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- Title
Effects of contrasting light and soil moisture availability on the growth and biomass allocation of Douglas-fir and red alder .
- Authors
Chan, Samuel S.; Radosevich, Steven R.; Grotta, Amy T.
- Abstract
Examines growth and biomass allocation of individual Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) seedlings grown under contrasting combinations of light and water. Alder growth that was always greater than Douglas-fir; Full sunlight and soil moisture at field capacity that caused large differences in size between the two species; Differences that were smaller with limited light and water; Douglas-fir that allocated a high portion of its biomass to roots under full light and limited water; Red alder that allocated a high percentage to aboveground biomass components under full light and limited water; Red alder growth that responded negatively to water limitation; Red alder that exhibited greater foliage plasticity to light; Species differences in size and allocation in response to resource availability that may determine pathways by which Douglas-fir and red alder interact in a mixed community; Findings that support the hypothesis that the potential of species to use growth-limiting resources is an indicator of competitive ability; Suggestion that red alder and Douglas-fir can co-exist under conditions of full light and limiting soil moisture availability; Douglas-fir's relatively greater tolerances to low light that allow it to better persist in the understory; Red alder's rapid early growth and competitive ability that will be superior under full light and nonlimiting soil moisture conditions.
- Subjects
DOUGLAS fir; RED alder; SEEDLINGS; SUNSHINE; MOISTURE; BIOMASS
- Publication
Canadian Journal of Forest Research, 2003, Vol 33, Issue 1, p106
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/x02-148