المستودع الأكاديمي جامعة المدينة

Comparative effects of precommercial thinning, urea fertilizer, and red alder in a site 11, coast Douglas-fir plantation

أعرض تسجيلة المادة بشكل مبسط

dc.date 2007-06-05T14:39:28Z
dc.date 2007-06-05T14:39:28Z
dc.date 1999-11
dc.date.accessioned 2013-10-16T07:50:51Z
dc.date.available 2013-10-16T07:50:51Z
dc.date.issued 2013-10-16
dc.identifier http://hdl.handle.net/1957/5117
dc.identifier.uri http://koha.mediu.edu.my:8181/xmlui/handle/1957/5117
dc.description The authors varied the number of red alder retained with 300 Douglas-fir per acre on a high-quality site in coastal Oregon. Alder densities of 0, 20, 40, and 80 per acre were tested. The authors' fifth treatment eliminated nitrogen-fixing alder, but substantial nitrogen fertilizer. Treatment 6 had neither thinning nor alder control. Treatments were randomly assigned within each of three blocks in a 9-year-old plantation. Stand density was reduced within 15 of these 18 experimental units. Surplus conifers were cut, but surplus red alder were controlled by the 'hack-and-squirt' method. Because numerous trees of other species regenerated naturally, combined density of all species before thinning ranged from 1,400 to 5,700 trees per acre. Subsequent 17-year change in number, average height, basal area, and volume of Douglas-fir were compared. Retaining 20, 40, or 80 alder per acre reduced numbers of associated Douglas-fir by about 10, 17, and 23 percent, respectively. In pur Douglas-fir plots, gross volume growth was similar for nonfertilized and fertilized plots, indicating no measureable benefits of additional nitrogen. in mixed stands, red alder reduced yield of associated Douglas-fir, but not yield of combined species. Similar comparisons are needed at other locations, especially those with known nitrogen deficiency.
dc.language en_US
dc.publisher Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
dc.relation Research paper PNW
dc.relation 513
dc.relation Reports and Publications -- Other Reports and Publications
dc.relation Explorer Site -- Oregon Explorer
dc.relation Explorer Site -- Land Use Explorer
dc.subject Thematic Classification -- Habitats and Vegetation -- Vegetation -- Forests
dc.subject Thematic Classification -- Geography and Geology -- Soils
dc.subject Thematic Classification -- Plants and Animals -- Plants
dc.title Comparative effects of precommercial thinning, urea fertilizer, and red alder in a site 11, coast Douglas-fir plantation
dc.type Technical Report


الملفات في هذه المادة

الملفات الحجم الصيغة عرض

لا توجد أي ملفات مرتبطة بهذه المادة.

هذه المادة تبدو في المجموعات التالية:

أعرض تسجيلة المادة بشكل مبسط