Recovery Plan for the Northern Spotted Owl - DRAFT
Recovery Plan for the Northern Spotted Owl - DRAFT Recovery Plan for the Northern Spotted Owl - DRAFT
Stand A. No activities (west side open area)150 *500/ 500/5-9 /8-11 294/12-17100ILL5001990 2010 2030 2050Stand B. Low density (west side open area)150 500/ 100/7-11 70/15-21 70/23-31100501990 2010 2030 2050Stand A = No treatmentStand B = Thinning 1992 and 2030*Trees per acre/average diameter (inches) - diameter of largest 5 percentBlack crown = Douglas-fir or western hemlock H AWhite crown = other conifer species Hardwoods AlA shrubsFigure G. 10. A plantation of Douglas-fhr and western hemlock simulated with no thinning and with thinning of small trees at ages20 and 40 years. Numbers of trees per acre, average diameter, and diameter of the lurgest 5 percent of the trees are shown at eachyear. Note the increased crown and understory development as overstory tree density decreases (Oliver et aL 1991).506
Table G.1. Costs per acre or return per acre over 60 years for each silviculturalsystem on each stand (Oliver et al. 1991). Costs assume no timber removal isdone and no risk reduction measures are taken. Returns assume all timber killedis removed (none is left to create snags and logs). Part of the cost of creatingspotted owl habitat, as well as reducing the risk of fires and insects, may be defrayedby selling some of killed trees in each stand. Where some trees are left andothers removed, costs (or returns) would be between values shown here.CostNo Removal(in dollars)ReturnsFull Removal(in dollars)West side 30-year-old standsNo activities system: 0 0Low density system: 340 7,165High density system: 337 7,900West side 70-year-old standsNo activities system: 0 0Multiple canopy strata system: 1,390 14,042Moderate density system: 771 4,866West side open areasNo activities system: 0 0Maintain opening system 310 0Low density system: 422 1,000East side multiple canopy strata standsNo activities system: 0 0Low density system: 1,030 2,129High density system: 742 1,215East side pole standsNo activities system: 0 0Multiple canopy strata system: 2,822 1,777High density system: 1,515 1,862East side open areasNo activities system: 0 0Maintain opening system: 350 0Low density system: 150 0 - - --- -- - .-...1I507
- Page 472 and 473: log and snag density was likely low
- Page 474 and 475: B. Management Effects on StandsMana
- Page 476 and 477: units (underburning or lop/scatter)
- Page 478 and 479: In the higher elevation White Fir a
- Page 480 and 481: growth often increases (Reinhardt a
- Page 482 and 483: 50rcc4*0-cC)2M CmZ13010-yearI ,...*
- Page 484 and 485: In the East Cascades subregion fore
- Page 486 and 487: The introduced disease, white pine
- Page 488 and 489: VI. Conclusionsmortality will resul
- Page 490 and 491: Baker, F.A. 1988. The influence of
- Page 492 and 493: Habeck, J.R. 1990. Old-growth ponde
- Page 494 and 495: Perry, D.A., and J.G. Borchers. 199
- Page 496 and 497: Weatherspoon, C.P., and C.N. Skinne
- Page 498 and 499: 482
- Page 500 and 501: 484
- Page 502 and 503: area, structure, ages, location; ne
- Page 504 and 505: Stand AFigure G.2. A--unthmnned Dou
- Page 506 and 507: figure 0.3. Effects of thinning Dou
- Page 508 and 509: II. Review of Natural Vegetation an
- Page 510 and 511: western hemlock, and sometimes othe
- Page 512 and 513: year intervals (Appendix F). With t
- Page 514 and 515: Live crown ratiobecent)6050IStand A
- Page 516 and 517: Basal area growth continued to incr
- Page 518 and 519: technology probably will allow some
- Page 520 and 521: Stand A. No activities (west side 3
- Page 524 and 525: acre, 4 to 12 inches in diameter),
- Page 526 and 527: allow redwood sprout clumps maximum
- Page 528 and 529: KAge 15 years - 511 trees per acre,
- Page 530 and 531: 6Stems per acre100 _ Stand A. Natur
- Page 532 and 533: Basal Area(square feetper acre)50 1
- Page 534 and 535: * Opening the canopy in small patch
- Page 536 and 537: Drew, T.J. and J.W. Flewelling. 197
- Page 538 and 539: Miller, R.E.; D.L. Reukema, and R.L
- Page 540 and 541: Tappeiner, J.C., P.M. McDonald, and
- Page 542 and 543: 526
- Page 544 and 545: 528
- Page 546 and 547: 6. Timber supply curve and economic
- Page 548 and 549: scientifically credible biological
- Page 550 and 551: E. Summary of Preliminary Estimates
- Page 552 and 553: II. General Economic Principles for
- Page 554 and 555: practices may be able to show how s
- Page 556 and 557: Economic patterns show the efficien
- Page 558 and 559: The sustainable yield concept that
- Page 560 and 561: A. Previously Estimated Economic Co
- Page 562 and 563: County receipts were estimated to d
- Page 564 and 565: B. Potential Social Costs of Owl Co
- Page 566 and 567: The contrast between the behavior d
- Page 568 and 569: 0U1 n1nDTable H.2. Economic depende
- Page 570 and 571: cḻlTable H.4. Economic characteri
Table G.1. Costs per acre or return per acre over 60 years <strong>for</strong> each silviculturalsystem on each stand (Oliver et al. 1991). Costs assume no timber removal isdone and no risk reduction measures are taken. Returns assume all timber killedis removed (none is left to create snags and logs). Part of <strong>the</strong> cost of creatingspotted owl habitat, as well as reducing <strong>the</strong> risk of fires and insects, may be defrayedby selling some of killed trees in each stand. Where some trees are left ando<strong>the</strong>rs removed, costs (or returns) would be between values shown here.CostNo Removal(in dollars)ReturnsFull Removal(in dollars)West side 30-year-old standsNo activities system: 0 0Low density system: 340 7,165High density system: 337 7,900West side 70-year-old standsNo activities system: 0 0Multiple canopy strata system: 1,390 14,042Moderate density system: 771 4,866West side open areasNo activities system: 0 0Maintain opening system 310 0Low density system: 422 1,000East side multiple canopy strata standsNo activities system: 0 0Low density system: 1,030 2,129High density system: 742 1,215East side pole standsNo activities system: 0 0Multiple canopy strata system: 2,822 1,777High density system: 1,515 1,862East side open areasNo activities system: 0 0Maintain opening system: 350 0Low density system: 150 0 - - --- -- - .-...1I507
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