Vol. 4 No. 2 (2012), SECTION B: LIFE SCIENCES
Vol. 4 No. 2 (2012)

Descriptive crown models for Laurel (Cordia alliodora) under agro forestry systems of the Protected Forest Sumaco, Ecuador

SECTION B: LIFE SCIENCES
Published 2012-12-28
Álvaro Cañadas
Universidad Técnica del Norte
Mykola Korol
Universidad Técnica Estatal Forestal de Ucrania
Carlos H. Zambrano
Universidad Técnica Estatal de Quevedo
Bolívar Camacho
Universidad Técnica de Manabí
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Keywords

crown base
crown model
crown ratio
crown length
crow projection

How to Cite

Cañadas, Álvaro, Korol, M., Zambrano, C. H., & Camacho, B. (2012). Descriptive crown models for Laurel (Cordia alliodora) under agro forestry systems of the Protected Forest Sumaco, Ecuador. ACI Avances En Ciencias E Ingenierías, 4(2). https://doi.org/10.18272/aci.v4i2.103
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Abstract

The ability to describe the shape and size of a tree crown is an important pre-requisite for the estimation of the stability of standing forest trees. The paper describes a crown model for laurel in agro forestry systems of the Protected Forest Sumaco. The empirical data base includes altogether 207 Laurel sample trees. A stem analysis was carried out for each sample tree crown ratio, crown length, crown surface area and crow projection. The sample trees were grown in 3 agro forestry stands which had been subjected to different thinning regimes. To determine the crown width a lineal relationship existed between DBH and crown width. The modification of the models in direction toward a non-lineal relationship not showed improvements in the estimate of this parameter. The crown base, the model proposed by Dursky (2000) was demonstrated the best r2 (0.84). The distortion value of this model was closed to the ideal value of 0 (0.0083) and mean squared error was 1.49 m.

This model was adjusted to the characteristics of Laurel. It was developed a model in order to determinate the crown length. The model presented an r2 of 0.71. This means that, 71% of total variance observed in Laurel can be explained for this parameter. The developed models of this research could be used to establish and calculate other forest attributes of Laurel.

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References

Ministerio del Ambiente del Ecuador, M. 2005. "Evaluación y actualización de las estrategias de desarrollo forestal sustentable del Ecuador, estrategia para el desarrollo forestal sustentable del Ecuador (2005) ". Ministerio del Ambiente del Ecuador (MAE). Quito, Ecuador.

MAGAP 2008. "Plan de reactivación agropecuario 2007-2011". Ministerio de Agricultura, Acuacultura y Pesca del Ecuador: Quito, Ecuador.

Cañadas, A. 2005. "Providing information about natural resources as a base to support the decentralization of the forest sector in canton Loreto". Research Centre of Forest Ecology, University Gottingen: Niedersachsen, Alemania.

Cañadas, A.; Arce, L.; Molina, C. 2010. "Growth, yield and performance of teak in silvopastoral system in the lowland western region, ecuador". World Food System A Contribution from Europe: Tropentag. Zurich.

Cañadas, A.; Roca, A. 2011. "Can the reforestation projects stop the extraction of wood from the protected forest chongón-colonche?". Tropentag, Bonn University Development on the Margin.

Van Laar, A.; Akca, A. 1997. "Forest mesuration". Cuvilier Verlag: Gottingen, Deutschland.

Gadow, K.; Hui, G. 1999. "Modeling forest development". Kluwer Academic Publisher.

Gadow, K. 2004. "Forsteinrichtung. steuerung und analyse der waldentwicklung". Beilage zur Vorlesung, Fakultat für Forstwissenschaften und Waldokologie, Universitat Gottingen. Gottingen, Deutschland.

Hasenauer, H. 1994. "Ein einzelbaumwachstumssimulator für ungleichaltrige fichten-kiefern- und buchen- fichtenbestände". Dissertation, Universität für Bodenkultur, Wien.

Raven, P.; Evert, R.; and Eichhorn, S. 1987. "Biology of plants". Worth Publishers Inc.: New York, NY.

Mitscherlich, G. 1970. "Wald, wachstum und umwelt". Form und Wachstum von Baum und Bestand.

Leuschner, C. 2002. "Lebensraum baumkrone Ü schatzkiste der biodoversitat". Georgia August, Wissenschaftsmagazin der Geor-August-Universitat. Gottingen, Deutschland.

Korol, M.; Gadow, K. 2002. "Zur quantitativen beschreibung von fichtenkronen im gebiet der ukrainischen karpaten". Unveroff, Manuskript, Inst. f. Waldinventur u. Waldwachstum, Univ. Gottingen, Deutschland.

Korol, M.; Gadow, K. 2003. "Ein einheitsschaftmodell für die baumart fichte". Forstwissenschaftliches Centralblatt, 122 (3): 175-182.

Kramer, H. 1988. "Waldwachstumslehre". Verlag Paul Parey. 800.

Gadow, K. 2003. Waldstruktur und Wachstum: Beilage zur Vorlesung im Wintersemester 2003/2004. Universitatsverlag Gottingen: Gottingen, Alemania.

Badoux, E. 1939. "De l"˜influence de divers modes et degres d"˜eclaircie dans les hetraies pines. mittschweiz". AFV. 21 (1): 59-146.

Ung, C. 1993. "Growth and branchiness of picea mariana (mill.) bsp". Canadian Forest Service Modelling Working Group. 200.

Proyecto Gran Sumaco 1998. "Distribución de lluvias en la estación de chalua yacu". PGS/INEFAN/GTZ. 10.

Bendix, J.; Lauer, W. 1992. "Die niederschlagsjahreszeiten in ecuador und ihre klimadynamiche interpretation". Erkunde. 118-134.

Cañadas, L. 1979. "Identificación de sistemas ecológicos en la región amazónica ecuatoriana". Seminario sobre Manejo de Sistemas Ecológicos y Alternativas de Producción Agro-Silvo-Pastoril, Limoncocha. 16.

Cañadas, L. 1983. "Mapa bio climático y ecológico del ecuador". Editores Asociados Cia. Ltd.: Quito, Ecuador.

Pretzch, H.; Kahn, M. 1998. "Forschungsvorhaben konzeption und konstruktion von wuchs und prognosemodellen für mischbestandenin bayer". Methodische Grundlagen. 279.

Ek, A. 1974. "Dimensional relationships offorest and open-grown stems in wisconsin". Uni. of Wisconsin, Forestry Tes. 7.

Dursky, J. 2000. "Einsatz von waldwachstumssimulatoren für bestand, betrieb und grobregion". Dissertation. 223.

Nagel, J. 1999. "Konzeptionelle Überlegungen zum schrittweisen aufbau eines waldwachstumskundlichen simulationssystems für nordwestdeutschland". Franfurt am Main. 122.

Monserud, R. 1975. "Methodology for simulating wisconsin northern hardwood stand dynamics". Ph.D. Thesis. Univ. ofWisconsin. 156.

Statistica 2004. "User"™s Guide". STATISTICA Version 5.0.

Bortz, J. 2005. "Statistik für sozialwissenschaftler". Springeler-Verlag.

Sterba, H.; Korol, M.; Rossler, G. 2001. "Ein ansatz zur evaluierung eines einzelbaumwachstumssimulators für fichtenreinbestande". Forstwissenschaftliches Centralblatt. 406-421.

Somarriba, E.; Valdiviezo, R.; Vásquez, W.; Galloway, G. 2001. "Survival, growth, timber productivity and agro forestry systems". Agroforestry Systems. 111-118.

Zeide, B. 1983. "The mean diameter for stand density index". Can. J. For. Res. 1023-1024.

Nagel, J. 1997. "Bwin-program for standard analysis and prognosis". User"™s manual for version 3.0, Nidersachsische Forsliche Versuchtanstalt, Gottingen, Deutschland.

Moere, M. 1981. "Crown width and foliage weight of northern rocky mountain conifers". USDA For. Serv. Res. 283.

Hassenauer, H.; Monserund, A. 1996. "A crown ratio model for austrian forest". Forest Ecology and Management. 49-60.

Sterba, H. 1987. "Estimating potential density from thinnings experiments and invetory data". Forest Science. 1022-1034.

Sterba, H. 1995. "Prognausein abstandsunabhangiger wachstumssimulator für gleichaltrige mischbestande". Deutscher Verband Forstlicher Forschungsanstaltensektion Ertragskunde. 173-183.

Krajicek, J.; Brinkman, K.; and Gingrich, S. 1961. "Crown competition. A measure of density". For. Sci. 35-42.

Mitscherlich, G. 1978. "Wald, wachstum und unwelt". Frankfurt am Main, Ed. Sauerlander.

Valentine, H.; Ludlow, A.; Furnival, G. 1994. "Modeling crown rise in even-aged stand of sitka spruce and loblolly pin". For. Ecolog. Manag. 189-197.

Dyer, E.; Burkhart, E. 1987. "Compatible crown ratio and hight models". Can. J. For. Res. 572-574.

Anderson, L.; Sinclair, F. 1993. "Ecological interactions in agroforestry systems". Agrofor Abs. 57-91.

Kramer, H.; Akca, A. 1982. "Leitfaden für dendrometrie und bestandesinventur". J.D. Sauerlander"˜s Verlag. 150.

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