A compendium of forest growth and yield simulators for the Pacific coast states

Ritchie, Martin W.

doi:10.2737/psw-gtr-174

Cited by 17 publications

(14 citation statements)

References 70 publications

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“…be modified slightly to track the creation and loss of snags internally. Mortality is generally tracked by reducing tree expansion factors, as mortality equations predict a speciFic probability or pmportion of mortality (Ritchie 1999). …”

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confidence: 99%

Snag longevity under alternative silvicultural regimes in mixed-species forests of central Maine

Garber¹,

Brown²,

Wilson³

et al. 2005

Can. J. For. Res.

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Predictions of snag longevity, defined here as the probability of snag survival to a given age, are key to designing silvicultural regimes that ensure their availability for wildlife and form an important component of carbon flow models. Species, diameter at breast height, stand density, management regime. and agent of tree mortality were assessed for their effect on snag longevity in a long-term siivicultural study on the Penobscot Experimental Forest in central Maine. Snag recruitment and fall data from USDA Forest Service inventories between 1981 and 1997 were analyzed using parametric survival analysis. A Weibull model fit the data best, indicating a significant lag time followed by rapid . fall rates. Half-times varied among species. with Thuja occidentalis L. having the longest (10 years) and Picea species the shortest (6 years). Snag longex~ity was signilicantly greater with increasing diameter and decreased with increasing stand density. Agent of mortality and silvicultural treatment were also significant. Two models were developed for estimating probability of snag survival over time. one that included predictor variables unique to the silvicultural systems study on the Penobscot Experimental Forest and one using predictor variables available in most standard inventories. Snag survival models can easily be incorporated into comprehensive forest dynamics models to facilitate estimates of wildlife habitat structure and carbon flow. R b m B : La prediction de la longevit6 des chicots, dhfinie ici c o m e Ctant la probabilite de survie dles chic06 est un Clement cl6 de la conception des regimes sylvicoles qui en assurent la disponibilitk pour la faune et constitue une composante importante des modkles de flux de carbone. L'espitce, le dinmktre 2 hauteur de poitrine. la densite du peuplement, le r6gin1e d'itn~Cnagement ed la cause de mortalit6 des arbres ont 6t6 Cvalu6s pour connaftre lew effet sur la long6viti5 des chicots dans le cadre d'une etude sylvicole h long terme B la For& exp6rimeatale de Penobscot situke dam le centre du Maine, aux ~t a t s -~n i s .Les donnCes d'inventaue de 1981 A 1997 du USDA Forest Senice sur le recrutelaeht et la chute des chicots ont 6t6 Ctudihes h I'aide d'une analyse parametrique de survie. Un nnoditle de Weibull s'est le mieux ajust6 aux donnCea ce qui indique qu'il y a une importante periode de latence suivie par un taux de chute rapide. La demi-vie des chicots variait selon I'espsce, avec la plus longue (10 am) associh B Thuja occidentaZis L. et la plus courte (6 ans) & Picea spp. La longkvit6 des chicots etait significativement plus forte lorsqne leur diamktre augmentait et plus faible lorsque la densit6 du peuplement augmentait. La cause de mortalitt? et le traitement sylvicole etatent Cgalemen~ importants. Deux modeles ont C d dCvelopp6s pour estimer la probabilite de suwie des chicots en fonction du ;temps. Le premier inclut des variables de prediction propres aux systkmes sylvicoles de la Fort% exp6ri-mentale de Penobscdt et le deuxikme utilise des variab...

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confidence: 99%

Snag longevity under alternative silvicultural regimes in mixed-species forests of central Maine

Garber¹,

Brown²,

Wilson³

et al. 2005

Can. J. For. Res.

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“…FIA plots (USFS, 2008) from seven years of annual inventories (2001)(2002)(2003)(2004)(2005)(2006)(2007) were processed to calculate current carbon storage and sequestration on all forestlands, both private and public, and private non-reserved timberlands. The four variants of the Forest Vegetation Simulator (FVS) were used to estimate growth and mortality of plots (Ritchie, 1999). The plots were grown for the standard 10-year increment.…”

Section: Estimated Carbonmentioning

confidence: 99%

Sustaining Working Rangelands: Insights from Rancher Decision Making

Roche

Schohr

Derner³

et al. 2015

Rangeland Ecology & Management

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Acknowledgements in 1979, and 2003. In 2008, the Federal Farm Bill added a provision to federal law that required states to do assessments of forest resources. These assessments are to identify key issues and define the status and trends across all forest lands in each state. To the extent possible, spatial areas (called priority landscapes) are to be delineated that help focus investments and other programs to deal with associated issues. A separate document must also be prepared that presents strategies to address issues and priority landscapes identified in the assessment. The intent of the 2010 Forest and Range Assessment is to meet both the state and federal mandates, hence it covers both forest and rangeland resources, on private as well as publically managed lands.In many ways, this assessment portrays a continuation of past trends of impacts from wildfire, development, forest pests, and exotic invasive species. However, there are also relatively new or markedly increasing potential threats from renewable energy infrastructure, off highway vehicle use, and climate change. Finally, traditional as well as new opportunities exist for shaping future conditions through emerging markets for biomass and other renewable energy sources; carbon, niche markets, and ecosystem services; innovative regional and local partnerships and strategies to conserve and manage open space and working landscapes for both commodity production and non-market benefits; and various tools, policies, programs and incentives to positively influence land management and use decisions. PRESENTATION OF THE 2010 ASSESSMENT SUMMARY OF CHAPTER RESULTSKey findings and highlights from each topic covered in this assessment are supplied in this section, organized according to the guidance given by the Forest Service's Redesign program. These highlights do not cover the topics in detail, but provide a quick review of topic coverage to serve as a supplement to the strategy report. ASSESSMENT California's Forests and Rangelands 6 CHAPTER OVERVIEWMany of the same ecosystems that have been hard hit by historical development are projected to be further impacted by development in the near future, particularly in and around the largest urban areas. The state's already large population is still growing, particularly in Southern California, and an estimated 3.9 million residents will be added over the next decade. This ongoing trend will maintain or increase pressure for land development that can increasingly compromise ecosystems across the state.Tools to address development threat to ecosystems, include land acquisition, easements, zoning policies, and policies to promote in-filling of existing developed areas.This chapter has a single spatial analysis which examines the threat of near-term development to ecosystems. Key Findings CHAPTER OVERVIEWThe concept of "working landscapes" was developed to encompass the idea that lands used for commodity production also provide crucial ecosystem services and that future demands make it essential that these system...

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“…(Ritchie, 1999). Since data collection and analysis procedures differ among these models, comparisons of growth responses that may be due to geographic variation of the species are not possible.…”

Section: Introductionmentioning

confidence: 98%