Effects of species mixtures on growth and stand development of Douglas-fir and red alder
In the Pacific Northwest, a mixture of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) often results when red alder regenerates naturally in planted conifer stands. The relationships among stand structure, tree mortality, tree size, and understory development in...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich |
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todo:paper_00455067_v36_n3_p768_Radosevich2023-10-03T14:51:55Z Effects of species mixtures on growth and stand development of Douglas-fir and red alder Radosevich, S.R. Hibbs, D.E. Ghersa, C.M. Softwoods Vegetation Cascade Head Experimental Forest Cascade Mountains Mixed plantings Tree mortality Hardwoods coniferous forest deciduous tree forest dynamics mixed forest stand dynamics understory Alnus Rubra Planting Pseudotsuga North America Pacific Northwest Alnus rubra Betulaceae Coniferophyta Pseudotsuga Pseudotsuga menziesii In the Pacific Northwest, a mixture of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) often results when red alder regenerates naturally in planted conifer stands. The relationships among stand structure, tree mortality, tree size, and understory development in the two species mixtures were explored at two sites for the first 16 years after planting. Treatments included a range of species proportions, and red alder was either planted simultaneously with Douglas-fir or planting was delayed for 5 years. Red alder was also removed from some simultaneously planted proportions. Both replacement effects (total stand density held constant) and additive effects (stand density doubled) of the interaction were considered. Red alder grew relatively better at Cascade Head Experimental Forest in the Coast Range, while Douglas-fir grew better at H.J. Andrews Experimental Forest in the less temperate Cascade Mountains. Possible production benefits from mixed plantings were examined using two methods of calculation. Potential production benefits from certain planted proportions of the two species occurred at H.J. Andrews Experimental Forest. No planting time or species proportion resulted in yield improvements over monoculture stands at Cascade Head Experimental Forest. Understory species also varied because of differences in site and stand characteristics that resulted from the differences in planting times and species proportions. © 2006 NRC. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Softwoods Vegetation Cascade Head Experimental Forest Cascade Mountains Mixed plantings Tree mortality Hardwoods coniferous forest deciduous tree forest dynamics mixed forest stand dynamics understory Alnus Rubra Planting Pseudotsuga North America Pacific Northwest Alnus rubra Betulaceae Coniferophyta Pseudotsuga Pseudotsuga menziesii |
| spellingShingle |
Softwoods Vegetation Cascade Head Experimental Forest Cascade Mountains Mixed plantings Tree mortality Hardwoods coniferous forest deciduous tree forest dynamics mixed forest stand dynamics understory Alnus Rubra Planting Pseudotsuga North America Pacific Northwest Alnus rubra Betulaceae Coniferophyta Pseudotsuga Pseudotsuga menziesii Radosevich, S.R. Hibbs, D.E. Ghersa, C.M. Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| topic_facet |
Softwoods Vegetation Cascade Head Experimental Forest Cascade Mountains Mixed plantings Tree mortality Hardwoods coniferous forest deciduous tree forest dynamics mixed forest stand dynamics understory Alnus Rubra Planting Pseudotsuga North America Pacific Northwest Alnus rubra Betulaceae Coniferophyta Pseudotsuga Pseudotsuga menziesii |
| description |
In the Pacific Northwest, a mixture of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) often results when red alder regenerates naturally in planted conifer stands. The relationships among stand structure, tree mortality, tree size, and understory development in the two species mixtures were explored at two sites for the first 16 years after planting. Treatments included a range of species proportions, and red alder was either planted simultaneously with Douglas-fir or planting was delayed for 5 years. Red alder was also removed from some simultaneously planted proportions. Both replacement effects (total stand density held constant) and additive effects (stand density doubled) of the interaction were considered. Red alder grew relatively better at Cascade Head Experimental Forest in the Coast Range, while Douglas-fir grew better at H.J. Andrews Experimental Forest in the less temperate Cascade Mountains. Possible production benefits from mixed plantings were examined using two methods of calculation. Potential production benefits from certain planted proportions of the two species occurred at H.J. Andrews Experimental Forest. No planting time or species proportion resulted in yield improvements over monoculture stands at Cascade Head Experimental Forest. Understory species also varied because of differences in site and stand characteristics that resulted from the differences in planting times and species proportions. © 2006 NRC. |
| format |
JOUR |
| author |
Radosevich, S.R. Hibbs, D.E. Ghersa, C.M. |
| author_facet |
Radosevich, S.R. Hibbs, D.E. Ghersa, C.M. |
| author_sort |
Radosevich, S.R. |
| title |
Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| title_short |
Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| title_full |
Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| title_fullStr |
Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| title_full_unstemmed |
Effects of species mixtures on growth and stand development of Douglas-fir and red alder |
| title_sort |
effects of species mixtures on growth and stand development of douglas-fir and red alder |
| url |
http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich |
| work_keys_str_mv |
AT radosevichsr effectsofspeciesmixturesongrowthandstanddevelopmentofdouglasfirandredalder AT hibbsde effectsofspeciesmixturesongrowthandstanddevelopmentofdouglasfirandredalder AT ghersacm effectsofspeciesmixturesongrowthandstanddevelopmentofdouglasfirandredalder |
| _version_ |
1807314829161005056 |