1·Vegetation is Laiyuan County of North China flora, the majority of existing vegetation for irrigation in the bushes, followed by natural secondary forest and plantation, forest coverage is 18.24%.
涞源县植被属华北植物区系，现有植被大部分为灌草丛，其次是天然次生林和人工林，森林覆盖率为18.24%。
2·The community in shrub forest owned both the characteristics of natural secondary forest and farmland, its dominant species were yellow mouse and squirrel too.
灌木疏林林地群落兼有天然次生林的啮齿动物群落和农田啮齿动物群落的特性，优势种为达乌尔黄鼠和松鼠类。
3·In this study, it takes reasonable measures to operate the natural secondary forest guide the operation of the various forest types and provide a theoretical basis for practical activities.
本研究为天然次生林采取合理的经营措施，指导各林分类型的经营实践活动提供理论依据。
4·Thus, the natural secondary forest in Taihang Mountain plays a very import role in maintaining the equilibrium of CO2 and O2, regulating climate, cleaning air and so on.
由此可见，太行山天然次生林在维持大气中O2和CO2平衡、调节气候、净化空气等方面起着相当重要的作用。
5·Under the similar site condition, the secondary forest and the mixed plantations had greater water conservation function and better maintenance of soil fertility than the pure stands did.
在相同的立地条件下，天然次生林和混交林具有更好的维持地力作用和更高的水源涵养功能。