Study on the Optimum Structure of Agroforestry

The results show that:(1) Price fluctuation of agriculture and forest products should be considered in planing the optimum use of land.(2) The appropriate species in agroforestry system are pear,rape and cotton. (3) The appropriate structure are two pear hybrids (Pyrusbretschneideri Rehd) intercropping model with a spacing of 3 m×5 m. Forest belts are composed of two or three rows of trees and the distance between belts is 30 m.(4)The optimum compound of crop species in fruits-crops model is wheat-vegetable.The rate of output value to invested capital is 2.7:1. Other compounds of crop species are wheat-yam ,wheat-corn,wheat-millet,wheat-beanand, rape-corn etc.