منابع مشابه
In Pine 29 Forest Products Journal
machinability. Abstract Flakes 3 Inches along the grain. 3/8-inch wide, and 0.02 inch thick were machined from the taproots (with 6inch-high stump) and second logs at eight 31-year-old slash pines. Specific gravity (O.D. weight, green volume) of Items averaged 0.52; rootwood averaged 0.43 and decreased sharply with depth below ground. Forty-four-lb./cu. ft. structural-type particleboards were p...
متن کاملThe Southern Pine Beetle and Pine Forest Ecosystems
Dendroctonus frontalis, the southern pine beetle (SPB), is a highly destructive species of bark beetle that inhabits pine forests in the southern United States and parts of Central America. @6D In natural pine forests, the ecological role of the SPB presumably is to hasten the demise of weak or damaged trees, perhaps creating kindling for fires that contribute positively to the long-term health...
متن کاملNature of radioactive contamination in soils of the pine forest in the territory adjacent to Semipalatinsk test site
ABSTRACT Background: This work investigated radioactive contamination in soils of the pine forest in the territory adjacent to Semipalatinsk test site. Materials and Methods: Thirty samples from the soil were collected from six different a soil profile was laid out (research areas). Activity concentrations of 137Cs and 241Am were determined using a Canberra GX-2020 solid-state gamma-spectromet...
متن کاملPine wilt disease – a threat to pine forest in Europe
Pine wilt disease caused by pine wood nematodes is endemic to North America. Pine wood nematodes have already spread to East Asia, including China, Taiwan and Korea in addition to Japan. The pine wood nematode, Bursaphelenchus xylophilus, was discovered in Portuguese pine forests in 1999. If it were to become established in the pine forests in Europe, it could become one of the most serious thr...
متن کاملDrying Characteristics of Pine Forest Residues
The thin layer drying of pine forest residues consisting of bark, needles, leaves, and chips was experimentally conducted at air temperatures of 40, 50, 60, 70, and 80C. Physical and chemical properties of fractionated forest residues were determined to evaluate its fuel properties. The experimental data obtained from thin layer drying study were fitted with Lewis, Page, and Henderson and Pabis...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1870
ISSN: 0036-8733
DOI: 10.1038/scientificamerican03191870-186