| Autor: |
Gómez-García E, Fonseca Teresa F, Crecente-Campo F, Almeida Luís R, Diéguez-Aranda U, Huang S, Marques Carlos P |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
iForest - Biogeosciences and Forestry, Vol 9, Iss 1, Pp 72-78 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1971-7458 |
| DOI: |
10.3832/ifor1520-008 |
| Popis: |
Tree height is a key variable in forest monitoring studies and for forest management. However, tree height measurement is time consuming, and the recommended procedure is to use estimates from height-diameter models. Here, we compare height-diameter model forms and approaches for predicting tree height (h) as a function of tree diameter at breast height (d) and additional stand level covariates. Four model forms were evaluated: (i) basic models (which only used d as predictor variable); (ii) generalized models (which used d and stand-level predictor variables); (iii) a mixed-effects model based on the best basic model; and (iv) a mixed-effects model based on the best generalized model. Several alternatives aimed at minimizing height measurement effort were tested in terms of accuracy and applicability. From a practical point of view, the selected generalized model is recommended for estimating the height of maritime pine in Portugal. The results also show that a calibrated basic mixed model provides more accurate results than a basic model locally fitted when the number of h-d observations is limited. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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