Modeling diameter distributions of mixed-species forest stands

2014 ◽  
Vol 29 (7) ◽  
pp. 653-663 ◽  
Author(s):  
Fuxiang Liu ◽  
Fengri Li ◽  
Lianjun Zhang ◽  
Xingji Jin
Keyword(s):  
Forest Stands ◽  
Mixed Species ◽  
Mixed Species Forest ◽  
Diameter Distributions

scholarly journals Correction to: Silvicultural prescriptions for mixed-species forest stands. A European review and perspective

2021 ◽  
Author(s):  
Hans Pretzsch ◽  
Werner Poschenrieder ◽  
Enno Uhl ◽  
Gediminas Brazaitis ◽  
Ekaterina Makrickiene ◽  
...  
Keyword(s):  
Forest Stands ◽  
Mixed Species ◽  
European Review ◽  
Silvicultural Prescriptions ◽  
Mixed Species Forest

scholarly journals Modeling of Two Different Water Uptake Approaches for Mono- and Mixed-Species Forest Stands

Forests ◽  
2015 ◽  
Vol 6 (12) ◽  
pp. 2125-2147 ◽  
Author(s):  
Martin Gutsch ◽  
Petra Lasch-Born ◽  
Felicitas Suckow ◽  
Christopher Reyer
Keyword(s):  
Water Uptake ◽  
Forest Stands ◽  
Mixed Species ◽  
Mixed Species Forest

scholarly journals Ecosystem services of mixed species forest stands and monocultures: comparing practitioners' and scientists' perceptions with formal scientific knowledge

2014 ◽  
Vol 87 (5) ◽  
pp. 639-653 ◽  
Author(s):  
Monique Carnol ◽  
Lander Baeten ◽  
Etienne Branquart ◽  
Jean-Claude Grégoire ◽  
André Heughebaert ◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Scientific Knowledge ◽  
Forest Stands ◽  
Mixed Species ◽  
Mixed Species Forest

Modelling Mixed-Species Forest Stands

2017 ◽  
pp. 383-431 ◽  
Author(s):  
Hans Pretzsch ◽  
Thomas Rötzer ◽  
David I. Forrester
Keyword(s):  
Forest Stands ◽  
Mixed Species ◽  
Mixed Species Forest

scholarly journals The potential of mixing timber assets to financially offset negative effects of deer browsing on western redcedar

2015 ◽  
Vol 91 (04) ◽  
pp. 436-443 ◽  
Author(s):  
Verena C. Griess ◽  
Rajat Panwar ◽  
Julie Cool
Keyword(s):  
Western Hemlock ◽  
Investment Risk ◽  
Financial Indicators ◽  
Negative Effects ◽  
Mixed Species ◽  
Financial Return ◽  
Protective Measures ◽  
Western Redcedar ◽  
Risk Return ◽  
Mixed Species Forest

Western redcedar (WRC) is a highly desirable species in British Columbia's Coastal Western Hemlock zone, both from a management and a conservation perspective. However, it is also highly palatable for ungulates. Existing countermeasures against browsing all have high costs and imperfect results in common. We used the portfolio method to display how diversification can help to lower investment risk. Using risk-return ratios of a WRC and Douglas-fir (DF), we derived species portfolios that yield maximum financial return per unit of risk. Financial indicators were calculated based on Monte Carlo simulations, which consider timber price fluctuation and browsing risk. Results show how economic risks of a forest investment could be reduced by creating a species portfolio. The optimum portfolio leading to most beneficial risk-return combination is 75% WRC and 25% DF if browsing is lowered using protective measures that double planting costs; and 30% WRC and 70% DF if no protective measures are applied. Accordingly, the most desirable risk-return combination is that of a mixed-species forest, whereas the 2 species don't have to be grown in intimate mixtures. Our research sketches a path forward that can help to ensure WRC will remain an important asset in BC's timber portfolio.

A finite mixture of two Weibull distributions for modeling the diameter distributions of rotated-sigmoid, uneven-aged stands

2001 ◽  
Vol 31 (9) ◽  
pp. 1654-1659 ◽  
Author(s):  
Lianjun Zhang ◽  
Jeffrey H Gove ◽  
Chuangmin Liu ◽  
William B Leak
Keyword(s):  
Model Fitting ◽  
Mixture Distribution ◽  
Finite Mixture ◽  
Diameter Distribution ◽  
Weibull Distributions ◽  
Forest Stands ◽  
Negative Exponential Function ◽  
Diameter Frequency Distribution ◽  
Negative Exponential ◽  
Diameter Distributions

The rotated-sigmoid form is a characteristic of old-growth, uneven-aged forest stands caused by past disturbances such as cutting, fire, disease, and insect attacks. The diameter frequency distribution of the rotated-sigmoid form is bimodal with the second rounded peak in the midsized classes, rather than a smooth, steeply descending, monotonic curve. In this study a finite mixture of two Weibull distributions is used to describe the diameter distributions of the rotated-sigmoid, uneven-aged forest stands. Four example stands are selected to demonstrate model fitting and comparison. Compared with a single Weibull or negative exponential function, the finite finite mixture model is the only one that fits the diameter distributions well and produces root mean square error at least four times smaller than the other two. The results show that the finite mixture distribution is a better alternative method for modeling the diameter distribution of the rotated-sigmoid, uneven-aged forest stands.

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