关键词: 草原改良, 松土, 补播, 浅耕翻

Abstract: The project of comprehensive set techniques for improvement in arid and semiarid grasslandof Inner Mongolia,Jilin and Shaanxi province was carried out by the grassland improvement group during1972~1989.The main principle for grassland improvement in arid and semiarid region is making every efforts to conserve precipitation and simultaneously make it stored in the soil.The results of those experiments are showing as follow:The first is that shallow tillage may be used in meadow grassland which isdominated by rhizome grasses, such as Leymus chinensis; The second is that interseeding in steppe which isdominated by tussock grasses,such as Stipa spp.; The third is interseeding that interseeding in abandonedfield with loess earth of which the vegetation cover must be less than 10%- The species which were used byinterseeding was different in different type steppe, such as Leymus chinensis be usually used in meadowgrassland in the northeast part of China, Russian wildrye and Medicago saliva are used in tussock grassland which the precipitation should be more than 250mm.Astragulus adsurgens.Hedysarum mongolicum.Caragana microphylla、C-intermedia commonly be used in loess plateau for interseeding.The machineswhich we used for interseeding called 9SSB-1.75 type interseeder and 9SF- 2.95 type interseeder.thesetwo types interseeder were designed and produced by GRI-Recently the area of improved grassland were155 thousand hectares.The productivity of improved pasture increase by 40% to 100% or more,especlallyby interseeding,maybe increased by 2 to 7 times compared with the un-jmproved grassland.Whether youget success in grassland improvement, it not only depends on the science and techniques,but also dependson the comprehensive skiIls integrated with climate, soil and vegetation type, especially the time and aamount of rainfall in a year.

Key words: Rangeland improvement, Loosening, Interseeding, Shallow plowing