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地球上绿色植物每年通过光合作用合成的有机化合物中仅碳素就有2×10~(11)吨,但其中大多数是高等动物不能直接利用的粗纤维素(包括木质素和半纤维素)。据估计,全世界每年可产生粗纤维72×10~(10)吨。我国每年的产量是11451×10~6吨。其中农业下脚料和废物525×10~6
The organic compounds on the Earth’s photosynthesis by the greenery each year have only 2 × 10-11 tons of carbon, but most of them are crude cellulose (including lignin and hemicellulose) that can not be directly used by higher animals. . It is estimated that the world can produce 72 × 10 ~ (10) tons of crude fiber per year. China’s annual output is 11,451 × 10 ~ 6 tons. One agricultural waste and waste 525 × 10 ~ 6