Abstract: Based on the calculation of actual yield per unit area in 2002,this paper analyzed the ecological footprint and its composition of each province in China.The results showed that there was a significant difference in the ecological footprint and its composition among different provinces,e.g.,cropland changed from 0.078 hm²·cap^-1 in Shaanxi to 0.126 hm²·cap^-1 in Beijing,grazing land changed from 0.020 hm²·cap^-1 in Jiangxi to 0.372 hm²·cap^-1 in Xizang,forestland changed from 0.020 hm²·cap^-1 in Guizhou to 0.209 hm²·cap^-1 in Beijing,fishery area changed from 0.001 hm·cap^-1 in Xizang to 0.011 hm²·cap^-1 in Shanghai,built-up area changed from 0.013 hm²·cap^-1 in Guizhou to 0.045 hm²·cap^-1 in Neimenggu,and fossil energy changed from 0.251 hm²·cap^-1 in Guangxi to 2.854 hm²·cap^-1 in Shanxi.The eastern and southern provinces were mostly in a state of ecological deficit,while the western and northern provinces were mostly in a state of ecological remainder.As for the relationships among ecological footprint,economic development and technological progress,great difference existed in different provinces,e.g.,the ecological footprint was about 1 hm²·cap^-1 in Fujian,Henan,Sichuan,Anhui,Yunnan,Shaanxi and Guizhou,while the GDP per capita changed from 1.35×10⁴ yuan in Fujian to 0.3×10⁴ yuan in Guizhou,and the ecological footprint per 1×10⁴ yuan GDP changed from 0.74 hm² in Fujian to 3.51 hm² in Guizhou.Therefore,to resolve the conflicts between the shortage of natural resources and the economic development of China,emphasis should be put on the provinces with big ecological footprint per capita,low GDP per capita,and high ecological footprint per 1×10⁴ yuan GDP.In these provinces,economic growth mode and industrial structure should be changed,dependence of economy on natural resources should be decreased,use efficiency and economic output of natural resources should be improved,and ecological,resources and economic sustainability should be realized.

Key words: chemical method, atmospheric aerosol., ammonium nitrogen isotope ratio, PM_2.5