ABSTRACT
According to surface modeling results of the carrying capacity of terrestrial ecosystems in China (Yue et al., 2008), the maximum amounts of calories, protein, and fat which could be produced by farmland ecosystems are 4,155,620,000 million kcal, 116,643 million kg, and 36,246 million kg, respectively. Grassland ecosystems in China could produce 17,970 million kg of mutton, which amounts to 43,320,000 million kcal of calories, 2139 million kg of protein and 3793 million kg of fat. Woodland ecosystems could provide 229,780,000 million kcal of calories, 4299 million kg of protein, and 8200 million kg of fat. Aquatic ecosystems in China could supply 50,930,000 million kcal of calories, 7255 million kg of protein, and 2200 million kg of fat. In view of the threshold of carrying capacity (Yue, 2000), 78.9% of the food produced by ecosystems could be used for human demand. A 11% production drop has been caused by natural disasters according to statistical analysis. Thus, 3,101,800,000 million kcal of calories, 90,247 million kg of protein, and 34,925 million kg of fat would be available for human consumption.
