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一、苗源和苗木质量高速公路绿化树种选用多以桧柏等常绿树为主,松柏苗源以河南产的河南桧为好,如果能选用河北省当地培育的河南桧则更好,但应当注意土球松散或不带土球的一定不能用。另外,不可在疫区调苗木。苗木规格一般树高1.8～2米、冠幅50厘米即可,土球直径35～40厘米为宜。有的路段选用苗木在2.5米以上的桧柏,栽后剪去头部60厘米,这样只是定植以后桧柏冠幅较大,防眩效果好,但剪去上部优势部分后,树冠下部长势弱,而且稀疏透光,甚至枯黄,绿化效果不好。在互通区上交段中央分隔带栽植桧柏可选用1.4～1.6米的河南桧,培养成桧柏球。既不过高又有一定的遮光防眩能力。池栽桧柏作为生
First, the quality of Miao and seedlings of green highway tree species selection mostly cypress cypress and other evergreen trees, pine and cypress source Henan Henan Henan cypress is better, if you can choose to cultivate in Henan Province, Henan cypress is better, but It should be noted that the soil should not be used loosely or not. In addition, you can not adjust seedlings in the affected area. Seedling specifications generally 1.8 to 2 meters high tree, 50 cm crown width, soil ball diameter of 35 to 40 cm is appropriate. Some sections of the seedlings used in more than 2.5 meters of cypress, cut off his head after planting 60 cm, this is only after planting cypress cymbal crown larger, anti-glare effect is good, but after cutting off the superior part of the upper canopy growth weak , But also sparse light, or even yellow, greening effect is not good. In the exchange area on the section of the central section with cypress planted cypress cypress optional 1.4 ~ 1.6 m Henan cypress, cultivate cypress ball. Neither too high nor have a certain degree of shading glare. Pond cypress cypress as a living