Keywords
fixed area sampling
basal area
dasometry
simulation
How to Cite
##article.highlights##
- Angular sampling was evaluated in the determination of dasometric variables in Tectona grandis.
- The fixed area and shape plot required more work time.
- The Bitterlich angular count was accurate and more efficient than the fixed area plot method.
- In young T. grandis plantations a basal area factor of 2 is recommended.
Abstract
Introduction: Sampling by fixed area plots is the usual practice in forest inventories, despite the considerable time involved. An alternative method of sampling is the angle count or Bitterlich method.
Objective: To evaluate the accuracy and efficiency of the angle sampling method for the determination of dasometric variables in teak (Tectona grandis L. f.) plantations.
Materials and methods: In a three-year teak plantation, 21 circular plots of 500 m2 were established. In each plot, the diameter at breast level, the height and position of each tree, the working times, the number of trees per hectare, the diameter of the average basal area, the total basal area, the average Lorey level and the total volume were determined. Angular sampling was simulated using basal area factors (BAF) of 0.5, 1, 1.5 and 2. The estimates of the variables for each BAF and fixed area plots were compared using ANOVA and the relative efficiency was determined.
Results and discussion: The ANOVA did not detect significant differences (P < 0.05) in the estimation of dasometric variables between sampling types, which demonstrates that the angular method is accurate. The fixed area and shape plot required more working time (P < 0.05). The relative efficiency of the angular method was between 4.5 and 11 times higher than that of fixed area plot. The ideal BAF in young teak plantations was equal to two.
Conclusions: Angular counting is accurate and more efficient for estimating dasometric variables in young teak plantations.
References
Aguilar, F. J., Rivas, J. R., Nemmaoui, A., Peñalver, A., & Aguilar, M. A. (2019a). UAV-Based digital terrain model generation under leaf-off conditions to support teak plantations inventories in tropical dry forests. A case of the Coastal Region of Ecuador. Sensors, 19(8), 1934. doi: 10.3390/s19081934
Aguilar, F. J., Nemmaoui, A., Peñalver, A., Rivas, J. R., & Aguilar, M. A. (2019b). Developing allometric equations for teak plantations located in the Coastal Region of Ecuador from terrestrial laser scanning data. Forests, 10(12), 1050. doi: 10.3390/f10121050
Bitterlich, W. (1952). Die winkelzählprobe. Forstwissenschaftliches Centralblatt, 71(7-8), 215‒225. doi: https://doi.org/10.1007/BF01821439
Burkhart, H. E. (2008). Remembering Walter Bitterlich. Journal of Forestry, 106(2), 61. Retrieved from https://www.researchgate.net/publication/293727952_Remembering_Walter_Bitterlich
Cochran, W. G. (1977). Sampling techniques (3rd. ed.). New York, USA: Wiley.
De Farias, C. A., Soares, C. P. B., de Souza, A. L., & Leite, H. G. (2002). Comparação de métodos de amostragem para análise estrutural de florestas ineqüiâneas. Revista Árvore, 26(5), 541‒548. doi: https://doi.org/10.1590/S0100-67622002000500003
Di Rienzo, J. A., Casanoves, F., Balzarini, M. G., González, L., Tablada, M., & Robledo, C. W. (2017). InfoStat. Software estadístico. Argentina: Universidad Nacional de Córdoba, Grupo InfoStat, FCA. Retrieved from http://www.infostat.com.ar
Do Couto, H. T. Z., Bastos, N. L. M., & de Lacerda, J. S. (1993). A amostragem por pontos na estimativa de área basal em povoamentos de Eucalyptus. IPEF, 46, 86‒95. Retrieved from https://www.ipef.br/publicacoes/scientia/nr46/cap07.pdf
Druszcz, J. P., Nakajima, N. Y., Netto, S. P., & Júnior, M. Y. (2010). Comparação entre os métodos de amostragem de Bitterlich e de área fixa com parcela circular em plantação de Pinus taeda. Floresta, 40(4), 739‒754. doi: https://doi.org/10.5380/rf.v40i4.20326
Flores, T., Cabezas, F., & Crespo, R. (2010). Plagas y enfermedades en plantaciones de teca (Tectona grandis L.F.) en la zona de Balzar, provincia de Guayas. Ciencia y Tecnología, 3(1), 15‒22. Retrieved from https://www.researchgate.net/publication/267865035_Plagas_y_enfermedades_en_plantaciones_de_Teca_Tectona_grandis_LF_en_la_zona_de_Balzar_provincia_del_Guayas
Gove, J. H. (2017). Some refinements on the comparison of areal sampling methods via simulation. Forests, 8(10), 393. doi: https://doi.org/10.3390/f8100393
Iles, K. (2003). A sampler of inventory topics: A practical discussion for resource samplers, concentrating on forest inventory techniques. Canada: Kim Iles & Associates.
Instituto Nacional de Meteorología e Hidrología (INAHMI). (2017). Anuario meteorológico. Retrieved August 21, 2019 from https://inamhi.wixsite.com/inamhi/productos
Jerez, M., Vincent, L., Moret, A. Y., & Quevedo, A. (2005). Comparación entre modalidades de muestreo en plantaciones de Pino Caribe en el Oriente de Venezuela. Revista Forestal Venezolana, 49(1), 17‒25. Retrieved from https://www.researchgate.net/publication/234052498_Comparacion_entre_modalidades_de_muestreo_em_plantaciones_de_Pino_Caribe_en_el_oriente_de_Venezuela
Jordan, G. J., Ducey, M. J., & Gove, J. H. (2004). Comparing line-intersect, fixed-area, and point relascope sampling for dead and downed coarse woody material in a managed northern hardwood forest. Canadian Journal of Forest Research, 34(8), 1766‒1775. doi: https://doi.org/10.1139/x04-051
Kenning, S., Ducey, J., Brissette, C., & Gove, H. (2017). Field efficiency and bias of snag inventory methods. Canadian Journal of Forest Research, 35(12), 2900‒2910. doi: https://doi.org/10.1139/X05-207
Kershaw, Jr., J. A., Ducey, M. J., Beers, T. W., & Husch, B. (2016). Forest mensuration (5th ed.). John Wiley & Sons. doi: https://doi.org/10.1002/9781118902028
Lara, C. E. (2012). Aplicación de ecuaciones de conicidad para teca (Tectona grandis L. f.) en la zona costera ecuatoriana. Ciencia y Tecnología, 4(2), 19‒27. doi: https://doi.org/10.18779/cyt.v4i2.67
Lionjanga, D. L., & Pereira, E. (2014). Comparación de los métodos de muestreo casual simples: Bitterlich y Prodan. Revista Forestal Baracoa, 33, 76‒86.
Ministerio de Agricultura y Ganadería (MAG). (2018). Comprimido de la base de datos geográfica catalogada en formato (.shp). Archivo de datos. Retrieved August 21, 2019 from http://geoportal.agricultura.gob.ec/geonetwork/srv/spa/catalog.search#/metadata/a043e691-2f3a-4f8d-8b10-dff650c93ccc
Moscovich, F. A., & Brena, D. A. (2006). Comprobación de cinco métodos de muestreo forestal en un bosque nativo de Araucaria angustifolia Bert. O. Ktze. Quebracho-Revista de Ciencias Forestales, 13, 7‒16. Retrieved from https://www.redalyc.org/articulo.oa?id=48101301
Mulyana, B., Rohman, R., & Purwanto, R. H. (2018). Application of point sampling method in estimation of stand basal area in community forest. Journal of Sylva Indonesiana, 1(1), 45‒54. doi: https://doi.org/10.32734/jsi.v1i1.426
Rice, B., Weiskittel, A. R., & Wagner, R. G. (2014). Efficiency of alternative forest inventory methods in partially harvested stands. European Journal of Forest Research, 133, 261–272. doi: https://doi.org/10.1007/s10342-013-0756-4
Ríos, N., Acosta, V., Gaillard de Benítez, C., & Pece, M. (2000). Comparación entre métodos de muestreo. Investigación Agraria. Sistemas y Recursos Forestales, 9(1), 45‒57. Retrieved from http://www.inia.es/IASPF/2000/vol9/rios.pdf
Šmelko, Š. (2013). Nový Pohľad na Vlastnosti a Použiteľnosť Kruhových a Relaskopických Skusných Plôch pri Inventarizácii a Monitorovaní Lesných Ekosystémov. Lesnícky časopis. Forestry Journal, 59(1), 1‒18. doi: https://doi.org/10.2478/v10114-011-0018-7
White, J. C., Wulder, M. A., Varhola, A., Vastaranta, M., Coops, N. C., Cook, B. D., Pitt, D., & Woods, M. (2013). A best practices guide for generating forest inventory attributes from airborne laser scanning data using an area-based approach. Canada: Natural Resources Canada-Canadian Forest Service-Canadian Wood Fibre Centre. Retrieved from https://cfs.nrcan.gc.ca/pubwarehouse/pdfs/34887.pdf
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