Investigating the Quantitative Trend of Land Changes in Kermanshah Province (Case Study: Gharesou and Mereg Watershed (in years 1984, 2000, and 2016))

Subject Areas : landuse

Fatemeh Mardani Yaghouti ^{1 *} , Mehrdad Khanmohammadi ² , Peyman Karami ³

1 - Msc of Environment science, Faculty of Natural Resources, Guilan University. Iran. *(Corresponding Author)
2 - Assistant Professor, Department of Environmental Sciences, Faculty of Natural Resources, Guilan University. Iran
3 - PhD of Environment science, Faculty of Natural Resources, Malayer University. Iran

Received: 2017-07-22 Accepted : 2017-11-29 Published : 2019-09-23

Keywords: Landscape changes, land use, Gharesou and Mereg Watershed, Fragmentation, Kermanshah Province,

Abstract :

Background and Objectives:  Human activities change land cover at unprecedented speeds and large spatial scales. The rapid changes in ecosystems in recent decades have been more along all the human history and have led to unprecedented changes in ecosystems and environmental performance at local, regional and global scales. This research aims to investigate the process of landscape quantitative changes in Gharesou and Mereg watersheds. Investigation method: For monitoring changes, Landsat satellite imagery of 1984 (TM), 2000 (ETM+) and 2016 (OLI-TIRS) were used. The classification was performed using Artificial Neural Network (ANN) model. Land cover was classified into seven categories. Metrics PLAND, NP (Number of Patch), PD (Patch Density), and ED (Edge Density) at the Level of Class, NP, LPI (Largest Patch Index), CONTAG (Contagion), and SHDI (Shannon's diversity index) were calculated at the level of Landscape for the study area. Results: The results indicate that the highest percentage of the land cover belongs to agricultural lands and then medium rangelands. The numbers of patches of agricultural land in the period of 1984-2004 has increased due to the conversion of rangelands to agricultural lands and then between years 2000-2016 have decreased due to the conversion to medium ranges with a lesser rate. The number of forest patches in the first period has decreased because of conversion to medium rangelands and increased during the second period. Conclusion: The study of the landscape metrics indicates the increase in continuity, the reduction of fragmentation and diversity in the first time period, and in contrast, in the second time period, continuity has decreased and fragmentation and diversity have increased. Given the fact that the process of landscape changes varies over two different periods, it can generally be noted that the fragmentation and diversity of the landscape have declined and the spatial continuity has increased.

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