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海棠山自然保护区为森林类型，主要保护油松栎类混交林的顶极群落、野生动物和医巫闾山北侧的独特景观。保护区区划面积３１５０ｈｍ２，有林面积２５３７ｈｍ２，其中有天然次生林１４７７ｈｍ２、人工林１０６０ｈｍ２。该区处于华北植物区系和蒙古植物区系的交汇处，东邻长白植物区系。植物种类繁多，共有８７科６３４种；动物资源丰富，有陆生脊椎动物２１目５３科１６２种。通过对核心区的封禁和科学管理，使天然次生林逐步恢复，为研究辽西森林生态演替规律提供天然实验区。
Begonia Mountain Nature Reserve is a forest type that mainly protects the climax community of the Pinus tabulaeformis and Quercus mongolica mixed forest as well as the unique landscape on the northern side of the Yiwulu Mountain. Protected area zoning area 3150hm2, forest area 2537hm2, of which natural secondary forest 1477hm2, plantation 1060hm2. The area is located in the North China flora and Mongolia Flora Department Interchange, east Changbai flora. A wide range of plants, a total of 87 families and 634 species; animal resources are abundant, there are 21 terrestrial vertebrates and 53 orders 162 species. Through the closure of the core area and scientific management, the natural secondary forest was gradually restored, providing a natural experimental area for studying the forest ecological succession in western Liaoning.