白城子村果、草、鱼系统生产效果的研究

A STUDY ON ORCHARD, FORAGE AND FISHERY PRODUCTIONSYSTEM IN BAICHENGZI VILLAGE

为改善农村的环境和经济状况，利用白城子村５．７ｈｍ２幼龄苹果园和已建的４ｈｍ２鱼池对果树－牧草－养鱼系统的生产效果进行了研究。通过３年试验，证实了果树地种苜蓿，一方面可减少水分的蒸发，促进果树根系对水肥的吸收、转化、利用；另一方面苜蓿有良好的肥田作用，可增加肥源，促进果树生长，而生产的苜蓿用于养鱼，大大降低了饲料成本，每公顷水面可获纯利润１１６１０元。因此，利用果树地种植苜蓿，苜蓿喂鱼相互配合，是充分利用国土资源、发挥生物生产潜力的一种综合生产模式。

o improve the environmental and economic conditions, 5.7 hm2 orchard of yang apple trees and 4 hm2 fish pool in Baichengzi village were used to study the production efficiency of the orchard-forage-fishery system. Through 3 years’ experiment, if was proved that alfalfa planting under fruit trees could reduce evapouration, improve moisture and fertilizer uptake, transfer and use of fruit trees through root system, moreover, alfalfa had the good effect of fertilizing the soil, thus increasing fertilizer sources and enhancing growth of fruit trees. Alfalfa as fish feed could also reduce feed cost greatly, providing net profit 11 610 yuan/hm2. Thus, alfalfa planting under fruit trees combined with fish production using alfalfa as feed was a good integrated model for better land use and release of biological potential.