柴达木盆地荒漠草地穴状补播牧草研究

在柴达木盆地的荒漠化草地上,选用5种牧草采用人工穴状补播的方法对草地进行了改良。补播当年,巴音河地区因风沙大,播后3天穴即被风沙填平,未成功。怀头他拉地区因降水满足不了补播牧草生长需要,幼苗全部枯死。泽令沟、德农地区牧草出苗较好。补播选用的5种牧草出苗都比较好,出苗率依次为:披碱草>沙蒿>红豆草>柠条>白刺,成苗率依次为沙蒿>白刺>柠条>披碱草>红豆草。根据试验结果,建议在风沙小,降水量在150 mm以上的地区推广人工穴状补播的方法。

Study on the oversowing in desert grassland in Tsaidam Basin by hole seeding

Five species were used to improve the desert grassland in Tsaidam Basin of Qinghai Province through oversowing by hole seeding technique at 5 sites.In Bayin River area,the sowed plants were burried within 3 days after sowing by the sand blown by wind in sowing year and died.In Huaitoutala,the sowed plants died because of drought.However,the seedlings grew well in Zelinggou and Denong.The oder of seeding rate of 5 species was Elymus nutans>Artemisia sphaerocephala>Onobrychis viciaefolia>Caragana korshinkii>Nitraria tangutica.The order of seedling surviving rate was Artemisia sphaerocephala>Nitraria tangutica>Caragana korshinkii>Elymus nutans>Onobrychis viciaefolia.Based on the experimental results,the precipitation in the oversowing area should be over 150 mm to ensure the success.