DETERMINATION OF OPTIMAL PLOT AREA FOR STUDYING SPATIAL STRUCTURAL INDICES IN BEECH FORESTS OF KHEYRUD, NOWSHAHR

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NOURI Z.; ZOBEIRI M.; FEGHHI J.; MARVIE MOHAJER M.R.

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Journal: Journal of Wood and Forest Science and Technology Year:2017 | Volume:23 | Issue:4 Page(s): 46-64

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Title

DETERMINATION OF OPTIMAL PLOT AREA FOR STUDYING SPATIAL STRUCTURAL INDICES IN BEECH FORESTS OF KHEYRUD, NOWSHAHR

Author(s)

NOURI Z. | ZOBEIRI M. | FEGHHI J. | MARVIE MOHAJER M.R. | Issue Writer Certificate

Keywords

FOREST STRUCTUREQ1

SPATIAL POINT STATISTICSQ1

SPATIAL INDICESQ1

BEECH FORESTSQ1

IRANQ3

Abstract

Background and objectives: The quantitative description of FOREST STRUCTURE is considered as one of the most useful working tools in modern forest management and in order to manage these ecosystems optimally, obtaining accurate insight of their structures is necessary. This study aims at evaluating the optimal area of the sample plot for correct and effective estimation of structural parameters of beech stands.Materials and methods: For this purpose, a compartment with an area about 48 hectares in Gorazbon district in research forest of Kheirod, Nowshar, IRAN was selected in which tree species and DBH of all trees with DBH>7 cm were recorded. In addition, for stem mapping of trees, the location of each tree was obtained using azimuth and distance method. The square sample plots with different areas were laid out on the simulated map of study area and nearest neighbor of SPATIAL INDICES (spatial pattern index of Clark and Evans, mingling index, diameter differentiation index, relative mingling index) were then calculated in each sample plot. The calculated indices in each sample plot with different areas were then compared with full inventory data using one-sample t-test.Results: The comparison of resulted SPATIAL INDICES in each of sampling schemes (1000, 1500, 2000, 3000, 4000, 5000, 7500, 10000 and 12500 m2 sample plots) with calculated SPATIAL INDICES for the whole of study area indicated that only SPATIAL INDICES in sample plots with area of 12500 m2 did not show any significant difference with the SPATIAL INDICES for the whole of study area. Values of other SPATIAL INDICES i.e. mingling index, diameter differentiation index, and relativemingling index obtained from 1.25 ha sample plots are in agreement with full inventory data; that is, mingling index represented low species mixtures in the study area and diameter differentiation index was in mid-class, and relative mingling index was greater than one.Conclusion: As long as the topographic and forest site conditions as well as the management system does not change, horizontal structural indices could be investigated with one 1.25 ha sample plot, provided that this sample plot is not established in the margin of compartment and the forest road vicinity.

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APA: Copy

NOURI, Z., ZOBEIRI, M., FEGHHI, J., & MARVIE MOHAJER, M.R.. (2017). DETERMINATION OF OPTIMAL PLOT AREA FOR STUDYING SPATIAL STRUCTURAL INDICES IN BEECH FORESTS OF KHEYRUD, NOWSHAHR. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 23(4), 46-64. SID. https://sid.ir/paper/156895/en

Vancouver: Copy

NOURI Z., ZOBEIRI M., FEGHHI J., MARVIE MOHAJER M.R.. DETERMINATION OF OPTIMAL PLOT AREA FOR STUDYING SPATIAL STRUCTURAL INDICES IN BEECH FORESTS OF KHEYRUD, NOWSHAHR. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2017;23(4):46-64. Available from: https://sid.ir/paper/156895/en

IEEE: Copy

Z. NOURI, M. ZOBEIRI, J. FEGHHI, and M.R. MARVIE MOHAJER, “DETERMINATION OF OPTIMAL PLOT AREA FOR STUDYING SPATIAL STRUCTURAL INDICES IN BEECH FORESTS OF KHEYRUD, NOWSHAHR,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 23, no. 4, pp. 46–64, 2017, [Online]. Available: https://sid.ir/paper/156895/en

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