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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。
The biological selection criteria of four design agricultural-grazing-fishery combination systems are recommended, that is to say, the combined organisms are mutually beneficial in utilization of resources, coordinate and complement each other in their ecological functions, exert their respective strengths in maintaining the characteristics of the combined system, On the integrity of large agriculture. Also put forward a combined system of evaluation indicators for scientific prediction combined with system yield potential to provide a theoretical basis. The screening of rice - duck - fish, fish - duck - pig - grass and fish - duck - pigs and other models have a better overall efficiency. The duck can play an all-round role in promoting the binding system and is a long-term defense guardian of rice. It is also a biological factor that increases the amount of dissolved oxygen and increases the overall economic benefits.