With the methods of regression analysis and trend surface analysis, taking the bottom and top lines of dark conifer forest, bottom line of permafrost and the snowline of the latest glaciation in China
China has a land area of 9.6 million km2, 65% of the total land area of the world. Only 14.2% is cultivated at present, 0.5% is under fruit trees, 34.8% is in grazing. 17.2% is under forests, 2.6% is
Since 1949, great changes have taken place in the amount and distribution of Chinas urban population. From the analysis on the change in total urban population, it can be learnt that urbanization prog
There widely occur stretches of permafrost at more than 3,800-4,200 meters above sea level in the source area of the Huanghe (Yellow) River. The periglacial geomorphology develops quite well, includin