Estimating the Rangeland Vegetation Cover of Tang-e-Sayyad Region (Chaharmahal-o-Bakhtiary Province) Using IRS LISS-III Data

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Rangelands encompass 55% of Iran's territory. Monitoring of such resources is inevitable due to dynamic behavior and extremely high extension. Scanning of land resources data by satellites facilitates monitoring the rangelands. This research was carried out to study the relationships of vegetation indices derived from IRS LISS-III data with vegetation cover of Tange Sayyad region in the Chaharmahal va Bakhtiary Province. Thirty sampling units were selected randomly in the region by considering vegetation types. In each unit 12 plots (2×1.5 m) were selected randomly and the vegetation cover of plots was measured. Satellite data were geometrically and radiometrically corrected. The digital values of the corresponded pixels to each sampling plot were considered for statistics analysis. The results indicated from 24 applied vegetation indices 15 are suitable for estimation of grasses and summation of grasses and forbs covers and 10 indices could be applied for estimation total rangeland vegetation cover. The results also showed that DVI is the most suitable index for estimation of grasses' and summation of grasses and forbs' cover and NDVI was the most suitable index for estimation of total vegetation cover. Estimation of bushes' and forbs' covers independently was not possible due to low development of vegetation cover. The results also indicated possible estimation of grasses', forbs', bushes' and summation of grasses and forbs' yield through their coverage.

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