自然生产力就其实质而言是自然的生态生产力。它包括两个层次:一是自然界的自然力,即生态自然界客观存在的一切物质力量和因素;二是自然界的生产力,即生态自然界客观存 Natural productivity is, in its essence, a natural ecological productivity. It consists of two levels: one is the natural forces of nature, that is, all the material forces and factors that exist objectively in the ecological and natural world; the second is the productivity of nature, that is, the objective existence of ecological and natural world