对一些不太优良的树种,或想制作一盆多色花盆景,嫁接换冠不失为一良策。笔者在十余年的树桩盆景嫁接换冠作业中,总结出一些教训和经验。今以川黔紫薇(也称马灵光、马灵花或山紫薇)的嫁接换冠为例撰写此文。桩体健壮是嫁接成败的关键。不论是地栽大型桩,还是盆中小品都须先壮其本而后方能嫁接换冠。对新植树桩最好先放养一年或更长时间,待根系发达、桩体健壮,再行嫁接。从早春3月到8月底均可实施嫁接换冠术。选阴晴天气操作。枝接芽接均可。笔者习惯在七、八月高温天气下进行,效果不错,且在一个月左右就能愈合,当年还能开花。高温天嫁接的优点是接穗生长快、愈合好。但对接穗必须进行全封闭(用专用嫁接薄膜或地膜将接穗全部包裹,风雨不进),不然,接穗易被烈日烤干导致失败! For some not very good species, or want to make a pot of multicolor flowers bonsai, grafting for the crown after all, a good policy. The author in more than ten years of stump bonsai for crown operation, summed up some lessons and experience. Now in Sichuan and Guizhou Ziwei (also known as Ma Linguang, Mali or Lagerstroemia crassifolia) as an example to write this article. Stable pile is the key to the success or failure of grafting. Whether it is planted large piles, or pots and pans must first Zhuang its then before grafting crown. Stumps on the best new stocking for a year or longer until the root system developed, sturdy pile, and then grafted. From early spring to the end of August can be implemented graft replacement crown. Choose cloudy and sunny weather operation. Buds can then pick branches. I used to practice in hot weather in July and August, the effect is good, and can be healed in about a month, then still blossom. The advantage of grafting at high temperature is that the scion grows fast and heals well. However, the scion must be fully enclosed (with a dedicated grafted film or film will be all wrapped scion, wind and rain do not enter), otherwise, scorched easily scorched sun led to failure!