Cultivated land changes in urbanization in Shijiazhuang City of Hebei Province in China

Abstract

This paper uses ENVI to convert TM data of the study area in different times and gains 6 first-classes and 20 second-classes combining with unsupervised classification and supervised classification, and then creates land use vector maps of 1995 and 2000. And according to land use data and land use changes matrix gained from RS images, it discusses arable changes and relevant driving forces in the study area in urbanization. This study area is Shijiazhuang City as a whole, including 17 counties, 1 mining district and 5 urban districts Shijiazhuang City lies in the north-east of China and borders on the Taihang Mountains in the west side and on the wide Huabei Plain on the other three sides. As a transportation center, Shijiazhuang City not only develops quickly in urbanization in recent years, but also changes obviously in land use, especially in cultivated land. Therefore, arable changes in urbanization should receive more attention in Shijiazhuang City. Based on RS data of land use, with methods in RS, GIS and statistics, this paper analyzes land use changes in urbanization from 1995 to 2000 in Shijiazhuang City and makes sure of directions of arable changes. At the same time, in term of social economy indexes, it confirms driving forces of arable changes and discusses relationship of changes between urbanization and cultivated land. The study shows, form 1995 to 2000, cultivated land was the core of land use changes in Shijiazhuang City. It decreased in this period. And construction use is the main way of arable decrease which accounted for 52.3%. Agricultural structure adjustment and disaster destroying accounted for 38% and 9.7% respectively. And in construction use, single industry or mining land made up 40%. It was a token of lagging urbanization influence on arable changes.