Investigation of Rangeland Changes Based on Landscape Metrics Analysis (Case Study: Kezab Rangelands, Yazd Province, Iran)
محورهای موضوعی : Relationship between Animal and Rangeland
1 - Assistant Professor, College of Agriculture and Natural Resources, Ardakan University, Ardakan
کلید واژه: Rangeland, Yazd, Landscape metrics, Landscape discontinuities, Kezab rangelands,
چکیده مقاله :
Adverse changes in rangeland vegetation can be considered as one of the criteria for land degradation. Some of these changes can be evaluated through monitoring the spatial changes of landscape parameters. This study aimed to investigate the landscape changes inKezab rangelands of Yazd province, central Iran. Landsat satellite images of 1990, 2002, and 2013, and landscape metrics including Total Edge, Edge Density, Mean Shape Index, Number of Patches, Mean Patch Size, and Median Patch Size were used in this study. Landscape fragmentation was analyzed through calculating various metricsof landscape patterns using the FRAGSTATS software. This study was performed with a focus on landscape elements in poor and very poor rangelands. Results indicated a reduction in the area of rangelands with poor conditions and an increase in the size of rangelands with very poor conditions. The results showed that perimeter sum of spots in rangelands increased From 51.6 km in 1990 to 62 km in 2013. This increase in the perimeter showed further destruction of poor rangelands. This process was considerably seen in very poor rangelands and increased from 48.9 km in 1990 to 56 km in 2013. The process of Edge Density index changes confirmed the intensification of desertification in the region. Also, the number of patches in poor and very poor rangelands increased from 23 to 11 and from 4 to 10, respectively. The intensification of destruction has been shown in very poor rangelands. Rangelands were also changed in terms of other landscape parameters, eventually leading to the deformation of rangeland patches and the degradation process has been intensified in this region. According to the results of these studies, landscape changes of rangelands could be assessed at various time intervals to detect the factors affecting rangelands.
Ahern, j. and Andre, L., 2003. Applying landscape ecological concepts and metrics in sustainable landscape planning. Jour., Landscape and Urban Planning, 59: 65-93.
Apan, A. A., Raine, S. R. and Paterson, M. S., 2002. Mapping and Analysis of Changes in the Riparian Landscape Structure of the Lockyer Valley catchment, Queensland, Australia. Jour. Landscape and Urban Planning, 59(1): 43-57.
Barkhordari, J., Zare Mehrjardi, M. R. And Khosroshahi, M., 2005. Land Cover Change Detection in Minab Watershed Using RS & GIS. Jour. soil and water conservation, 1(2): 59-64. (In Persian).
Fatemi, S. B. and Rezaei, Y., 2005. Principles of Remote Sensing. Tehran: Azadeh Publications. (In Persian).
Forman, R. T. T., 1995. Land mosaics: The ecology of landscapes and regions. USA: Cambridge University press.
Ghiasvand, G. h., 1997. Mapping Land Use Change Using Multi-time Satellite Images. MSc Thesis. Tarbiat Modares University. (In Persian).
Iranmanesh, F., 1998. The trend of land Use Change in Northern Kashan. M.Sc. Thesis. Shahid Beheshti University. (In Persian).
Lausch, A. and Herzog, F., 2002. Applicability of Landscape Metrics for the Monitoring of Landscape Change: Issues of Scale, Resolution and Interpretability. Jour. Ecological Indicators, 2(1): 3-15.
Leitao, A. B., Miller, J., Ahern, J. and McGarigal, K., 2006. Measuring Landscapes: A Planners Handbook. Washington D. C: Island Press 250pp.
Matsushita, B., Xu, M. and Fukushima, T., 2006. Characterizing Changes in Landscape Structure in the Lake Kasumigaura Basin, Japan Using a High-Quality GIS Dataset. Jour. Landscape and Urban Planning, 78(3): 241-250.
McGarigal, K., Cushman, S. A., Neel, M. C. and ENE, E., 2002. FRAGSTATS: Spatial pattern analysis program for categorical maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: www.Umass.edu/landeco /research/fragstats/fragstats.html.
McGarigal, K., Marks, B. J., 1994. FRAGSTATS: Spatial Pattern Analysis Program for Quantifying Landscape Structure, v. 2.0. Oregon Forest Science Lab, Oregon State University, Corvallis.
Palmer, R. A. and Rooyent, A. F., 1998. Detecting Vegetation Change in the Southern Kalahari using Landsat TM data. Jour. Arid Environments, 39(2): 143–153.
Peng, Y., Mi, K., Qing, F. and Xue, D., 2016. Identification of the main factors determining landscape metrics in semi-arid agro-pastoral ecotone. Jour. Arid Environments, 124: 249–256
Saffianian, A. R., Mokhtari, Z., Khajedin, S. J., Ziaee, H.R., 2010. The changes analysis of the Land use Shape and size in Isfahan city Using GIs and metrics landscape. Articles Collections of Geomantic 89, National Cartographic Center, Tehran. (In Persian).
Sun, B. and Zhou, Q., 2016. Expressing the spatio-temporal pattern of farmland change in arid lands using landscape metrics. Jour. Arid Environments, 124: 118–127
Tabibian, M., and Dadrast, M. J., 2002. Monitoring Land Use Changes at Fars Dorughzan Catchment, By RS/GIS. Jour. Environmental Studies, 28(29):80-90. (In Persian).
Talebi Amiri, Sh., Azari dehkord, F., Sadeghi, S.H.R., Souf baf, S.R., 2009. Analysis of landscape degradation nebka watershed using landscape ecology metrics. Jour., Environmental Science Quarterly, 6(3): 133-144. (In Persian).
Tagil, S., 2007. Monitor land degrdation phenomena through landscape metrics and ndvi, Jour. applied sciences, 7(14): 1827-1842.
Weng, Y.C., 2007. Spatio-temporal Changes of Landscape Pattern in Response to Urbanization. Jour. Landscape and Urban Planning, 81(4): 341-353.
Zebardast, L., 2004. The Assessment of Anzali watershed change using remote sensing and management approaches. M.Sc. Thesis. Tehran University. (In Persian).
Zhang, Y., Balzter, H., Zou, CH., Xu, H. and Tang, F., 2015. Characterizing bi-temporal patterns of land surface temperature using landscape metrics based on sub-pixel classifications from Landsat TM/ETM+. International Jour. Applied Earth Observation and Geo information, 42: 87–96.
