Analysis on spatial-temporal change of cultivated land intensive use in Changsha city

To understand the time serial change law and spatial variation characteristics of cultivated land intensive use in a certain region, according to the statistical and survey data of land use change in Changsha city from 2001 to 2009, aimed at the cultivated land intensive use, the evaluation index system of cultivated land intensive use was tried to be established, which included 3 layers and 12 specific indicators. The principal component analysis was used to evaluate the time serial change law of cultivated land use in each county in Changsha city, fuzzy comprehensive evaluation was adopted to appraise the spatial variation characteristics of cultivated land use in Changsha city. The results showed that the degree of cultivated land intensive use advanced in a wave-like form in municipal districts and Liuyang city from 2001 to 2009; degree of cultivated land intensive use increased rapidly year by year after the early period(2001-2004) of first rising and last falling in Changsha county; degree of cultivated land intensive use continued to increase steadily on the whole in Wangcheng and Ningxiang county. In 2009, the cultivated land in municipal districts and Wangcheng county were in the status of high intensive use, and the comprehensive evaluation value of cultivated land intensive use were 0.8638、0.8456 respectively; cultivated land in Changsha county was in the status of moderate intensive use, and comprehensive evaluation value of cultivated land intensive use was 0.7643; cultivated land in Ningxiang county and Liuyang city were in status of general intensive use, and comprehensive evaluation value of cultivated land intensive use were 0.6902、0.6645 respectively. The integrated using of two methods provides a good reference to study on cultivated land intensive use in similar regions, research results provides decision support for increase the level of cultivated land intensive use in the process of economic fast development in Changsha city.