The famous poem "Wildfire starts a prairie fire and the spring breeze blows high" illustrates the infinite development of grassland, a natural ecosystem.

First of all, you have to understand the definition of the two. Agro-ecosystem is an agricultural production system with various forms and different levels of development established by human beings in a certain period of time and in a certain region, using the relationship between agricultural biological and abiotic environments and biological populations. Natural ecosystem is a relatively stable ecosystem maintained by natural adjustment ability in a certain time and space. So you understand?