Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia
Manual brushing is used to minimize the competitive effects of paper birch (Betula papyrifera Marsh) and associated broadleaved trees on young Douglas-fir (Pseudotsuga menziesii var. glauca) in southern interior British Columbia. Effects of brushing broadleaved trees, predominantly birch, on interio...
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| Language: | English |
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Canadian Institute of Forestry
2020-07-01
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| Series: | The Forestry Chronicle |
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| Online Access: | https://pubs.cif-ifc.org/doi/10.5558/tfc2020-020 |
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| author | George Harper Kevin Brown |
| author_facet | George Harper Kevin Brown |
| author_sort | George Harper |
| collection | DOAJ |
| description | Manual brushing is used to minimize the competitive effects of paper birch (Betula papyrifera Marsh) and associated broadleaved trees on young Douglas-fir (Pseudotsuga menziesii var. glauca) in southern interior British Columbia. Effects of brushing broadleaved trees, predominantly birch, on interior Douglas-fir survival and growth were studied on four sites. Treatments were applied when plantations were five to nine years old. Through 10 years post treatment, brushing did not affect Douglas-fir survival, but increase height by 22 % and stem diameter by 31 % and the differences were greater than seen at five years. After 10 years, linear models described a declining Douglas-fir height or diameter with increasing broadleaved tree density. Boundary line analysis was used to describe maximum treatment response to broadleaved density and two distance independent competition indices for birch and broadleaves, combining either cover or density with relative heights (CRH, DRH, respectively). A negative exponential relationship was fit to 10-year Douglas-fir heights and diameters with increasing values CRH or DRH. Competition thresholds for density, CRH and DRH were not apparent. The quantile regression results indicated the 10-year response of young Douglas-fir diameter to brushing occurred primarily with the largest 55 % to 85 % of the population, CRH and DRH respectively. |
| format | Article |
| id | doaj-art-e668274241cc40669be7f77a4c2d2d7f |
| institution | Kabale University |
| issn | 0015-7546 1499-9315 |
| language | English |
| publishDate | 2020-07-01 |
| publisher | Canadian Institute of Forestry |
| record_format | Article |
| series | The Forestry Chronicle |
| spelling | doaj-art-e668274241cc40669be7f77a4c2d2d7f2025-08-20T04:00:44ZengCanadian Institute of ForestryThe Forestry Chronicle0015-75461499-93152020-07-01960215216410.5558/tfc2020-020Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British ColumbiaGeorge Harper0Kevin Brown1Ministry Forests, Lands, Natural Resource Operations and Rural Development, Resource Practices Branch, Victoria, British ColumbiaKR Brown and Associates, Victoria, British ColumbiaManual brushing is used to minimize the competitive effects of paper birch (Betula papyrifera Marsh) and associated broadleaved trees on young Douglas-fir (Pseudotsuga menziesii var. glauca) in southern interior British Columbia. Effects of brushing broadleaved trees, predominantly birch, on interior Douglas-fir survival and growth were studied on four sites. Treatments were applied when plantations were five to nine years old. Through 10 years post treatment, brushing did not affect Douglas-fir survival, but increase height by 22 % and stem diameter by 31 % and the differences were greater than seen at five years. After 10 years, linear models described a declining Douglas-fir height or diameter with increasing broadleaved tree density. Boundary line analysis was used to describe maximum treatment response to broadleaved density and two distance independent competition indices for birch and broadleaves, combining either cover or density with relative heights (CRH, DRH, respectively). A negative exponential relationship was fit to 10-year Douglas-fir heights and diameters with increasing values CRH or DRH. Competition thresholds for density, CRH and DRH were not apparent. The quantile regression results indicated the 10-year response of young Douglas-fir diameter to brushing occurred primarily with the largest 55 % to 85 % of the population, CRH and DRH respectively.https://pubs.cif-ifc.org/doi/10.5558/tfc2020-020Douglas-fir plantationsbroadleaved vegetationmanual brushingsurvivalheight growthdiameter growth |
| spellingShingle | George Harper Kevin Brown Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia The Forestry Chronicle Douglas-fir plantations broadleaved vegetation manual brushing survival height growth diameter growth |
| title | Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia |
| title_full | Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia |
| title_fullStr | Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia |
| title_full_unstemmed | Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia |
| title_short | Effects of manual brushing on 10-year survival and growth of Douglas-fir in the mixed broadleaf – shrub complex of southern interior British Columbia |
| title_sort | effects of manual brushing on 10 year survival and growth of douglas fir in the mixed broadleaf shrub complex of southern interior british columbia |
| topic | Douglas-fir plantations broadleaved vegetation manual brushing survival height growth diameter growth |
| url | https://pubs.cif-ifc.org/doi/10.5558/tfc2020-020 |
| work_keys_str_mv | AT georgeharper effectsofmanualbrushingon10yearsurvivalandgrowthofdouglasfirinthemixedbroadleafshrubcomplexofsoutherninteriorbritishcolumbia AT kevinbrown effectsofmanualbrushingon10yearsurvivalandgrowthofdouglasfirinthemixedbroadleafshrubcomplexofsoutherninteriorbritishcolumbia |