کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9620404 | 159409 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia](/preview/png/9620404.png)
چکیده انگلیسی
Paper birch (Betula papyrifera Marsh.) is routinely chemically or mechanically weeded from Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) plantations to increase conifer productivity, but these practices are controversial because of unknown effects on forest health and diversity. This study examined effects of paper birch density reduction treatments on productivity and disease incidence of Douglas-fir saplings in the southern interior of British Columbia. Five paper birch density treatments (0, 400, 1111, 4444 stems haâ1 and an un-thinned control of >7000 stems haâ1), where paper birch was manually cut at the root collar in 1999, were replicated on four sites in a randomized block design. After 2 years, Douglas-fir survival did not differ significantly among treatments, but where Armillaria ostoyae (Romagn.) Herink was present in untreated stands, mortality due to root disease increased significantly with increasing paper birch thinning intensity. Mean diameter increment and height:diameter ratio of Douglas-fir improved where paper birch was completely removed or partially thinned compared with the control. Mean light transmittance and soil moisture content increased with decreasing paper birch density, but Douglas-fir foliar N status was unaffected. Our results suggest that Douglas-fir growth can be improved and root disease incidence minimized by thinning paper birch to 4444 stems haâ1 in young mixed stands, but that subsequent release treatments may be necessary to maintain Douglas-fir growth rates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 208, Issues 1â3, 5 April 2005, Pages 1-13
Journal: Forest Ecology and Management - Volume 208, Issues 1â3, 5 April 2005, Pages 1-13
نویسندگان
Karen E. Baleshta, Suzanne W. Simard, Robert D. Guy, Christopher P. Chanway,