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东北过去是个林海。解放前,仅仅五十多年的时间内,就使得曾复盖自海岸至松花江沿岸的广大地区的原始森林,遭到严重破坏,一变而为现在的次生林。 帽几山的森林属长白山支脈张广才岭的一部分。地形由中、低山逐渐转入丘陵。由帽几山往北,越过黑龙宫以北的大青山主峯(海拔1020米),即为松花江所阻隔与小兴安岭分开,往西南逐渐过渡到东北大平原,东西以张广才岭主峯为屏障。从植物成份上,属于满洲区系的长白山亚区,为东北东部山地针阔混交林省的一部份。长白山的一些特有种到此即不再北进。从垂直带来看,帽几山森林均位于阔叶红松林带内,但现在已形成次生林。不其演变的历史大致可分为以下三个时期:
Northeast past is a forest. Before the liberation, in just over 50 years, the original forests that had been covered from the coast to the vast area along the Songhua River had been seriously damaged and changed to the present secondary forest. Caps mountains of the forest is Changbai Mountain Branch Zhang Guangcai Ridge part. The terrain by the middle and low mountains gradually transferred to the hills. From Cap Hill to the north, across the main peak of Daqing Mountain (1020 meters above sea level) north of the Black Dragon Palace, it is separated from the Xiaoxing’an Mountains by the Songhua River and gradually transited to the northeast plains through the southwest. From the east to the main peak of Zhangguangcailing . From the plant composition, belonging to Manchuria Changbai Mountain Asia, as part of the mountainous eastern coniferous and broad-leaved forest province. Some endemic species in Changbaishan no longer go north. Seen from the vertical, cap mountain forest are located in the broad-leaved Korean pine forest belt, but now has formed a secondary forest. The history of its evolution can not be divided into the following three periods: