RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (6): 754-754.

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ANALYSIS ON SPATIAL TEMPORAL DIFFERENCE IN ECOLOGICAL SECURITY OF CULTIVATED LAND RESOURCES IN CHINA

ZHU Hongbo, ZHANG Anlu   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-20

Abstract:

Based on the analysis of connotation,characters and factors influencing ecological security of cultivated land resources,the paper sets up indexes for assessing the security.Through the analysis of changes in ecological security of cultivated land resources,it is found that the level of security arose initially and then declined since the introduction of reforming policy,with the composition value increased from 0.891 8 in 1981 to 0.941 0 in 1990,and then decreased to 0.639 0 in 2004.From the view of security level in different provinces in 2004,the difference between provinces is very obvious,and the security level of developed provinces is higher than that of developing provinces.The factors influencing the security are farmer per captia net income and fund of agricultural support etc at the beginning of the reforming policy introduction.Some other factors may have direct and/or indirect influence,such as pesticides and ratio of nitrogenous fertilizer.The application of pesticides,ratio of nitrogenous fertilizer,farmer per captia net income and consciousness of ecological security are main factors of obstacles in different provinces.The factors in developed provinces are those with direct and/or indirect influence,and the factors in developing provinces with social and economic influence.It is proposed that the constitution of protective laws and regional policies may improve the ecological security of cultivated land resources.

Key words: cultivated land resource, ecological security, influence factor, assessment index, spatialtemporal difference

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