Assessment of Land Changes in Tajan River Watershed with Emphasis on Landscape Metrics

Subject Areas : GIS

Fatemeh Rajaei ¹ , Abbas Esmaili Sari ² , Abdolrassoul Salmanmahiny ³ , Majid Delavar ⁴ , Ali Reza Massah Bavani ⁵

1 - PhD Student, Environmental Sciences, College of Natural Resource, Tarbiat Modares University, Tehran
2 - Prof. of Environmental Sciences, College of Natural Resources and Marine Science, Tarbiat Modares.,Tehran * (Corresponding author)
3 - Associated Professor, Environmental Sciences, College of Natural Resource, Gorgan University of Agricultural Sciences and Natural Resources
4 - Associated. Professor, Water ITECT Resources, College of Agriculture, Tarbiat Modares University, Tehran
5 - Associated. Professor, Environmental Sciences, College of Irrigation and Drainage Engineering, University of Tehran

Received: 2015-05-06 Accepted : 2016-06-15 Published : 2020-03-20

Keywords: land use change, land change modeler (LCM), Tajan Watershe, Landscape metrics,

Abstract :

Introduction: Land cover and its configuration in the landscape are crucial components in the provision of biodiversity and ecosystem services. Hyrcanian forests have a long history (arising in the Jurassic Period) and are among the world's most valuable forests; the decline in the Hyrcanian forests is one of the most serious problems of recent years. Material & Method: This study aims at comparing multi-temporal land use and landscape pattern analysis using satellite images from 1984, 2001 and 2010. Land use and spatial structures were predicted for future time horizons in the Tajan Watershed by land change modeler (LCM). Also, the landscape patterns were calculated by FRAGSTATS 4.2. Result & Discussion: The results show that forest was the dominant land cover (72% of area in 1984 and 46% in 2040) in the study area. The total area of forest was 8/4 times higher than the agriculture land cover in 1984 and 1.8 times in 2040. The Largest patch Index (LPI) shows forest lands as dominant cover in the whole period. Also proximity index (PROX) in agriculture and pasture land use increase during 1984 to 2040. The Edge density (ED) will increase in the future for three land uses. The edge density will increase at forest land use from 2010 to 2040. An informed vision on past, present and future forest area dynamics may help guide and prioritize international decisions aimed at reducing forest loss.

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