【摘要】 根据天津市宝坻区的自然条件、区位优势和现有的农业种植结构,提出了稻藕轮作与稻鱼蟹混养相结合的高效生产模式并分析其生态优势。借助Ecopath软件,从系统可持续性和净产值角度,比较分析了稻鱼蟹混养与稻藕轮作相结合生产模式与稻田养鱼、稻田养蟹、稻鱼蟹混养、单一种稻4种稻田生产模式的优劣。结果表明:5种稻田生产模式F inn′s指数值从大到小依次为稻鱼蟹混养与稻藕轮作相结合、稻田养鱼、稻田养蟹、稻鱼蟹混养和单一种稻;稻鱼蟹混养与稻藕轮作相结合生产模式的可持续性指标优于其他3种生态种植模式,其净生产力、生物量/输出量、输出量/输入量和稳定性指标分别是单一种稻模式的2.63、4.25、2.03和3.56倍;与其他4种稻田生产模式相比,稻鱼蟹混养与稻藕轮作相结合模式的净产值很高,是适合于在北方推广的最优生态种植模式。更多还原

【Abstract】 A high-efficiency production model(Model A),combination of paddy-lotus rotation with fish/crab rearing in paddy fields,was put forward in light of the local physical conditions,regional advantages and the current agricultural farming structure of Baodi,Tianjin,and its ecological effects were analyzed.With the aid of Ecopath software,comparison in sustainability and net output value of the complex model with four simple models,rearing fish in paddy(Model B),rearing crabs in paddy(Model C),rearing fish and crabs in paddy(Model D),and just planting rice in paddy(Model E),was performed.Results show that in terms of Finn′s index,the five models were in the order of A>B>C>D>E;in terms of sustainability,Model A was superior to the other four,and in terms of net productivity,B/E ratio,O/I ratio and stability,it was 2.63,4.25,2.03 and 3.56 times as much as Model E,respectively.Compared with other four models,Model A is very high in net output value and thus put forth as an optimal ecological farming model for extrapolation in North(China).更多还原