自从人们明确了绿色植物的构成物质中有90—95％来自光合作用这一事实以后,不少学者从光能利用的角度对一些作物的生产潜力进行了估算。德国著名科学家Liebig(1840)首次进行了这种估算。他假定地球表面全部由密集生长的草地所复盖,获得了全球陆地每年同化碳素为 Since it has been clarified that 90-95% of the green plant matter comes from photosynthesis, many scholars have estimated the potential of some crops from the perspective of light energy use. Liebig (1840), a famous German scientist, made such an estimation for the first time. He assumed that the Earth’s surface was covered entirely by densely-growing grasslands and that annual global assimilation of carbon was