Determination of appropriate grid dimension for assessment and mapping of woody Species Diversity using Geostatistical method in Zagros Forest, Iran
Journal Title: International Journal of Farming and Allied Sciences - Year 2016, Vol 5, Issue 5
Abstract
The aim of this study was to determine the most suitable grid (dimensions for sampling) according to the percentage of spatial structure and evaluating the accuracy of estimations of woody species diversity using geostatistics in Zagros forests, west of Iran. Sampling was carried out using circular sample plots with area of 1000m2 for 9 grid sizes in 200ha forest area. Experimental variograms were calculated and plotted for Shannon- Wiener and Simpson indices using geo-referenced inventoried plots. The calculated variograms for Shannon- Wiener and Simpson indices with grid dimensions of 150m × 200m, 200m × 200m, 200m × 400m and 150m × 600m showed a strong spatial structure, which fitted by a spherical model. The estimation and mapping for woody species diversity were made by ordinary block kriging and cross-validation results showed that the estimation were accurate. After assigning each sampling time, (E %) 2× T criterion was calculated in order to compare the methods. Sampling grid of 150m×600m for estimating Shannon- Wiener and Simpson indices had a minimum amount of E%2×T. Therefore, the 150m × 600m grid size was proposed as the most appropriate one to estimate woody species diversity in Iranian Zagros Forests.
Authors and Affiliations
A. Zohrevandi, H. Pourbabaei, R. Akhavan, A. E. Bonyad
Keywords
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