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川藏公路拉萨至八一段公路绿化模式研究试验区贯穿拉萨河谷半干旱区至藏东南半湿润区 ,海拔自西段 3 60 0m到东段 3 0 0 0m ,穿越了 4 90 0m的高寒地区 ,自然条件极为特殊。本研究进行了 6种乔、灌、草立体模式的配置。在试验区内 ,公路绿化树种胸径生长的速度表现为白柳 >藏川杨 >高山松 >北京杨 ,它与立地的水分条件有关 ,而与头木作业强度无关。试验结果表明 ,除杨柳树外 ,红叶碧桃、光核桃、沙棘、柠条、刺槐等树种对干寒环境有较强的适应能力。冬春季节干旱、夏秋季节洼涝是确保植树成活的最大障碍。文中还比较了建模式与传统植树方式在措施上的差异 ,初步分析了公路绿化模式研究的生态环境保护目的以及模式与生态环境的关系
The study area of Lhasa-81 section of Sichuan-Tibet highway greening model runs through the semi-arid area of Lhasa valley to the southeast of Tibet, with elevation from 3 60 0m to 3 0 0 m in the east and 4 90 0m alpine area , Natural conditions are very special. This study carried out six kinds of Joe, irrigation, grass three-dimensional configuration mode. In the experimental area, the speed of diameter growth of road afforestation species was white willow> Tibetan poplar> alpine pine> Beijing poplar, which was related to the water condition of the site and had nothing to do with the work intensity of the head wood. The results showed that, in addition to the willow tree, the leaves of red leaves, light walnut, sea buckthorn, Caragana, Locust and other tree species have strong adaptability to dry and cold environments. Drought in winter and spring, summer and autumn is the biggest obstacle to ensuring tree survival. The paper also compared the differences between the mode of construction and the traditional planting methods, and analyzed the purpose of the ecological environment protection and the relationship between the mode and the ecological environment