自然概况约20,000年前,由于受到第四或第五冰川期影响,森林群落发生逆演替,林木在中欧消失了。到了约12,000年前,发生了顺演替,但回迁的林木已不足40种。冰川的向南推进和欧洲山脉以东西走向为主两个因素之结合,引起大量冰川前植物的灭绝。幸存下来的仅有云杉、冷杉、山毛榉、落叶松和桉树各一种,松树、栎树、桦树和椴树各两种,枫树和桤木属 About 20,000 years ago, due to the effects of the fourth or fifth glacial period, the forest communities were reversed succession, and the forest trees disappeared in Central Europe. By about 12,000 years ago, Shunyishitang had taken place, but fewer than 40 species of trees had been returned. The combination of the southward advance of the glacier and the east-west orientation of the European mountains has led to the extinction of a large number of pre-glacial plants. Only surviving spruce, fir, beech, larch and eucalyptus each one, pine, oak, birch and linden two, maple and alder