover of ponderosa pine seedlings was evaluated and compared with the 211u001ecompeting vegetation in a young northern California plantation. The survival of 211u001ethe ponderosa pines over all treatments after 1 growing season was 99 percent and 211u001eafter 10 seasons was 96 percent. Both release treatments resulted in greater 211u001econifer diameter, height, and foliar cover than in the control at the end of the 211u001estudy. Conifer values between the two release treatments did not differ 211u001esignificantly at the end of the study.