The Research On Evolution Mechanism Of Landscape Structure Dominanted By Urbanization

Based on the remote sensing images of the year of 1996, 1999, 2002 and 2005, taking GIS as the data processing platform, these data of urban landscape types in different year are obtained, through on-the-spot investigation and analyzing the map of land use current situation and topography. According to these data, through making reference to various materials and consulting experts, applying the principle of landscape ecology, urban ecology, urbanology, urban planning and statistical analysis, taking the urban landscape of the inside lines of Yiwu City developed in 2003 as an example, Evolution mechanism of Landscape structure which is dominanted by urbanization are studied. The results of research are as following:(1) There is a dramatic reduction of half-natural half-artificial landscape which is accompanied by the decrease of natural landscape and the increase of artificial landscape year by year. During the year of 1996 to 2005, the area of natural landscape has lost 145.58 hm~2 , which rate of decrease descends from 8.95% to 7.30%, and whose annual gradient is 2.05%. The area of half-natural half-artificial landscape has lost 3545.32 hm~2, which area of decrease is more than half in 1996, and whose annual gradient is 6.17%. The area rate of half-natural half-artificial landscape droped from 72.33% to32.17%. While the area of artificial landscape has been increased by 3690.89 hm~2, the area rate of which is increased from 18.72% to 60.53%, and whose annual gradient was 24.82%. It shows that in terms of the urban landscape evolution, the process of urbanization is indeed the urbanization of natural landscape and half-natural half-artificial landscape.(2) Agro-landscape is the most important source of the landscape evolution in research area, while the landscape in construction is the main convergence of the landscape evolution. Agro-landscape decreased for 843.64 hm~2, 1516.47 hm~2, 1185.21 hm~2 in three stages, respectively. The following source of landscape evolution is water landscape and forest landscape. The residential landscape in suburbs has also become the source of landscape evolution in the year 2002-2005. The landscape in construction increased for 327.26 hm~2, 734.14 hm~2, and 702.54 hm~2 in the same three stages, respectively. The following convergences of the landscape evolution are industrial landscape and residential landscape in urban. The results show that the landscape evolution is the process of expanding industrial landscape and residential landscape at the expense of agricultural landscape in the process of urbanization of Yiwu city,(3) The evolution of greenbelt landscape was prominently featured among the landscape factors. The rate of greenbelt increase is 1735.80% in the period of research, and its annual increase rate reaches 192.87%. As for the annual increase or decrease rate of other landscape factors, the sequence of rate are successively as follows: the landscape in...