山地草原化草甸草地放牧演替的研究

STUDY-ON GRAZING SUCCESSION IN MOUNTAINOUS PASTURELAND-MEADOW

用极点排序法对草原化草甸草地不同放牧演替阶段进行了测定。结果表明:围栏内轻度利用下的草地群落较为稳定,演替度最高(328.29),中度利用的围栏内草地可食牧草量所占比重最大(0.68);重度利用下的围栏外草地处于逆行演替(退化演替)之中.

The grazing succession of three stages in pastureland-meadow were determined by means of the polar ordination.The results were as follows, the grassland plant community was much stable under the condition of light grazing,the degree of successions(DS)was higher than others,and the value of DS was 328.29;the intaking herbages ratio in grassland under moderate grazing was the hightest and the value was 0.68;the grassland under heavy grazing was in deteriorate succession.