甘肃省靖远县草地资源及提高草地生产力的途径

The Natural Grassland Resource and Way to Raise Grassland Productivity of Jinyuan County, Gansu Province

甘肃省靖远县天然草地面积３７．３３万ｈｍ２，占农业用地的６４．３％。草地可以分为高寒草甸类、温性草原类、温性荒漠草原类和温性荒漠类４大类。有天然牧草４２科，１３８属，２１５种，主要是禾本科、菊科、豆科、藜科、莎草科和蔷薇科的种。青草总产量５．１５亿ｋｇ，理论载畜量２４．７万羊单位。

The natural grassland in Jinyuan County, with 373 300hm2 in area which covers 64 3% of the area of the agricultural land. The grassland can be divided into the 4 types, they are alpine meadow, temperate steppe, temperate desert steppe and temperate desert. There are 42 families, 138 genus and 215 species of the grassland plants, composed mainly of the Gramineae, Compositae, Leguminosae, Chenopodiaceae, Cyperaceae and Rosacea. There are 5 15 billion t fresh forage in a year can be produced and the theoretical grazing capacity is 247 000 sheep unit. The problem of grassland management and the ways to raise productivity of the grassland are discussed.