稻田养蟹模式的生态经济分析

Ecological economic analysis of a rice-crab model.

在野外调查和实验数据分析的基础上 ,运用生态经济学原理研究了稻田养蟹模式的结构与功能、物流能流特征及其经济效益与生态环境效益 .结果表明 ,与单一稻作模式相比 ,稻田养蟹模式的综合效益较高 .从经济效益看 ,后者的土地纯收入、成本收益率和劳动生产率比前者分别增加 382 %、6 7.7%和2 95 % .从生态环境效益看 ,养蟹一年后 ,土壤中的TN、碱解N、TP、速效P、速效K和有机质分别增加10 .6、3.3、5 .8、11.7、3.5和 10 .5 % ,且每年可削减非点源N污染负荷 6 .375kg·hm-2 .

Based on field investigation and experimental data analysis,ecological economic principles were applied to study the structure and function,the characteristics of material and energy flows,and the economic and ecological benefits of a rice crab model.The resutls show that rice crab model had a higher integral benifit than rice model,and its net income,cost benefit ratio,and labor productivity were increased by 382%,67.7% and 295%,respectively.In view of the ecological benefits produced,the total nitrogen,alkaline hydrolyzal nitrogen,total phosphorus,rapidly availlable phosphorus,rapidly available potassium,and organic matter in the soil after 1 year carb breeding were increased by 10.6%, 3.3 %,5.8%,11.7%,3.5% and 10.5%,respectively.Moreover,6 375 kg N·hm -2 of non point source pollution load could be cut down annually.