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- 2010681359 abstract "This study's objective was to document and describe the current seedling bank of Sitka spruce (Picea sitchensis (Bong.) Carr.) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) stands in southeast Alaska that were partially cut between 1900 and 1984. We investigated the following: (1) What are seedling bank densities? (2) What are seedling size- and age-class distributions? (3) Do seedbed type, treatment, and understory vegetation affect seedling density and species composition? and (4) What are seedling growth rates? Density was high for both Sitka spruce (22,000 seedlings/ha) and western hemlock (223,000 seedlings/ha) and varied widely between sites. There were always fewer spruce than hemlock. Ninety-five percent of spruce and 94 percent of hemlock were less than 0.5 m tall. Spruce had a mean age of 8 years (range 1 to 41 years) and hemlock 19 years (range 1 to 110 years). Both species were four times as common on logs as on undisturbed forest floor. Under closed-canopy conditions at the 15 sites harvested between 1900 and 1958, the average annual height growth rate was 2.3 cm for hemlock and 1.7 cm for spruce. At the two open-canopy sites, harvested in 1983 and 1984, annual height growth rates increased to 8.2 cm for hemlock and 10.2 cm for spruce. Our results suggest that the seedling bank of both species is established and well stocked, thus providing advanced regeneration for the postharvest stand. Because forest managers have increasing concern about effects of clearcut harvesting in Pacific Northwest forest ecosystems and renewed interest in maintaining or restoring biodiversity, other silvicultural methods warrant examination.".
- 2010681359 contributor B12078526.
- 2010681359 contributor B12078527.
- 2010681359 contributor B12078528.
- 2010681359 created "[2010]".
- 2010681359 date "2010".
- 2010681359 date "[2010]".
- 2010681359 dateCopyrighted "[2010]".
- 2010681359 description "Includes bibliographical references (p. 17-20).".
- 2010681359 description "This study's objective was to document and describe the current seedling bank of Sitka spruce (Picea sitchensis (Bong.) Carr.) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) stands in southeast Alaska that were partially cut between 1900 and 1984. We investigated the following: (1) What are seedling bank densities? (2) What are seedling size- and age-class distributions? (3) Do seedbed type, treatment, and understory vegetation affect seedling density and species composition? and (4) What are seedling growth rates? Density was high for both Sitka spruce (22,000 seedlings/ha) and western hemlock (223,000 seedlings/ha) and varied widely between sites. There were always fewer spruce than hemlock. Ninety-five percent of spruce and 94 percent of hemlock were less than 0.5 m tall. Spruce had a mean age of 8 years (range 1 to 41 years) and hemlock 19 years (range 1 to 110 years). Both species were four times as common on logs as on undisturbed forest floor. Under closed-canopy conditions at the 15 sites harvested between 1900 and 1958, the average annual height growth rate was 2.3 cm for hemlock and 1.7 cm for spruce. At the two open-canopy sites, harvested in 1983 and 1984, annual height growth rates increased to 8.2 cm for hemlock and 10.2 cm for spruce. Our results suggest that the seedling bank of both species is established and well stocked, thus providing advanced regeneration for the postharvest stand. Because forest managers have increasing concern about effects of clearcut harvesting in Pacific Northwest forest ecosystems and renewed interest in maintaining or restoring biodiversity, other silvicultural methods warrant examination.".
- 2010681359 extent "20 p. :".
- 2010681359 hasFormat "Also available on the Internet.".
- 2010681359 identifier 664733532.pdf.
- 2010681359 identifier pnw_rp585.pdf.
- 2010681359 isFormatOf "Also available on the Internet.".
- 2010681359 isPartOf "Research paper PNW ; 585.".
- 2010681359 isPartOf "Research paper PNW ; RP-585".
- 2010681359 issued "2010".
- 2010681359 issued "[2010]".
- 2010681359 language "eng".
- 2010681359 publisher "Portland, OR : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station,".
- 2010681359 relation "Also available on the Internet.".
- 2010681359 spatial "Alaska, Southeast".
- 2010681359 subject "SD397.S56 L48 2010".
- 2010681359 subject "Sitka spruce Alaska, Southeast Seedlings.".
- 2010681359 subject "Western hemlock Alaska, Southeast Seedlings.".
- 2010681359 title "The density and distribution of Sitka spruce and western hemlock seedling banks in partially harvested stands in Southeast Alaska / Louise S.Y. Levy, Robert L. Deal, and John C. Tappeiner.".
- 2010681359 type "text".