Their order of net income is the early fruit orchard intercrop-ping>fruit tree-grain crop intercropping>agro-forestry intercropping>forest belts farmland>forest-animal husbandry combinational system.

• 而产投比为果园早期间作<林农间作<果农间作<林网农田<林牧结合；为平原农区合理建立农林复合生态系统提供了科学依据。