东北重点国有林区天然林生态区划

Ecoregion division of natural forest at the key state-owned forest region in Northeast China

东北重点国有林区是构建"两屏三带"为主体生态安全战略格局的重要组成部分,为了对该区域天然林资源保护工程(简称"天保工程")的生态效益进行全面、系统和科学地定量化评估,对东北重点国有林区天然林的生态区划是不可或缺的。结合天保工程实施范围、中国生态地理区域系统、中国植被、中国土壤侵蚀区划以及中国行政区划,应用地理信息系统空间分析,区划出东北重点国有林区天保工程生态区。分别选取水热条件、植被类型、土壤侵蚀类型及强度作为3个级别的区划指标,一级区域3个,二级区域4个,三级区域12个。基于能够表征其特性的多重指标,对东北重点国有林区天保工程范围进行区划,直观地反映该区域的实际地理分域规律,用分区特征来印证生态效益的评估结果,为其生态效益监测与评估奠定基础。

[Background] The key state-owned forest region in Northeast China is one of ＂Two Screen and Three Zones ＂ as the subject, to ensure the ecological safety of the Northeast China. For comprehensively,systematically,scientifically,and quantitatively evaluating the ecological benefits of the region＇s Natural Forest Protection,dividing the ecoregions is indispensable. [Method]First,we chosen the map of the Natural Forest Protection, eco-geological system of China, Chinese vegetation regionalization,China＇s soil erosion region and China＇s administrative division as the data sources. Then,we selected hydrothermal conditions,vegetation types,soil erosion types and intensities as three levels of regionalization indicators. Finally,we applied the geographic information system（ GIS） space analysis to obtain the ecoregions. [Results] Based on the climate there are 3 Class I areas of cool moist,midtemperate moist,and mid-temperate semi-moist. Based on the Class I and vegetation type,there are 4 Class II areas： cool moist coniferous forest,mid-temperate moist mixed broadleaf-conifer forest,midtemperate moist rangeland,and mid-temperate semi-moist rangeland. Based on the Class II and soil erosion type and intensity,there are 12 Class III areas： Ⅰ-A-a-1 cool moist deciduous conifers nonerosive area,Ⅰ-A-a-2 cool moist deciduous coniferous slight wind erosive area,Ⅰ-A-a-6 cool moist deciduous coniferous high water erosive area,Ⅱ-A-b-1 mid-temperate moist mixed broadleaf-conifer forest non-erosive area,Ⅱ-A-b-3 mid-temperate moist mixed broadleaf-conifer forest slight water erosive area,Ⅱ-A-b-4 mid-temperate moist mixed broadleaf-conifer forest mild water erosive area,Ⅱ-A-b-5 mid-temperate moist mixed broadleaf-conifer forest moderate water erosive area,Ⅱ-A-b-6 mid-temperate moist mixed broadleaf-conifer forest high water erosive area,Ⅱ-A-c-6 mid-temperate moist rangeland high water erosive area,Ⅱ-B-c-1 mid-temperate semi-moist rangeland non-erosive area,Ⅱ-B-c-2 midtemperate semi-moist rangeland slight wind erosive area, and Ⅱ-B-c-3 mid-temperate semi-moist rangeland slight water erosive area[Conclusions]Based on multiple indicators,the key state-owned forest region Natural Forest Protection in Northeast China is characterized,ecoregions intuitively reflects the actual geographical regional rules. Meanwhile,we may use regionalization characteristics to verify the results of ecological benefit assessment, thus this work lays the foundation for ecological benefits monitoring and evaluation of the region＇s Natural Forest Protection.