عنوان مقاله [English]
Land-use and related developments are the results of a complex network of interactions between internal forces (natural-ecological and socio-economic environment)and a set of external factors that can be traced in an interconnected chain. Prerequisite for understanding these developments recognize the fundamental and important factors that shape these changes (Saeedi and Shafiei, 2008). These changes have forced planners in the process of land planning to carefully consider the issue of changes in the spatial system of land-use. Meanwhile, some researchers have focused on understanding land use change independently and based on studying the trend of change. Others have sought to understand the impact of demographic or environmental issues on land use change.
This research is of a fundamental-applied type and relies on both library and field methods and has investigated the factors influencing land-use changes. In the library method, by referring to various scientific sources, including books, articles, scientific reports and related documents, classification techniques, resource evaluation, note-taking and summarizing have been used. According to field research techniques, multi-time remote sensing images and GIS, direct observation and interview methods have been used.
Results and discussion
Kashan, is the significant administrative, political and economic center of Isfahan Province and most-populous cityin the region. Due to its special structure in providing various services and facilities, There are also cities outside the towns, so that perhaps the term "exclusive usurpation of needs" (Ehlers, 2001, 234) in the region can be best attributed to it. The study shows that in the last thirty years (1986-2016) the population and size of the city have expanded that itself has a direct relationship in the uses . Factors affecting land-use change in the central part of Kashan include: Socio-cultural, economic and physical factors.
As indicated earlier, the city of Kashan, due to its important economic position in the region as an important external factor, has affected the land use system of the surrounding villages. Accordingly, the trend of these changes is towards the destruction of more agricultural lands and increasing man-made uses. In 2017, the area of lands built in the central part of Kashan reached 6995.75 hectares. Forecasts show that this figure will be added to 6996 hectares in 2031 which indicates physical-spatial conflicts in the study area. Table 6 shows the matrix of land-use changes during the years 1396-1381 in terms of percentage. The results of land-use changes show that in the study area, the highest change with 17.75% and barren lands with the lowest change of 0.009% had the lowest conversion rate to constructed lands.
According to the research findings, in the study area, several internal and external factors have led to changes in the use of agricultural lands (agricultural and horticultural) from other uses. Also, analysis based on demographic indicators show the polarity of the population in Kashan city and surrounding villages and other villages in the district. Continuation of the current unbalanced spatial-spatial trend have irreversible environmental consequences and, consequently, socio-economic consequences. In addition to intensify urbanization in the region, lead to a sharp rate of migration of villagers to the city and depopulation of villages. This means increasing spatial imbalances in the region. The effects and consequences of this growth, meanwhile, increase the polarity of Kashan city and surrounding villages, which is associated with the focus on changing agricultural lands (agricultural and horticultural) to industrial man-made uses and related production units. Industrial and manufacturing uses, meanwhile, have had far-reaching effects on environmental conditions due to their unbridled and uncontrolled nature. These include consequences such as the expansion of the city in rural areas and agricultural lands around the city, the destruction of small pastures in mountainous and mountainous areas, pollution of water and soil resources, air pollution and human problems caused by these pollutions. In addition, the logical result of agricultural land-use changes in the region exposes pressure on infrastructure networks such as water, gas, electricity, etc. Practical goals should be set to preserve the environment, the independence of the villages and to prevent dispersal. To facilitate the achievement of the mentioned content goals, in the process dimension, it is required to take the necessary measures to formulate the organizational, institutional and managerial structure.