Measuring and modeling the crown ratio index for wild Pistachio (Pistacia atlantica Desf.) in Baghe-Shadi protected forest, Yazd province

Document Type : Research Paper

Authors

1 M.Sc. of Forestry, School of Natural Resources, Yazd University, Yazd. Iran

2 Associate Professor of Forestry, Department of Environment, School of Natural Resources, Yazd University, Yazd. Iran

3 Associate Professor of Statistics, Faculty of Mathematics, Yazd University, Yazd. Iran

10.29252/aridbiom.2021.12504.1754

Abstract

The crown ratio is one of the most important attributes of trees for modeling growth and evaluating the competitive environment in forest stands. This research was carried out to determine the crown ratio for wild pistachio. Continuous transect sampling was carried out with the counting limit of 5-cm diameter at breast height. In each transect, the total height of the tree, the height of the crown, the diameter at breast height (DBH) and the elevation were measured. To study the type and severity of the relationship between elevation and DBH with crown ratio, correlation analysis was conducted. For modeling using linear regression analysis techniques, the curve estimation (including simple linear, second, third, linearized logistic, exponential, inverse and power) and nonlinear models (logistic, Richard, Weibull, and exponential) were used. The results showed that the linear model fitted to DBH data in order to predict crown ratio was statistically significant but the R-square was not noticeable (R2 = 0.33). Nonlinear models explained a maximum of 34% of variations in crown ratio with high precision. Elevation from the sea level was not a suitable predictor for the crown ratio. In this study, due to the low stand density, lack of effective competition between trees and the uniformity of the competitive environment, the crown ratio was less affected by independent variables such as DBH. Accordingly, it seems that in the low density forests of the Iran-Touranian region, the development of powerful models to predict the crown ratio will have little success.

Keywords

References

[1]. Adeyemi, A. A., Jimoh, S. O., & Adesoye, P. O. (2013). Crown ratio models for tropical rainforests species in Oban division of the cross river national park, Nigeria. Journal of Agriculture and Social Research (JASR), 13(1), 63-76.
 [2]. Bechtold, W. A. (2003). Crown-diameter prediction models for 87 species of stand-grown trees in the eastern United States. Southern Journal of Applied Forestry, 27(4), 269-278.
[3]. Berrill, J. P., & Dagley, C. M. (2012). Geographic patterns and stand variables influencing growth and vigor of Populus tremuloides in the Sierra Nevada (USA). ISRN Forestry, 2012.
[4]. Bosela, M., Konopka, B., seben, V., Vladovic, J., & Tobin, B. (2014). Modelling height to diameter ratio–an opportunity to increase Norway spruce stand stability in the Western Carpathians. Forestry Journal, 60(2), 71-80.
[5]. Cienciala, E., Apltauer, J., Exnerova, Z., & Tatarinov, F. (2008). Biomass functions applicable to oak trees grown in Central-European forestry. Journal of Forest Science, 54(3), 109-120.
[6]. Daryaei, M.G., Hosseini, S.K., Taheri, K., Mirzaei, J., & Mzbani, A. (2012). Effect of morphological variables of Pistacia atlantica on gum and seed production, Iranian Journal of Biology, 25(2), 303-315. (in Farsi)
[7]. DeYoung, J. (2016). Forest Measurements: An Applied Approach. Open Oregon Educational Resources.
[8]. Fu, L., Zhang, H., Lu, J., Zang, H., Lou, M., & Wang, G. (2015). Multilevel nonlinear mixed-effect crown ratio models for individual trees of Mongolian Oak (Quercus mongolica) in northeast China. PloS one, 10(8), e0133294. doi:1371/10/journal.pone.0133294.
[9]. Geravand, Y., Hosseini, S.M., Ahmadi, K., Ghomi Avili, A., & Ahmadi, A. (2016). Investigating the structure of wild pistachio stands in protected and non-protected areas of Bagh-Shadi forest, Yazd, Journal of natural ecosystems of Iran, 7(2), 89-101. (In Farsi)
[10]. Holdaway, M. R. (1986). Modeling tree crown ratio. The Forestry Chronicle, 62(5), 451-455.
]11]. Jiang, L. C., & Liu, R. L. (2011). Segmented taper equations with crown ratio and stand density for Dahurian Larch (Larix gmelinii) in Northeastern China. Journal of Forestry research, 22(3), 347-352.
[12]. Kiani, B. (2017). Forest Biometrics: Sampling Designs and Measurement Methods in Forest Sciences. Pelk Press, Tehran. (In Farsi)
[13]. Leites, L. P., Robinson, A. P., & Crookston, N. L. (2009). Accuracy and equivalence testing of crown ratio models and assessment of their impact on diameter growth and basal area increment predictions of two variants of the Forest Vegetation Simulator. Canadian Journal of Forest Research, 39(3), 655-665.
[14]. Makela, A., & Valentine, H. T. (2006). Crown ratio influences allometric scaling in trees. Ecology, 87(12), 2967-2972.
[15]. Medhurst, J. L., & Beadle, C. L. (2001). Crown structure and leaf area index development in thinned and unthinned Eucalyptus nitens plantations. Tree Physiology, 21(12-13), 989-999.
[16]. Monserud, R. A., & Sterba, H. (1996). A basal area increment model for individual trees growing in even-and uneven-aged forest stands in Austria. Forest ecology and management, 80(1-3), 57-80.
[17]. Mosleh Arani, A., Mollakhalili, M.H., & Kiani, B. (2016). Investigation on important causes of beetle attack to Amygdalus scoparia trees in central Zagros, Bagh-shadi, Harat, Yazd. Iranian Journal of Zagros forests Researches, 3(1), 75-86. (in Farsi)
[18]. Oyebade, B. A., & Onyeoguzoro, T. C. (2017). Tree crown ratio model for Hevea brasiliensis (A. juss.) plantation in Rubber Research Institute of Nigeria (RRIN) Edo State, Nigeria. World Scientific News, 70(2), 97-110.
[19]. Peter, A. O., & Oluwafemi, O. A. (2008). Interim Crown Ratio Models for a Mixed Tectona grandis and Gmeìina arborea stand in the University of Ibadan, Nigeria. Research Journal of Forestry, 2(1), 34-42.
[20]. Popoola, F. S., & Adesoye, P. O. (2012). Crown ratio models for Tectona grandis (Linn. f) stands in Osho Forest reserve, Oyo State, nigeria. Journal of Forest Science, 28(2), 63-67.
[21]. Sanchez-González, M., Cañellas, I., & Montero, G. (2007). Generalized height-diameter and crown diameter prediction models for cork oak forests in Spain, Investigación Agraria: Sistemas y Recursos Forestales, 16(1), 76-88.
[22]. Singh, A. K., Tripathy, R., & Chopra, U. K. (2008). Evaluation of CERES-Wheat and CropSyst models for water–nitrogen interactions in wheat crop. Agricultural water management, 95(7), 776-786.
[23]. Shcherbakov, M. V., Brebels, A., Shcherbakova, N. L., Tyukov, A. P., Janovsky, T. A., & Kamaev, V. A. E. (2013). A survey of forecast error measures. World Applied Sciences Journal, 24(24), 171-176.
[24]. Sharma, R. P., Vacek, Z., Vacek, S., Podrazsky, V., & Jansa, V. (2017). Modelling individual tree height to crown base of Norway spruce (Picea abies (L.) Karst.) and European beech (Fagus sylvatica L.). PloS one, 12(10), e0186394. https://doi.org/1371/10/journal.pone.0186394.
[25]. Soares, P., & Tomé, M. (2001). A tree crown ratio prediction equation for eucalypt plantations. Annals of Forest Science, 58(2), 193-202.
[26]. Temesgen, H., LeMay, V., & Mitchell, S. J. (2005). Tree crown ratio models for multi-species and multi-layered stands of southeastern British Columbia. The Forestry Chronicle, 81(1), 133-141.
[27]. Toney, C., & Reeves, M. C. (2009). Equations to convert compacted crown ratio to uncompacted crown ratio for trees in the Interior West. Western Journal of Applied Forestry, 24(2), 76-82.
[28]. Weaver, B., & Wuensch, K. L. (2013). SPSS and SAS programs for comparing Pearson correlations and OLS regression coefficients. Behavior research methods, 45(3), 880-895.
[29]. Weiskittel, A. R., Kershaw, J. A., Vanclay, J. K., & Hann, D. W. (2011). Forest Growth and yield Modeling Wiley-Blackwell, university of Tehran press, Tehran.
[30]. Zhao, D., Kane, M., & Borders, B. E. (2012). Crown ratio and relative spacing relationships for loblolly pine plantations. Open Journal of Forestry, 2(3), 101.
Journal of Arid Biome
Volume 10, Issue 2
March 2021
Pages 66-77

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