EVALUATION OF HOMOGENEITY OF TREE SPATIAL DISTRIBUTION IN A MIXED MESQUITE (PROSOPIS CINERARIA) STAND IN BARCHAH PROTECTED AREA, HORMOZGAN PROVINCE

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KHOSRAVI E.; ERFANIFARD S.Y.

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Journal: Journal of Wood and Forest Science and Technology Year:2017 | Volume:24 | Issue:2 Page(s): 47-58

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Title

EVALUATION OF HOMOGENEITY OF TREE SPATIAL DISTRIBUTION IN A MIXED MESQUITE (PROSOPIS CINERARIA) STAND IN BARCHAH PROTECTED AREA, HORMOZGAN PROVINCE

Author(s)

KHOSRAVI E. | ERFANIFARD S.Y. | Issue Writer Certificate

Keywords

KOLMOGOROV-SMIRNOV TESTQ1

CHI-SQUARED TESTQ1

SPATIAL PATTERNQ2

MESQUITEQ1

HOMOGENEITYQ2

Abstract

Background and objectives: SPATIAL PATTERN of trees in a stand is the outcome of different processes such as their interactions, seed dispersal, and environmental heterogeneity. In consequence, knowledge of SPATIAL PATTERN of plant species is important for deeper understanding of different hypotheses in ecology. Considering the importance, unbiased recognition of SPATIAL PATTERN of plant species using reliable techniques is essential in ecology. Summary statistics used in point pattern analysis to explore SPATIAL PATTERN of plants are based on the null model of homogeneous Poisson process (Complete spatial randomness: CSR). So it seems necessary to investigate HOMOGENEITY of tree spatial distribution before analyzing their SPATIAL PATTERN. Considering this issue, this study was aimed to evaluate the HOMOGENEITY of tree spatial distribution in a mixed MESQUITE stand in Khalij-Omanian vegetation zone using two methods. Moreover, it was also aimed to investigate the impact of ignoring the CSR null model on SPATIAL PATTERN analysis of trees in the plot.Materials and methods: A 49-ha study plot (700 m´700 m) was selected in a mixed MESQUITE stand in Barchah protected area in Hormozgand province. The spatial location of all trees and shrubs with height>0.5 m was registered and their height and crown area were measured.Furthermore, another plot with the similar number of plants and environmental conditions was simulated with homogeneous spatial distribution and clustered SPATIAL PATTERN of plants. Two methods of CHI-SQUARED TEST based on quadrat accompanied with Pearson residuals and KOLMOGOROV-SMIRNOV TEST were applied to explore HOMOGENEITY of tree spatial distribution.Moreover, homogeneous and inhomogeneous pair correlation functions were used to analyze SPATIAL PATTERNs in two plots.Results: The study plot was covered by 498 trees and shrubs including 149 MESQUITEs, 248 umbrella thorns (Acacia tortilis), and 101 desert thorns (Lycium shawii). The results showed that CHI-SQUARED TEST only with 4´4 quadrats could recognize HOMOGENEITY of the simulated plot. Mean of Pearson residuals also did not characterize the HOMOGENEITY difference of two plots. While KOLMOGOROV-SMIRNOV TEST explored the difference between tree spatial distribution of the true plot (p-value<0.001) and simulated plot (p-value=0.25) compared to homogeneous Poisson process. Although homogeneous g (r) did not show SPATIAL PATTERNs in the true plot, inhomogeneous g (r) revealed the significant clustered SPATIAL PATTERN of plants up to 3 m and dispersed SPATIAL PATTERN at 3.5-10 m spatial scale. In addition, recognized SPATIAL PATTERN in the simulated plot with homogeneous spatial distribution of plants using inhomogeneous g (r) was biased, although homogenous g (r) showed the significant clustered SPATIAL PATTERN of plants up to 15 m distance.Conclusion: In general, it was concluded that KOLMOGOROV-SMIRNOV TEST is a reliable method to assess HOMOGENEITY of plant spatial distribution in the study area. Moreover, it was revealed that efficiency of g (r) in SPATIAL PATTERN recognition of plants was influenced by HOMOGENEITY of their spatial distribution and application of inappropriate form of g (r) resulted in biased SPATIAL PATTERN analysis at the study site.

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APA: Copy

KHOSRAVI, E., & ERFANIFARD, S.Y.. (2017). EVALUATION OF HOMOGENEITY OF TREE SPATIAL DISTRIBUTION IN A MIXED MESQUITE (PROSOPIS CINERARIA) STAND IN BARCHAH PROTECTED AREA, HORMOZGAN PROVINCE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 24(2), 47-58. SID. https://sid.ir/paper/156632/en

Vancouver: Copy

KHOSRAVI E., ERFANIFARD S.Y.. EVALUATION OF HOMOGENEITY OF TREE SPATIAL DISTRIBUTION IN A MIXED MESQUITE (PROSOPIS CINERARIA) STAND IN BARCHAH PROTECTED AREA, HORMOZGAN PROVINCE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2017;24(2):47-58. Available from: https://sid.ir/paper/156632/en

IEEE: Copy

E. KHOSRAVI, and S.Y. ERFANIFARD, “EVALUATION OF HOMOGENEITY OF TREE SPATIAL DISTRIBUTION IN A MIXED MESQUITE (PROSOPIS CINERARIA) STAND IN BARCHAH PROTECTED AREA, HORMOZGAN PROVINCE,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 24, no. 2, pp. 47–58, 2017, [Online]. Available: https://sid.ir/paper/156632/en

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