草地培育措施对重度退化亚高山草甸植被特征的影响

为研究草地培育措施对重度退化亚高山草甸植被群落结构特征的影响,分别以补播、施磷肥和划破草皮3个因素的不同组合方式对退化亚高山草甸、天然草地进行草地培育。结果表明:各草地培育措施对改善草地植被群落结构的效果不同。补播可提高补播草种所在群落的优势地位,划破草皮使良等牧草居于优势地位,施磷肥对草地植被群落结构影响不大,效果最差。补播+划破草皮改善优等牧草和良等牧草在草地植被结构中的效果比补播更显著,使优等牧草和良等牧草居于优势地位,补播+划破草皮的良等牧草优势地位与划破草皮相比有所降低。综合各项指标,补播+划破草皮+施磷肥的草地培育效果最优。

Effects of pasture improvements on the vegetation characters in heavy-degraded subalpine meadow

In order to study the pasture improvments on vegetation restoration in heavy-degraded subalpine meadow,the approaches of reseeding,using phosphate fertilizer,and cutting sod were applied in subalpine mead-ow in Lintan County,Gansu Province.The results showed that the effects of the pasture improvements on vege-tation restoration were different.Reseeding showed significant effect on community dominance of reseed grass. Cutting sod showed significant effect on community dominance of high quality forages.Phosphate fertilizer showed no significant effect on the vegetation community structure.The effects of cutting sod combined with re-seeding were higher than reseeding on community dominance of excellent and high quality forage,but were low-er than cutting sod on community dominance of high quality forage.Consideration of various indicators compre-hensively,reseeding combined with cutting sod and phosphate fertilizer application was the optimal approach.