Variability in Older Forest Structurein Western Oregon

Nathan Poage

USDA Forest ServicePNW Research Station

RMP Program

Western Mensurationists’ MeetingFortuna, California

June 19, 2006

Report = http://fresc.usgs.gov/products/papers/1445_Poage.pdfData = http://fresc.usgs.gov/ArcIMS/Website/lsog/viewer.htm

Northwest Forest Plan

Late-Successional Reserves (LSRs)7,533,000 acCongressionally Reserved Areas 7,320,600 acMatrix 3,975,300 acRiparian Reserves 2,627,500 acAdaptive Management Areas 1,521,800 acAdministrative Withdrawn Areas 1,477,100 ac

Total = 24,455,300 ac

Land Use Allocations

LSRs shownin yellow.

?

What are “legitimate” structural targets for young,managed stands in Late-Successional Reserves?

CurrentStructure

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OR090-TS86-014 (eug\tc85\e04388) and photo (d_postdoc\d_bigtree\d_airphoto\site_092\2000-13-43.1-2.jpg)

Unit 1

(48 acres)

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Oregon

Portland

Poage and Tappeiner (2005)

Tree species and size structure of old-growth forests in central western Oregon, USA.

Forest Ecology and Management 204:329-343.

888888888804388 010178000095 0210 204388011 12 2 6 6 304388011 12 3 6 6 6 204388011 16 3 5 6 6 104388011 16 4 5 6 6 6 204388011 16 6 5 6 6 6 6 6 104388011 20 4 5 5 6 6 104388011 20 5 5 5 5 6 6 204388011 20 6 5 5 5 6 6 6 4

BLM District(04 = Eugene)

SaleNumber

Sub-SaleNumber

Species Code(01 = Douglas-fir)

Diameter Class(4 inch classes)

Number of16-foot Logs

Log Grades(if graded)

Number of Trees in Sub-SaleFitting This Diameter and

Log Grade Description

0

1

2

3

4

12 24 36 48 60 72 84

DBH (inches)

Tre

es p

er A

cre

Douglas-fir Cedar Hemlock

Species – Diameter Distributions