5.Succession to a climax can be held at any stage by human intervention, such as grazing on chalk downland.
人为的干扰可以阻止演替的进行,例如过渡的放牧。
6.Whether the selection of grassland grazing systems is reasonable has direct influences on sustainable utilization of grassland resources, bioenvironmental quality on grassland and herdmen's income.
草地放牧制度选择的合理与否,直接影响草地资源的可持续利用和草地生态环境质量以及牧户经营收。
7.Where aridity, degeneration or soil erosion occurs as a result of overgrazing, users of the grasslands shall be required to reduce grazing and resow forage grass so as to restore vegetation.