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Zvirgzdiņš, Andis, 2019. Modelling growth of Norway spruce on former agricultural lands in Latvia. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre

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Abstract

Adequate growth forecasts are essential for forest management planning. In order to make such forecasts, accurate growth models are required. Due to the rapid growth of Norway spruce (L.) Karst. planted on former agricultural lands, existing growth models are unable to predict the development of Norway spruce with sufficient accuracy. Therefore, the aim of this study was to develop new height development and diameter models for Norway spruce up to 15 years of age. Data used in development of the models was obtained from twelve Norway spruce plantations established on fertile agricultural lands located in eastern Latvia. Height development was modelled using dynamic site equations derived using the generalized algebraic difference approach (GADA). In total fifteen different equations were estimated using non-linear least-square regression. Diameter models were developed using multiple linear regression. Subsequently, further development of the stands was simulated using stand-level management simulation tool StandWise of Heureka-DSS.

Of the fifteen tested equations, the best fit and prediction statistics were achieved using Chapman-Richards and Sloboda models. However, the best overall performance was demonstrated by Chapman-Richards model. Diameter was estimating with a linear regression model. Stand level projections showed that MAImax for stands considered in this study varied between 14.7 – 17.6 m3 ha-1 year-1. According to LEV estimates, optimal rotation age of the stands varied between 41 – 48 years.

With the development of height and diameter growth functions, it is now possible to model development of planted Norway spruce stands from 5 years of age. Furthermore, further development of trees with estimated heights and diameters can be modelled using simulation systems such as Heureka-DSS.

Main title:Modelling growth of Norway spruce on former agricultural lands in Latvia
Authors:Zvirgzdiņš, Andis
Supervisor:Nilsson, Urban and Donis, Janis and Barbeito, Ignacio
Examiner:Agestam, Eric
Series:UNSPECIFIED
Volume/Sequential designation:313
Year of Publication:2019
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SM001 Euroforester - Master's Programme 120 HEC
Supervising department:(S) > Southern Swedish Forest Research Centre
Keywords:Norway spruce plantations, young stands, height development, generalized algebraic difference approach, growth simulations
URN:NBN:urn:nbn:se:slu:epsilon-s-10876
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-10876
Subjects:Forestry - General aspects
Language:English
Deposited On:16 Sep 2019 06:03
Metadata Last Modified:17 Sep 2019 10:08

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