Monitoring land use changes and vegetation in Damghan watershed
Subject Areas : Natural resources and environmental management
shima nikoo
1
*
,
Peyman Akbarzadeh
2
1 - Desert Studies Faculty, Semnan University
2 - Desert Studies Faculty, Semnan University
Keywords: Vegetation Changes, Damghan watershed, RS, NDVI, land use changes,
Abstract :
Vegetation and land use due to natural and human factors change over time and affect the functioning of the ecosystem. Monitoring of environmental factors changes over time is important to understand the interrelationships between humans and natural phenomena in order to make better decisions about sustainable land management. Remote sensing multispectral images are very useful for gaining a better understanding of the environment. Due to widespread changes in land use and vegetation, the use of remote sensing technology has become an important tool for monitoring changes in vegetation / land use. In the present study, changes in vegetation by NDVI and land use changes in 2000-2020 in Damghan watershed in Semnan province using Landsat 8, 7 and 5 satellite images -OLI, ETM + and TM sensors, eCognition software and GIS identified. The results showed that the area of gardens, urban areas, barren land, and the area of surface water resources due to the construction of the dam have increased 6624, 635, 54757.4 and 453.15 hectares respectively. Also the area of rangeland, forest and agricultural lands have decreased 12976.25, 40438.44 and 9055.62 hectares respectively. The highest values of NDVI are related to 2020 and 2000 with the values of 0.598 and 0.481, respectively, and the lowest values of NDVI related to 2010 and 2020 are 0.406 and 0.359, respectively. The results of NDVI vegetation index during the study period showed that the area of lands with low vegetation has increased by 163798.3 hectares and the area of lands with medium and good vegetation has decreased by 11101.4 and 52796.9 hectares, respectively. Then these changes were evaluated with R software and the results showed that vegetation on 227754 hectares of the study area has decreased, on 358327.11 hectares has been unchanged and finally on 8146.89 hectares has increased.
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