【摘要】 <正> 我国的草原畜牧业生产对国家的社会主义建设作出了很大贡献。但是,近年来,由于滥垦乱伐,造成草场退化、沙化和碱化,毒草害草增加,使畜草矛盾加剧,严重地阻碍了畜牧业生产的发展。因此,从草原生态学的观点出发,分析草原生态环境因素的特更多还原

【Abstract】 An experiment work on the improvement of natural grassland was carried out through 1972-1978 by shallow ploughing, with a common plough, the grassland dominated by stipa grandis and Aneurolepidium Chinense under a dry climatic condition with an annual mean rainfall only 9.7 inches.The ecological habitat of the natural grassland had shown a great change after ploughing, the soil became lossened and the water content as well as the soil temperature and its aeration conditions got improved. The new habitat seemed very suitable for the growth and development of the rootpropagated Aneurolepidium Chinense. Hence, the succession of vegetation had happened on the secondary bare area. According to the authors’ observation, it could be divided into four stages: the annual-biennial forb stage, the rhizome herbage stage, the tussock herbage stage and the little semi frutex stage. Through the studies of the succession order of the vegetation, the authors held that the rhizome herbage stage with Aneurolepidium Chinense as the constructive species had a good usability value. During this period, the hay output on the ploughed grassland increased 37.9-82.1% as compared with those on the unploughed. The higher forage production would be able to continue tea years long, but if overgrazed(or mowed), it would be deteriorated into the little semi-frutex stage. In order to prolong the utilization years of the rhizome herbage stage, an effective measurement must be taken to prevent it from deterioration.更多还原