鸭在农—牧—渔结合系统中的作用

Duck's Function in Agronomy—animal hus—bandry—fishery Integrated System

推荐了4条设计农—牧—渔结合系统的生物选择标准,即被结合生物在资源利用上互惠共生,在生态功能上协调互补,在维持结合系统特性上都能发挥所长,在群体结构上展现大农业的完整性。还提出一项结合系统的评估指标,为科学预测结合系统增产潜力提供理论依据。所筛选的稻—鸭—鱼、鱼—鸭—猪—草和鱼—鸭—猪等模式具有较好的综合效益。鸭对结合系统能发挥全面促进作用,是水稻长效生防卫士,也是增加溶氧量,提高整体经济效益的生物因素。

Four standards for selecting organisms were recommended to design agronomy-ani- mal husbandry-fishery integrated system,i.e.integrated organisms were mutualism in using resources,were cooperative and complementary in ecological function,could give full play to the superiority of each kind of organisms in maintaining trait of the system, and could display character of complete agriculture in the whole structure.One index for integrated system estimation was also presented.All standards above provided theoretical basis for forecasting the potential of increasing yield of integrated system.Selected inte- grated models rice-duck-fish,fish-duck-pig-weed and fish-duck-pig have bet- ter comprehensive benefit.Duck could promote the integrated system in all-round way, it is bodyguard of rice in long-time biological control,the biological factor of increasing dissolved oxygen and of improving economic benefit in the entirety.