Estimating stump volume, stump inside bark diameter and diameter at breast height from stump measurements

“…To examine growth increments during each year, increment cores at DBH were collected in the spring of 1991 from 20 trees of all size classes in each plot. Annual ring widths were measured to the nearest 0.01 mm and annual basal area increment was calculated for each tree using DBH inside bark (Kozak and Omule 1992).…”

Section: Measurementsmentioning

confidence: 99%

Ten-year growth response of coastal Douglas-fir on Vancouver Island to N and S fertilization in an optimum nutrition trial

Weetman¹,

Prescott²,

Kohlberger³

et al. 1997

Can. J. For. Res.

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A 27-year-old stand of coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on Vancouver Island was fertilized four times with N as urea at six rates from 0 to 250 kg⋅N ha -1 , with and without S (0-50 kg⋅ha -1 ). Foliar N levels declined in the control plots over the 10-year period, but remained elevated in the fertilized plots. The increase in foliar N concentrations was commensurate with the amount of N added. Stand basal area response increased with increasing rates of N addition. The greatest response in relative basal area net increment was 4.52 m 2 ⋅ha -1 (40%) in plots that received a total of 1000 kg N⋅ha -1 during the 10 years. Over a 60-year rotation, about 62 m 3 of extra wood would be produced under this regime. There was no additional response to S added in conjunction with N, so the N + S plots received only a single application of fertilizer. Mortality was confined to smaller suppressed stems, mostly of species other than Douglas-fir. Foliar N concentrations and basal area increment declined steadily following cessation of fertilization in these plots, but remained greater than those in control plots for the 10-year measurement period. The results suggest that sustained increases in growth response of Douglas-fir can be achieved through repeated additions of N that maintain elevated concentrations of N in foliage.Résumé : Un peuplement de 27 ans de Douglas vert (Pseudotsuga menziesii (Mirb.) Franco) côtier, situé sur l'Île de Vancouver, a été fertilisé quatre fois avec N sous forme d'urée appliquée à six taux différents, de 0 à 250 kg N⋅ha -1 , avec ou sans S (0-50 kg⋅ha -1 ). Les niveaux de N foliaire ont diminué dans les parcelles témoins sur la période de 10 ans mais sont restés élevés dans les parcelles fertilisées. L'accroissement des concentrations de N foliaire était proportionnel à la quantité de N appliquée. L'accroissement de la surface terrière augmentait avec le taux d'apport en N. Le plus fort accroissement net en surface terrière était de 4,52 m 2 ⋅ha -1 (40%) dans les parcelles qui avaient reçu un total de 1 000 kg N⋅ha -1 durant les 10 années. Sous ce régime, environ 62 m 3 supplémentaires de bois serait produit sur une période de révolution de 60 ans. Il n'y avait pas de réponse additionnelle lorsque S était ajouté avec N, alors les parcelles N + S n'ont reçu qu'une simple application de fertilisant. La mortalité était confinée aux tiges supprimées les plus petites, surtout les espèces autres que le Douglas vert. Les concentrations de N foliaire et l'accroissement en surface terrière ont diminué de façon constante suivant la fin de la fertilisation mais sont restés plus élevés que ceux des parcelles témoins pour la période de 10 ans. Ces résultats suggèrent que des accroissements soutenus de la croissance du Douglas vert peuvent être obtenus avec l'ajout répété de N qui maintient des concentrations élevées de N dans le feuillage. [Traduit par la Rédaction]

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“…Predicting volume from stump diameters should be useful to public and private owners of timber. A review of the literature indicated that prediction of dbh from stump measurement is common, but predictions of volume are relatively sparse (Ugurlu & Ö zer, 1977;Bylin, 1982;Demaerschalk & Omule, 1982;Johnson & Weigel, 1990;Kozak & Omule, 1992;Parresol, 1993;Chhetri Khatry & Fowler, 1996;Weigel & Johnson, 1997;Yavuz, 1996Yavuz, , 2000Wiant & Brooks, 2007;Corral-Rivas et al, 2007). The dbh can be estimated from the diameter at stump height with a high degree of accuracy owing to the high correlation between the two variables (Johnson & Weigel, 1990) and this relationship should not change much over time (Wharton, 1984).…”

Section: Introductionmentioning

confidence: 98%

Estimating breast height diameter and volume from stump diameter for three economically important species in Turkey

Özçelık

Brooks

Diamantopoulou

et al. 2009

Scandinavian Journal of Forest Research

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Predicting volume directly from stump dimensions is useful in many situations, such as timber trespass. In the present study, equations for predicting diameter at breast height (dbh) and tree volume from stump diameter outside bark were developed for three economically important tree species in the forest region of Bucak, Turkey. Diameter at breast height was estimated with relatively high accuracy using a simple linear model. Tree volume was estimated with high precision using an exponential equation. Weighted linear and non-linear least squares methods were used to consider heteroscedasticity observed in the volumeÁstump diameter relationships. The results of a non-linear extra sum of squares method and of the F test indicated that different equations are needed for estimating dbh and tree volume from stump diameter outside bark for different species.

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Estimating stump volume, stump inside bark diameter and diameter at breast height from stump measurements

Cited by 7 publications

References 3 publications

Reconstructed old-growth forest stand structure and composition of two stands on the Olympic Peninsula, Washington state

Reconstructed old-growth forest stand structure and composition of two stands on the Olympic Peninsula, Washington state

Ten-year growth response of coastal Douglas-fir on Vancouver Island to N and S fertilization in an optimum nutrition trial

Estimating breast height diameter and volume from stump diameter for three economically important species in Turkey

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