Ozolinši tüvemoodustaja matemaatiline analüüs ja modifitseerimise võimalused Hiiumaa männikute näitel

Padari, Allar

doi:10.2478/fsmu-2020-0004

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Based on the obtained diameters, heights and tree numbers, the volumes of different assortments were estimated using the Ozolinš' stem taper curve [37,38]. The algorithm (Equations ( 9) and ( 10)) for calculating assortments based on the Ozolinš' stem taper curve was published by Padari [39]; 4.…”

Section: Growths and Assortment Volumes In Case Of Different Management Scenariosmentioning

confidence: 99%

The Value of Hybrid Aspen Coppice Investment under Different Discount Rate, Price and Management Scenarios: A Case Study of Estonia

Hepner

Lukason

Lutter

et al. 2021

Forests

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Hybrid aspen is one of the most promising tree species for short-rotation forestry in Northern Europe. After the clearcutting of hybrid aspen plantation, the next generation arises from root and stump sprouts. The economic feasibility of different management strategies of hybrid aspen coppice stands has not yet been comprehensively evaluated in Northern Europe. We compared the land expectation values (LEVs) of hybrid aspen coppice stands managed according to four scenarios: three early thinning methods (corridor, cross-corridor and single-tree) followed by conventional management and intensive bioenergy production (repeated harvests in 5-year rotations) over a 25-year period in hemiboreal Estonia. We considered the historic price volatility of aspen wood assortments under various discount rates (1–20%). We found that the 25-year rotation with different early thinning methods was more profitable than short bioenergy cycles in the case of low discount rates (<5%). The LEV of short coppice cycles for only bioenergy production became more profitable in comparison with those by thinning methods, when higher discount rates (>10%) were applied. Hybrid aspen coppice stands can be managed profitably, but more risks are taken when the management strategy focuses only on bioenergy production.

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Section: Growths and Assortment Volumes In Case Of Different Management Scenariosmentioning

confidence: 99%

The Value of Hybrid Aspen Coppice Investment under Different Discount Rate, Price and Management Scenarios: A Case Study of Estonia

Hepner

Lukason

Lutter

et al. 2021

Forests

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“…There are some studies and applications of the H-D relationship available that are applied in the Estonian context. Padari [16,17], for example, proposed an H-D function at the individual tree level for various species that were dependent on D as a predictor for estimating H, without considering other stand variables for managed forest conditions. Nilson [18] included the mean height and the quadratic mean diameter of trees within stands in his function.…”

Section: Introductionmentioning

confidence: 99%

The Possibility of Using the Chapman–Richards and Näslund Functions to Model Height–Diameter Relationships in Hemiboreal Old-Growth Forest in Estonia

Nigul

Padari

Kiviste

et al. 2021

Forests

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In light of the difficulties in stand volume estimation of natural forests, we analyzed height–diameter relationships and derived a set of height estimation equations for volume estimation for naturally developing forest ecosystems, using the Järvselja old-growth and the Laeva commercial forest in Estonia as a case study. This contribution presents an approach to model individual tree height–diameter relationships for Scots pine, common aspen, silver and downy birch, Norway spruce, black alder, gray alder, linden species, European ash, Norway maple, deciduous species and coniferous species in multi-size and mixed-species naturally developing stands in Estonia. Single-tree-level data were collected in 2013. Two methods were used to obtain stand-level data: whole surface inventory and partial surface inventory. To model the height–diameter relationship in naturally developed mixed-species forest stands in order to predict single tree height based on observed diameter at breast height, we applied nonlinear mixed models where we applied the Chapman–Richards and Näslund models as fixed-effects and the influence of the species contribution at the sites as random effects. The fixed-effects followed a set of criteria: (1) height starts at h = 1.3; d = 0; (2) the applied functions are monotonically increasing with a clear inflection point and 3) the fixed-effect model has an asymptotic value) in a naturally developed mixed-species forest.

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Composition of live, dead and downed trees in Järvselja old-growth forest

et al. 2021

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The study area is in the Järvselja Training and Experimental Forest Centre, Estonia. The conservation of Järvselja old-growth forest started in 1924 when the area was excluded from all management activities and left to natural development. The aim of this study is to analyse the methods for calculating single tree height, tree stem lateral surface area, tree volume and carbon content for standing live trees, standing dead trees and for downed deadwood in old-growth forests. The study used the data of 6205 live trees, 1119 snags, 270 standing dead trees and 2983 deadwood trunks from the measured area. The most abundant tree species in Järvselja old-growth forest were Norway spruce and linden. During the last hundred years, the number of dominating tree species has increased slightly. The standing volume of birch, common aspen and Scots pine have been declining while for linden and black alder it has been increasing. In the comparison of tree height curves, the best results were obtained with the Näslund function, however, the Chapman-Richards function with fitting showed slightly better results for two tree species.

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Ozolinši tüvemoodustaja matemaatiline analüüs ja modifitseerimise võimalused Hiiumaa männikute näitel

Cited by 4 publications

References 22 publications

The Value of Hybrid Aspen Coppice Investment under Different Discount Rate, Price and Management Scenarios: A Case Study of Estonia

The Value of Hybrid Aspen Coppice Investment under Different Discount Rate, Price and Management Scenarios: A Case Study of Estonia

The Possibility of Using the Chapman–Richards and Näslund Functions to Model Height–Diameter Relationships in Hemiboreal Old-Growth Forest in Estonia

Composition of live, dead and downed trees in Järvselja old-growth forest

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