Graduate Thesis Or Dissertation
 

Early survival and growth response of five species of Pinus to plant competition and aspect in southwest Oregon and northeast Mexico

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f7623f95k

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  • The effect of forest shrub vegetation on soil moisture, temperatures evaporation potentials and the survivals growth and bud activity of five species of Pinus was studied on planting sites placed on opposite exposures on two locations in southwest Oregon and northeast Mexico. Treatments applied were: Manual slashing; Manual slashing plus Simazine; Dead shade providsd by spraying the brush with herbicides and leaving it standing dead; and Control (no treatment). The location factor provided differences in season of moisture availability and temperature extremes in which maximum growing-season water and heat stress were observed in Oregon. Clearing led to different shifts in competitor types to herbs in Oregon and to resprouting shrubs in Mexico. The differences among treatments showed a similarity in tendencies in both locations; aspect affected the degree of differences. Eliminating all or part of the competing vegetation conserved soil moisture effectively increased the radiation load on the ground. reduced the transpirational loss of soil moisture and increased the evaporation demand of the air. The lack of treatment kept the radiation load to minimum reducing the potential evaporation and temperatures but the live cover strongly reduced the soil moisture availability and reduced photosynthetically active light. Lethality was greatest where aspect and location effects also led to minimum soil moisture. Clearing in general increased tree growth and increased growth most with further reductions in root competition. On south slopes the treatments in the cleared area increased the likelihood of heat damage during the dry season for seedlings located on rocky spots. Dead shade ameliorated the temperature-related stress and competition reduction ameliorated the soil-water related stress. Differences among species reflect differences in strategies adapted to native environments. Ecological and physiological parameters indicate that complete vegetation control in Oregon and complete woody plant control in Nexico are essential to successful introduction of pine species into brush-covered commercial forest land.
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