We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Evaluation of stand-level hybrid PipeQual model with permanent sample plot data of Norway spruce.
- Authors
Kalliokoski, Tuomo; Mäkinen, Harri; Linkosalo, Tapio; Mäkelä, Annikki
- Abstract
The evaluation of process-based models (PBM) includes ascertaining their ability to produce results consistent with forest growth in the past. In this study, we parameterized and evaluated the hybrid model PipeQual with datasets containing traditional mensuration variables collected from permanent sample plots (PSP) of even-aged Norway spruce ( Picea abies (L.) Karst.) stands in Finland. To initialize the model in the middle of stand development and reproduce observed changes in Norway spruce crown structure, the built-in empirical relationships of crown characteristics were made explicitly dependent on the light environment. After these modifications, the model accuracy at the whole dataset level was high, with slope values of linear regressions between the observations and simulations ranging from 0.77 to 0.99 depending on the variable. The average bias ranged between −0.72 and 0.07 m in stand dominant height, -0.68 and 0.57 cm in stand mean diameter, -2.62 and 1.92 m2 in stand basal area, and 20 and 29 m3 in stand total stem volume. Stand dynamics after thinning also followed reasonable closely the observed patterns. Accurate predictions illustrate the potential of the model for predicting forest stand growth and forest management effects in changing environmental conditions.
- Subjects
NORWAY spruce; FORESTS &; forestry; PLANT growth; REGRESSION analysis; PLANT stems
- Publication
Canadian Journal of Forest Research, 2017, Vol 47, Issue 2, p234
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2016-0236