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Generalized or general mixed-effect modelling of tree morality of Larix gmelinii subsp. principis-rupprechtii in Northern China
- Source :
- Journal of Forestry Research. 32:2447-2458
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Tree mortality models play an important role in predicting tree growth and yield, but existing mortality models for Larix gmelinii subsp. principis-rupprechtii, an important species used for regeneration and afforestation in northern China, have overlooked potential regional influences on tree mortality. This study used data acquired from 102 temporary sample plots (TSPs) in natural stands of Prince Rupprecht larch in the state-owned Guandi Mountain Forest (n = 67) and state-owned Boqiang Forest (n = 35) in northern China. To model stand-level tree mortality, we compared seven model forms of county data. Three continuous (dominant height, plot mean diameter, and basal area per hectare) and one dummy variable with two levels (region) were used as fixed effects variables. Tree morality variations caused by forest blocks were accounted for using forest blocks as a random effect in selected models. Results showed that tree mortality significantly positively correlated with stand basal area and dominant height, but negatively correlated with stand mean diameter. Incorporating both the dummy variables and random effects into the tree mortality models significantly increased the fitting improvements, and Hurdle Poisson mixed-effects model showed the most attractive fit statistics (largest R2 and smallest RMSE) when employing leave-one-out cross-validation. These mixed-effects dummy variable models will be useful for accurately predicting Larix tree mortality in different regions.
- Subjects :
- 0106 biological sciences
Larix gmelinii
0303 health sciences
biology
Forestry
biology.organism_classification
Poisson distribution
Random effects model
01 natural sciences
Basal area
03 medical and health sciences
symbols.namesake
Tree (data structure)
Dummy variable
symbols
Afforestation
Larch
030304 developmental biology
010606 plant biology & botany
Mathematics
Subjects
Details
- ISSN :
- 19930607 and 1007662X
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Journal of Forestry Research
- Accession number :
- edsair.doi...........97423c6542ab5ac2ba8928fecae27d1d