Study on compound ecological models of orchard taking Grain amaranths as a link

The analysis on the biological and ecological characteristics of Grain amaranths illustrates that the ecosystem of orchard taking Grain amaranths as a link has higher efficiency of utilizing energy，can increase primary output and reduce the consumption of auxiliary energy．It can increase the knot of utilizing material during matter recycling and efficiency of material changing．The study also states three models of orchard taking Grain amaranths as a link and their characteristics on structure．