RESPUESTA DE CINCO ESPECIES DE Pinus A DIVERSOS NIVELES DE COMPETENCIA, EN EXPOSICIONES CONTRASTANTES DE ÓREGON Y COAHUILA
Keywords:
Ecology, Fisiology, Silviculture, forest planting, Coahuila, OregonAbstract
The effect offorest shrub vegetation on soil moisture, temperature, evaporation potential, survival, growth and bud activity offive species of Pinus, was studied on planting sites placed on opposite exposures on two locations in southwest Oregon, U S A and Coahuila in northeast Mexico.
Treatments applied were:
- Manual slashing.- Manual slashing.- Manual slashing plus preemergent herbicide.- Dead shade provided by spraying the brush with herbicides and leaving it standing dead.- Dummie (no treatment).
The location factor provided differences in season ofmoisture availability and temperature extremes in which maximum growing-season water, and heat stress. were observed in Oregon.
Clearing led to different shifts in competitor type, to herbs in Oregon and to resprouting shrubs in Coahuila.
The differences among treatments showed a similarity in tendencies in both locations; aspect affected the degree of differences.
Eliminating ali or part of the competing vegetation conserved soil moisture effectively, increased the radiation load on the ground, reduced the trasnspirational less of soil moisture and increased the evaporation demand of the air.
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