Effect of certain fungicides in controlling damping-off in seedlings of ponderosa pine, Douglas-fir, and Colorado blue spruce
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PURCHASED BY USDA FOREST SERVICE FOR OFFICIAL USE Seedling Responses of Five Species of Western Conifers to Simulated Ambient Sulfur Dioxide Exposures
Seedlings of ponderosa pine, Douglas-fir, white fir, Engelmann spruce, and subalpine fir were exposed continuously to charcoal-filtered (CF) air or one of three levels of a simulated ambient exposure typical of SO, pollution near smelters in the western United States. Seedlings were exposed during winter-spring experiments for 60 days to hourly means of 17, 38, and 54 ppb in 1988 and 35, 57, an...
متن کاملPonderosa Pine, Mixed Conifer, and Spruce-fir Forests
Before European settlement of the interior west of the United States, coniferous forests of this region were influenced by many disturbance regimes, primarily fires, insects, diseases, and herbivory, which maintained a diversity of successional stages and vegetative types across landscapes. Activities after settlement, such as fire suppression, grazing, and logging significantly altered these d...
متن کاملDefoliation of interior Douglas-fir elicits carbon transfer and stress signalling to ponderosa pine neighbors through ectomycorrhizal networks
Extensive regions of interior Douglas-fir (Pseudotsuga menziesii var. glauca, IDF) forests in North America are being damaged by drought and western spruce budworm (Choristoneura occidentalis). This damage is resulting from warmer and drier summers associated with climate change. To test whether defoliated IDF can directly transfer resources to ponderosa pine (Pinus ponderosae) regenerating nea...
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Fertilization at planting with GromaxTM teabags did not affect survival of Douglas-fir, Engelmann spruce or lodgepole pine seedlings. Fertilized seedlings were taller and had larger stem diameters in the second year after planting, but this effect had disappeared by year five. In year nine, the proportion of seedlings that had reached free growing was similar in fertilized and unfertilized trea...
متن کاملFall Acclimation and the Lift/Store Pathway: Effect on Reforestation
This review compares fall acclimation patterns and lift/store practices for Pseudotsuga menziesii var. menziesii, Picea glauca (Moench) Voss x P. engelmannii Parry ex engelm and Pinus taeda L. seedlings. Spruce seedlings achieve budset and an endodormant state in late summer, coastal Douglas-fir in early fall, while loblolly pine achieves a less endodormant state with a limited amount of mitoti...
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