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Comparative effects of single-tree a...

Webster, Christopher Raymond.

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Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests./
作者:	Webster, Christopher Raymond.
面頁冊數:	180 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-08, Section: B, page: 3531.
Contained By:	Dissertation Abstracts International63-08B.
標題:	Agriculture, Forestry and Wildlife. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3060603
ISBN:	0493763155

Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests.
Webster, Christopher Raymond.

Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests. - 180 p.

Source: Dissertation Abstracts International, Volume: 63-08, Section: B, page: 3531.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2002.

The recent popularity of uneven-aged management as an alternative to clearcutting has prompted a renewed interest in the comparative utility of uneven-aged silvicultural techniques, especially in forest types where both techniques are applicable and where even-aged systems are undesirable because of biodiversity or aesthetic concerns. We examined the influence of single-tree and group selection on productivity and species composition in hemlock-hardwood forests in northeastern Wisconsin. A combination of field and analytical methods was used to assess the influence of canopy openings created by these methods on stand-level production. An empirical forest model was also developed, which integrates understory and overstory productivity.

ISBN: 0493763155Subjects--Topical Terms:

783690
Agriculture, Forestry and Wildlife.

Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests.
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245 1 0 $a Comparative effects of single-tree and group selection on the diversity and productivity of hemlock-hardwood forests.
300 $a 180 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-08, Section: B, page: 3531.
500 $a Supervisor: Craig G. Lorimer.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2002.
520 $a The recent popularity of uneven-aged management as an alternative to clearcutting has prompted a renewed interest in the comparative utility of uneven-aged silvicultural techniques, especially in forest types where both techniques are applicable and where even-aged systems are undesirable because of biodiversity or aesthetic concerns. We examined the influence of single-tree and group selection on productivity and species composition in hemlock-hardwood forests in northeastern Wisconsin. A combination of field and analytical methods was used to assess the influence of canopy openings created by these methods on stand-level production. An empirical forest model was also developed, which integrates understory and overstory productivity.
520 $a The standing crop of whole-tree aboveground biomass per hectare was greater in multiple-tree gaps (80–800 m<super>2</super>) than single-tree gaps (<80 m<super>2</super>) of similar age. However, biomass production approached an asymptote at fairly small opening sizes, and 400–800 m<super>2</super> group-selection openings did not have significantly more biomass per unit area than small-multiple tree gaps (80–100 m<super>2</super>). Similarly, mean tree dimensions, recent height increments, and basal area increments for most species of gap trees approached an asymptote at an opening size of approximately 100 m<super>2</super>. As opening size increased, yellow birch (<italic>Betula alleghaniensis</italic>) superseded hemlock (<italic>Tsuga canadensis</italic>) as the species with greatest relative biomass. However, based on estimates of initial opening area, it appears that midtolerant species, such as yellow birch, require an opening >200 m<super>2</super> to successfully reach the canopy. Consequently, relatively small group-selection openings (200–400 m<super>2</super>) may regenerate a range of species in these forests.
520 $a Growing space efficiency (production per unit area) in these structurally diverse hemlock-hardwood stands increased with increasing canopy position, but within a given stratum declined with increasing crown size. No clear trends were observed with shade tolerance class between the species examined. However, once in the canopy, hemlock was the most efficient and productive species.
520 $a Based on our field data and permanent plot records maintained by Menominee Tribal Enterprises, we developed an empirical forest model (CANOPY). Preliminary model runs and statistical validation tests suggest that CANOPY may be useful for examining the long-term response of hemlock-hardwood forests to various silvicultural prescriptions.
590 $a School code: 0262.
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
690 $a 0478
710 2 0 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertation Abstracts International $g 63-08B.
790 $a 0262
790 1 0 $a Lorimer, Craig G., $e advisor
791 $a Ph.D.
792 $a 2002
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