"京九"铁路绿色长廊北京大兴段绿化模式及结构配置

根据中国森林生态网络工程体系建设目的，结合北京大兴区自然条件及经济、社会状况，“京九”铁路绿色长廊北京大兴段拟建立由带（铁路、公路、河堤两侧的景观生态型防护林带）、网（农田防护林带、网）、点（城镇居民点绿化、公园、绿地、果园等）相结合的多树种、多林种、多层次和多功能的森林生态体系。在规划实施中，对国家级主要通道两侧各拓宽为200m,其中内侧30m宽为景观生态型永久绿化带，外侧170m宽为生态经济型产业绿化带。经过2、3a的建设，铁路两侧5km范围内的林木覆盖率现已提高到27％左右。选用乔、灌树种31种，其中包括高大乔木的防护树种，以景观为主的亚乔树种和花灌木，以经济效益兼防护的经济林木.

Afforestation Models and Their Structures of the Green Corridor Along Beijing - Jiulong Railway in Daxing District

The green corridor along Beijing - Jiulong railway in Daxing district will be composed of lines, webs and points ac-cording to the purposes of developing China Forestry Eco - Network System and the natural characteristics, economic and social situation, the so called line mainly means the forest shelterbelt along the road, railway and river embankment, the web mainly means the farm forest shelterweb, and point includes plant community in city and town, park and orchard. The main scheme that the afforestation models would be developed on both side of the national passageways was designed. The model included the eco - landscape and the economic - eco afforestation belts, respectively, which were constructed in the inner and outer of the corridors, and whose width was 30 m and 170 m. After 2-3 years'implement, the forest cover was about 27% and 31 tree species were employed in the green corridors.