贵州省长江流域天然林分区和主要树种结构

The Natural Forest Division and Sketch Species of Changjiang River Watershed in Guizhou Province

针对贵州省长江流域现有森林和植被分区中存在的问题 ,通过综述国内外森林和植被区划的成果 ,提出了天然林资源相应的分区原则和依据 ,并将省内长江流域天然林划分成 2类森林区 7类森林亚区 12类森林小区 ,用于指导工程区内现有森林资源的保护、退耕还林、封山育林、飞播造林和人工造林等。最后讨论了省级分区、国家分区和县级分区的尺度对接 。

The research result of this title is used for the natural forest conservation project of Changjiang river watershed in Guizhou province.In order to settle existing division problems in the project,the new dividing rules are set as fellow after systematically analyzing materials at home and abroad of forest、vegetation、site、etc.The study results are 12 forest types 7 forest sub_zones 2 forest zones had been divided and sketch species in different forest types are expressed. The natural、secondary and planting forest distribution regularity is foundation of the forest division. High units,linking up to national forest zone 'the subtropical evergreen broadleaf forest zone',respond to zonal water and heat changes; low units, linking down to county forest division, respond to changes of rock、geology、 landform、valley、 etc. The principle of basic forest types applies to the influence of latitude、 longitude、 elevation on forest. For example, the forest types of Fanjin and Leigong mountain are the basic forest type as subtropical moist evergreen broadleaf forest zone. Main branches of the river, as unit for ecological environment rebuilding and natural forest protecting, are very important factors in the division. Middle division units mainly use the quantity analysis by water、 heat、forest type; Low division units mainly use the quality analysis by sectors of branches. The division area is spatial continue and complete. The forest division types limits are decided by division results of vegetation、forest、geology、landform and county administration. A three_grade system is adopted for the division.