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应用模拟试验的方法，研究了“草基-鱼塘”系统中的能量转化与养分循环．结果 表明，该系统中饲草对太阳能的利用率为 ０． ８３％，鱼对饲料能的转化率为 ７． ３％．与以粮 食作为鱼饲料比较，单位面积草地的产鱼当量是粮食作物的１．６倍．鱼对饲料Ｎ、Ｐ、Ｋ的 转化率分别为１６．８％、３２．３％和２．０％．塘泥沉积的Ｎ、Ｐ分别占饲料的２３．４％和５６．１％； 猪对饲料 Ｎ、 Ｐ、 Ｋ的转化率分别为 ２０． ５％、 ３３． ７％和 ４． ６％，猪粪尿回收饲料 Ｎ为 ３６． ４％、 Ｐ为 ６３． ８％、 Ｋ为 ３９． ４％．猪-草-鱼结合的基塘系统其能量和养分转化效率均高于单一的 养鱼系统．
Using the method of simulation experiment, the energy conversion and nutrient cycling in “grass-fish pond” system were studied. The results show that the system of forage grass on solar energy utilization rate of 0. 83%, fish feed conversion rate of 7. 3%. Compared with grain as a feed for fish, the fish yield per unit area of grassland is 1.6 times that of food crops. The conversion rates of fish to feed N, P and K were 16.8%, 32.3% and 2.0% respectively. Pond sediment N and P accounted for 23.4% and 56.1% of the feed, respectively. The conversion rates of feed to N, P and K were 20 and 20, respectively. 5%, 33. 7% and 4. 6%, pig urine excreted feed N 36. 4%, P is 63. 8%, K is 39. 4%. The pig-grass-fish combined basal system has higher energy and nutrient conversion efficiency than a single fish-farming system.