A site dependent top height growth model for hybrid aspen

Journal of Northeast Forestry University - Tập 24 - Trang 691-698 - 2013
Tord Johansson1
1Department of Energy and Technology, Swedish University of Agricultural Sciences, Uppsala, Sweden

Tóm tắt

In this study height growth models for hybrid aspen were developed using three growth equations. The mean age of the hybrid aspen was 21 years (range 15–51 years) with a mean stand density of 946 stems ha−1 (87–2374) and a mean diameter at breast height (over bark) of 19.6 cm (8.5–40.8 cm). Site index was also examined in relation to soil type. Multiple samples were collected for three types of soil: light clay, medium clay and till. Site index curves were constructed using the collected data and compared with published reports. A number of dynamic equations were assessed for modeling top-height growth from total age. A Generalized Algebraic Difference Approach model derived by Cieszewski (2001) performed the best. This model explained 99% of the observed variation in tree height growth and exhibited no apparent bias across the range of predicted site indices. There were no significant differences between the soil types and site indices.

Tài liệu tham khảo

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