关于小兴安岭东段沼泽形成问题

冷湿的气候和岛状多年冻土，以及低缓的地貌是本区沼泽形成的主要因素。沼泽形成的时代新，发育阶段全，类型复杂。上游形成时间较早，始于中全新世前期，中、下游形成时间较晚，始于晚全新世。中全新世为沼泽化和沼泽形成时期，晚全新世为沼泽扩展 时期，至今仍发育有富营养沼泽、中营养沼泽和贫营养沼泽。

The Problem on the Bog Formation in the Eastern Part of Xiao Hinggan Mountains

The cold-wet climate, and the island-shape permafrost as well as the low-gentle geomorphy are the determination factors of bog formation in this area.The bog in the area formed late, each developing stage has been occurring and its types are complex.The bog in upper stream formed early, and had begun in early Middle Holocene; The bog in middle or lower stream formed late, and had begun in late Holocene. Middle Holocene was the boginess and bog formation period; Late Holocene was the period in which the bog formed extensively and developed. Up to now, there have being developed polytrophic middletrophic, and oligotrophic bog in this area.