Succession to a climax can be held at any stage by human intervention, such as grazing on chalk downland.

人为干扰可以阻止演进行，例如渡放牧。

Abstract: Serai process of vegetation on the sand of Zhanggutai in Liaoning province is from moving dune.

辽宁省章古台沙地被演，从流动沙丘开始。

Its compositional ichthyofauna differs from its consecuting fiver systems,and has momentous significance on succession of fishes and ichthyofauna dividatur in watershed of North China.

在类区系组成上，它与相邻水域有着很大差异，在我国北方水域类演和区系划分上有着重要意义。

Halosere A plant community in a succession that starts on land periodically inundated by the sea. Haloseres include salt-and flooding-tolerant pioneer communities on mudflats and saltmarshes.

是一种在周期性被海水淹没陆地上进行演群落。它包括那些在泥滩和盐沼上生活耐盐耐淹先锋群落。

Hippophae rhamnoides L.subsp.sinensis is a heliophyte tree,so that some scholars consider it as a pioneer population,but others regard that the tree regenerate well in natural conditions.

中国沙棘属于阳性树种,因此有些学者将其视为群落演中先锋种群,而有些学者研究表明它在自然状态下更新良好。