Function and Profit of Citrus-Forage Grass-Freshwater Fish-Duck Developing Model in Hilly-Gully Area

By the principle of ecology,the citrus-forage grass-freshwater fish-duck developing model was established based on the resource and environmental condition of suburban hilly-gully area. The function and profit of the model in hilly resource exploitation and ecologic environment protection were discussed by the data of location observation. The results showed the model could increase the cover-degree of young orchard,improve climatic condition within the orchard in summer,raise soil nutrient content,aeration,water penetration and conservation obviously. Water and soil loss in the orchard was much weakened. This model could also promote the circulation of material and energy within the ecosystem,increase the utilization ratio of natural resources and reduce the use of fertilizer in the system.The output value and profit per hectare in the experimental area were notably increased.By using this model,marked economic,social and ecologic profits could be achieved.