Orbit

年度 2017
全部作者 Lam TY, Kershaw JA, Nur Hajar ZS, Abd Rahman K, Weiskittel AR, Potts MD
作者類別 First Author,Corresponding Author
論文名稱 Evaluating and Modeling Genus and Species Variation in Height to Diameter Relationships for Tropical Hill Forests in Peninsular Malaysia
期刊名稱 Forestry
卷數 90
期數 2
起頁 268
迄頁 278
期刊等級 SCI
總頁數 11
發表日期 2017-03-01
摘要 Height–diameter (H–D) models can be used to predict missing tree heights from diameter at breast height measurements for many forest management applications. A major challenge in developing H–D models for tropical forests is many rare tree species with very few observations. This study utilized the taxonomic hierarchy of genus and species as random effects in a non-linear mixed-effects modelling approach to develop species-specific H–D models for 842 species representing 295 genera. Data were collected from eight forest reserves of hill Dipterocarpacae tropical forests in Peninsular Malaysia. Variations of the Wykoff (WYK) and von Bertalanffy-Richards (VBR) models with covariates were evaluated. Results showed that WYK outperformed VBR with the latter having convergence issues and larger root-mean-squared errors than the former. Among the WYK models, weighted WYK with maximum tree height as stand-level covariate (WYK-HMAX-WT) had the best fit, but it underpredicted heights for larger trees. Nonetheless, the mixed-effect modelling strategy behind WYK-HMAX-WT resolved the need to aggregate species during model development by using the strength of the entire dataset to derive parameter estimates, especially for 36 per cent of the 842 species having less than four observations. Lastly, WYK-HMAX-WT has the flexibility of predicting heights on a regional basis, while retaining the capacity to adjust to stand conditions. The outlined approach should work well for other predictive models and/or regions with a high variety of species present.
語言 英文
參考連結 https://academic.oup.com//forestry/article/90/2/268/2605864/Evaluating-and-modelling-genus-and-species?guestAccessKey=3f359fae-84c9-4960-8b1f-14f946e37a10