https://www.arborday.org/trees/treeGuide/TreeDetail.cfm?ItemID=901 "Trunk diameter is about as good as it gets for estimating root spread of unobstructed trees. A comparison of the capacities of granitic and andesitic soils, with and without nutritional augmentation, to promote above- and below-ground development of ponderosa pine (Pinus ponderosa Dougl. Fire Ponderosa pines thrive in sunlight and require periodic fires. Most roots grow within the top foot (30 cm) of the surface. J. Worrall: Root system: P. ponderosa has a hefty taproot, which contributes to the cylindrical form of the bole. They are stiff, sharp tipped, and the fascicle persists (stays on tree) after the needle falls, contributing to the rough texture of the twigs. It was also valued for its beneficial effect upon the respiratory system and was used to treat various chest and lung complaints. Ponderosa pine is a species of lean and erect coniferous trees distributed in the western US and Canada. Ponderosa pine taproots can go down 30 feet to reach deep moisture. The root system can spread 100 feet from the trunk. ex Laws.) The bark of mature ponderosa pine has deep grooves and small 'jigsaw puzzle' patterns on the ridges. the surface. Once on the ground, microorganisms work rapidly (aided by greater moisture levels near the ground surface) and accelerate the decomposition process (Figure 7). when the root system has deteriorated sufficiently that it can no longer support the snag in an upright position (Figure 6). seedlings was conducted. Ponderosa pine was employed medicinally by several native North American Indian tribes, who valued it especially for its antiseptic and vulnerary properties, using it to treat a range of skin problems, cuts, wounds, burns etc. Needles are in bundles of 2 to 3, are dark yellowish-green, 5 to 10 inches long and form in tufts near branch ends. Walker RF, Susfalk RB and Johnson DW. Root systems consist of a deep tap root as well as deep laterals 20 inches below. The cones leave some scales on the twig when they fall off, as can be seen in the top-right corner of the photograph. Abstract Root System Development of Juvenile Ponderosa Pine as Influenced by Soil Type and Nutritional Augmentation. Pine trees are not known for having invasive root systems but if the soil is dry roots will go where the water is. It is one of the most abundant conifer species in America and is valued for its rugged-looking and resilient timber as well as for recreational use. Scientific Classification Kingdom Plantae Division Pinophyta Class Pinopsida Order Pinales Family […] Historically, low-intensity fires caused by lightning or set by Indians burned every few decades and killed competing species that shaded out young ponderosa pines. J. Worrall : Cones: First-season cones on P. ponderosa.

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