Research On Assessing The Intensity Of Urban Industrial Land Use Based On Parcels Of Land

Since the reform and opening up, China has witnessed fast social and economic development and made significant achievements. The growth of population and the continuous process of urbanization cause increasing conflicts between the supply and demand of land. The phenomena of inefficient use and waste of land in the course of our urban industrial land use keep arising, and such extensive use of land further worsens the conflicts. Given the fact that cultivated land is decreasing sharply, the need of land for the city’s development can no longer rely on the city’s the spatial expansion, and a more scientific and effective approach is to use the land intensively. Over the past ten years, the intensive use of urban land has been a hot issue and has made fruitful research achievements.The paper, taking the concepts of intensive use of land and industrial land from the spatial layout and based on the location theory with the concentric zone theory and the multi-center theory, systematically puts forward the indicator system, standards and evaluation models for the intensive use of industrial land at the level of parcels and evaluates the situation of intensive use of business land, light industrial land and heavy industrial land in Hefei city. It adopts qualitative and quantitative methods and adheres to the principals of science, convenience and high efficiency. It has carried out the empirical research and gives some politics. The conclusion is as follows:(1) construct the location model of assessing the intensity of urban industrial land use. Based on the circle theory, concentric zone theory, multi-center theory and etc., supported by the industrial land use data of Hefei’s central urban area, the research delimits spatial circles, namely business and service circle and industry circles, taking into account of the mono-nucleus and multi-nucleus urban development modes. It adopts the qualitative and quantitative methods and assigns value to each circle edge, uses the spatial differential values, sets a certain accuracy, quantifies the urban locations and thus forms the location lines that covers the entire research area. Such methods can combine human control with scientific selection to provide a scientific base for the spatial adjustment of different types of land.(2) construct the models of assessing the intensity of urban industrial land use. Based on the data of industrial land, in the light of the evaluation object that takes the unit of parcel, through the method of grey relational degree, combining the location models, the research constructs the intensive use evaluation indicator system for the business and service land, light industrial land and heavy industrial land, which includes standard values, maximums and minimums with some threshold values. Finally, it determines the subordinating degree function for each indicator and constructs evaluation models for intensive use of industrial land in terms of parcels through the method of relative weight. (3) conduct empirical research on the basis of the research area, the condition of the intensive use of land is generally at a lower level with the percentage of62.46%among all the parcels evaluated; among the three types land use, the percentage of the intensive use of land ranks in a descending order, namely, business land66.64%, heavy industry41.39%and light industry36.02%; The spatial layout of intensive land is generally "intensiveness, over-intensiveness and low non-intensive parcels scatter widely in patches", namely, intensive parcels and over-intensive parcels assembled in the business and service circle while low non-intensive parcels scatter in different pitches and some are relatively fragmented; the levels of the intensive use of industrial land are approximately the same in the four districts. Luyang district and Baohe district differ little with the percentages of67.66%and67.36%, and Shushan district is slightly lower with the percentage of62.08, and Yaohai district is the lowest with the percentage of53.77%; the conditions of intensive use of industrial land vary in different location circles, and the percentage of business land decreases and then increases from the inner circle to the outer circle and the percentage of heavy industrial land maintains the trend of increasing, while the percentage of light industrial land lingers at a low utilization level with a percent of lightly over35%.In conclusion, it is advised that the density of business and service buildings in the urban area should be adequately lowered and the plot ratio and density of building should be increased in the suburbs; the policy of "retreating the heavy industry and forwarding the service industry" should be continued, the layout of industrial land be optimized and the utilization intensity of light and heavy industries be enhanced; the supervision over land use should be further strengthened and land enclosures and unused land, arbitrary change of land use be avoided.