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Application of spectral diversity index for rangeland degradation assessment in North Khorasan province

This study aimed to use a remotely-sensed spectral diversity index called Moving Standard Deviation Index (MSDI) for identifying and assessment of degraded and non-degraded rangelands based on landscape heterogeneity. According to the utilization of rangelands, three sites including reference site (Sarygol National Park), medium grazed site, and over-grazed site with a sampling area of 100 pixels and with similar vegetation, soil type and landform were selected in North Khorasan province. The MSDI index was derived by passing a 3×3 moving standard deviation filter across the 2009 Landsat TM band 3 (red reflectance). To assess the performance of MSDI technique, the widely-used normalized difference vegetation index (NDVI) was also calculated using band 3(red reflectance) and band 4 (near-infrared reflectance). Results showed that over-grazed rangeland had higher mean MSDI and lower NDVI values than medium-grazed and reference site. MSDI difference value was highest in over-grazed rangeland (11), followed by medium-grazed (8) and reference site (6). The results for NDVI index were 0.053, 0.066, and 0.054, respectively. According to T-test statistical analysis, MSDI showed significant differences (p<0.001) between all rangeland sites but NDVI was unable to separate medium-grazed and over-grazed rangelands (p>0.01) due to soil background effects. The results of this study indicate that the MSDI in contrast with NDVI is more sensitive to rangeland landscape degradation and heterogeneity; therefore, it can be used as an appropriate method for assessment of rangeland degradation in Iran.

تحت نظارت وف ایرانی

Application of spectral diversity index for rangeland degradation assessment in North Khorasan province | Dr. Reza Jafari

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تحت نظارت وف ایرانی