2008年第29届奥运会在北京举行,2010年上海举办世博会。为了在当年就能取得理想的绿化效果,全国大小城市都开始栽植大规格的绿化苗木。乔木用量排在前10位的香樟、广玉兰、雪松、樟树、水杉、银杏等品种,要求规格在6厘米以上的苗木供应比较紧张。而为了筹备2008年奥运会,北京近 The 29th Olympic Games in 2008 was held in Beijing and the 2010 Shanghai World Expo was held. In order to achieve the ideal greening effect in that year, large and small greening seedlings have been planted in cities across the country. Trees top 10 camphor, Magnolia grandiflora, cedar, camphor, Metasequoia, ginkgo and other varieties require specifications more than 6 cm seedling supply more nervous. In preparation for the 2008 Olympic Games, Beijing is near