高寒地区退化草地改良试验研究

高寒草地是我国重要的草地资源,素有“高原肉库”之美称,但由于近年来草地利用不合理,家畜载为量过大,草地出现不程度退化,为改善草地植物生存条件,对退化草地进行了改良试验研究,结果表明,３种改良措施可改善草地生境,增加土壤速效养分,施肥改良效果最佳,增加牧草在草群中所占比重,禾本科,豆科和莎草科牧划分别对对照区增加９．０２％～１０．１７％,１８．４０％～２７．７６％和－６．５７％～１．８７％,可食３９

Experimental Study of Improvement Measures on the Depredated Grassland in Alpine Areas

The alpine grassland is one of the important grassland resources in our country and well known for the meat production. However, the grassland degradation occurred, to a different degrees, due to the irrational utilization in the recent years. An experimental study was therefore conducted to improve the habitat of herbage and three measures have been tested, e.g., fertilizing, fencing and meadow cutting.The results indicate that the available nutrients in the soil, to a different degree, has increased by the three measures. Fertilizing measure has a significant improving effect on the grassland: the proportion of grass, legumes and nutgrass in the community increase by 9.02% - 10.17% , 18.40% - 27.76% and 6.57% - 1.87% respectively and the yield of edible herbage increases by nearly 100% . Fencing measure takes second place: grass and legumes increase by 26.81% - 39.85% and 20.74% - 37.85% , nutgrass decrease by 11.85% - 19.23% , the yield of edible herbage increases by nearly 100% . The meadow cutting measure has a less improving effect on the grassland: grass and legumes increase by 18.17% - 23.86% and 19.85% - 48.10% respectively, nutgrass decrease by 4.70% - 8.92% , the yield of edible herbage increases 34.3% - 89.7% . It concludes that fertilizing and fencing are effective approaches for improving degraded grassland.