Evaluation Of Cultivated-land Intensive Use And Analysis Of Spatio-temporal Variation

The cultivated land is one of the most important resources in agricultural production. The shortage of cultivated land resources in china is a long-term socio-economic development constrainis, so we must change the extensive land use pattern so as to achieve sustainable use of cultivated land resources. Study on the cultivated-land intensive use is meaningful to improving rational use of limited cultivated land resources and land use efficiency.First,the article applies the comprehensive evaluation method to measure intensive use situation in Jiaozuo. Second, the article analyes the spatio- temporal features of comprehensive factors and cultivated-land intensive use for city and counties in the appraisal foundation.Third,it mersure the cultivated-land intensive use situation in tipycal area of Jiaozuo by fieldwork. Finally, the article will provide a series of measures for improving the cultivated land intensive use.The analytical metheds are AHP, Delphi method, Cluster analysis, Dynamic studies and Comparativeanalysis, etc.The main conclusions are as follows:(1) From the preliminary analysis, the status of cultivated land intensive use in 2009 is good, but the sustainability is poor.(2) According the principle of index system, I select the indexes of input-intensity, use degree, output-effect by analyzing and comparing the influential factors of cultivated land intensive utilization.Considering the sustainable situation of cultivated- land use,I build a system of 4 layers and 12 indexes.And I use AHP and Delphi method to determine the weights of indexes.To rule layer, the input intensity is the most influential aspects,followed by output-effect; To index layer,the labor input is the most influential aspects ,followed by fertilizer input.(3) From the spatio- temporal variation analysis of comprehensive factors, the level of the city's overall input-intensity was decreasing slowly, the levels of use degree and output-intensity all showed a increasing trend with fluctuation, the level of sustainable situation continued to decline year by year; The variability trends of urban and countries'output-effect are all the same,and the other comprehensive factors all have some regional differences; The comprehensive factors all have some spatial differences;The spatial variations of input-intensity,use degree and sustainable situation all changed little. The spatial variations of output-effect changed obviously.(4) The level of the whole city's cultivated-land intensive use was increased volatily as the trend of input-intensity, use degree and output-effect;The countries' cultivated-land intensive use changed all the same; The everage level of the whole city's cultivated-land intensive use was low,and the spatial variance of the intensive use is little, showing a trend of higher in south area and lower in north area;The level of cultivated land intensive use is divided into three levels: classâ… is highly intensive areas, including Wuzhi, Boai, Wenxian, Qinyang and Mengxian, classâ…¡is medium intensive areas including Xiuwu, classâ…¢is lowly intensive areas including urban;The spatial structure of the other regions' cultivated-land intensive use level all changed greatly beside Wuzhi and urban, the overal intensified cultivated-land use level of the first five years is higher than the last five years.(5) From the analysis of fieldwork in tipycal area of Jiaozuo,we can see the intensive degree in plain is the highest,followed by the hills,and the lowest is the beach.