宁夏固原云雾山草原自然保护区草地改良研究

PASTURE IMPROVEMENT EXPERIMENT REPORT IN YUNWU MOUNTAINS NATURE CONSERVATION ZONE,GUYUAN COUNTY,NINXIA PROVINCE

The climate of loess hilly has the charater of drought and short free-frostperiod.The gentle slope where exists mass degrade pastuer,by choicing and using such excellent legume perennial grass as Astragulus adsurgens and Onobrychis viciaeqolia which have the strong adaption and high grass yield,combining with the tillage,can show the distinct improvement effect.The average fresh grass yield(per year,mu)of Astragalus adsurgens during four years in the improving pasture is 960.4-1082.7Kg,which is the 12 times than the pasture yield before improvement;The average fresh grass yield(per year,mu)of Onobrychis viciaeqolia during threeyears is 1198.7 Kg,15 times than the yield improvement.The improved pasture has obvious economy benefit and ecology ben- efit.