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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Publicado:	2006
Materias:	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 menziesii
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00455067_v36_n3_p768_Radosevich http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00455067_v36_n3_p768_Radosevich
record_format	dspace
spelling	paper:paper_00455067_v36_n3_p768_Radosevich2023-06-08T15:05:13Z Effects of species mixtures on growth and stand development of Douglas-fir and red alder 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. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00455067_v36_n3_p768_Radosevich http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	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 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.
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
publishDate	2006
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00455067_v36_n3_p768_Radosevich http://hdl.handle.net/20.500.12110/paper_00455067_v36_n3_p768_Radosevich
_version_	1768545456649928704

Effects of species mixtures on growth and stand development of Douglas-fir and red alder

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