草地农业应为宁夏南部山区农业生态系统中的主体

<正> 1.草地农业系统的特征草地农业系统是农业生态系统之一。它是在大农业的生产中,以草地为主体,结合农田和林地,把土地、植物和家畜联系起来,进行土地—植物—动物“三位一体”的农牧业产品的物质生产体系。草地农业的主要特点是:第一,突出了草的作用,特别是豆科牧草的作用。在草地农

GRASSLAND AGRICULTURE——MAINBODY OF AGRLCULTURAL ECOSYSTEM IN SEMIARID REGION OF NINGXIA

The semiarid region of Ningxia is referred to the mountainous district in Ningxia,which originally was grassland ecosystem. However, most of the area is reclaimed intofarmland now, and over 90 per cent of the arable land has been used for crop planting, so itis a typical grain ecosystem. Imperfect structure, poor function and deteriorative ecologicalenvironment are disadvantages of the system. During 1986-1990, the grassland agricultural ecosystem of soil, plant and livestockhad been established in Sidunzi Village of Yanchi County, in the north of loess plateau. Inthis area, the proportion of animal husbandry output value in the total agricultural outputvalue increased to 31% from 22%; the proportion of organic energy in the supplementaryenergy invested in farmland increased by as much as 71.48%; the total grain yields in-creased from 0.75 million Kg to 1 million Kg. It is proved that the major approach to pro-mote the agricultural production and animal nusbandry, and to extricate farmers from pov-erty is to establish the ecosystem of grassland agriculture.