本科毕业设计说明书第PAGE70页共NUMPAGES70页1引言1.1研究背景近几年来，园林绿化作为城市HYPERLINK"http://action.vogate.com/c/c.php?r=http%3A//www.google.cn/search%3Fq%3D%25C3%25E7%25C4%25BE%25BB%25A8%25BB%25DC%25B9%25DC%25C0%25ED%25CF%25B5%25CD%25B3%25D1%25D0%25BE%25BF%25CF%25D6%25D7%25B4%26sa%3D%25CB%25D1%25CB%25F7%25D2%25BB%25CF%25C2%26client%3Dpub-2286650004466994%26forid%3D1%26prog%3Daff%26ie%3DGB2312%26oe%3DGB2312%26safe%3Dactive%26hl%3Dzh-CN&aid=3590&sid=6235007045048341&click=1&url=http%3A//www.cjk3d.net/news&v=0&s=http%3A//www.66wen.com/10nx/shenglinshengchang/yuanlin/20051102/1476.html&rn=982806&k=%u73AF%u5883"\o"中国水资讯网.水论坛@Vogate.com"\t"_blank"环境建设的重要组成部分，有了新的发展机遇，同时也带动了苗木花卉生产的发展。随着社会进步，人民对居住环境的重视以及西部大开发，绿化苗木花卉的需求量越来越大。尤其是近十几年来，随着世界花卉产业的兴起，花卉种苗作为其中最为重要的一部分，正逐渐成为发达国家花木产业链中获利最大的新兴行业，其经济效益在发达国家农产品总产值中所占的比值越来越高。HYPERLINK"http://action.vogate.com/c/c.php?r=http%3A//www.google.cn/search%3Fq%3D%25C3%25E7%25C4%25BE%25BB%25A8%25BB%25DC%25B9%25DC%25C0%25ED%25CF%25B5%25CD%25B3%25D1%25D0%25BE%25BF%25CF%25D6%25D7%25B4%26sa%3D%25CB%25D1%25CB%25F7%25D2%25BB%25CF%25C2%26client%3Dpub-2286650004466994%26forid%3D1%26prog%3Daff%26ie%3DGB2312%26oe%3DGB2312%26safe%3Dactive%26hl%3Dzh-CN&aid=5841&sid=6235007045048341&click=1&url=http%3A//www.seawww.com/style/info/domain.asp&v=0&s=http%3A//www.66wen.com/10nx/shenglinshengchang/yuanlin/20051102/1476.html&rn=263851&k=%u56FD%u5185"\o"低价购买CN域名@Vogate.com"\t"_blank"国内不少大型企业也开始HYPERLINK"http://action.vogate.com/c/c.php?r=http%3A//www.google.cn/search%3Fq%3D%25C3%25E7%25C4%25BE%25BB%25A8%25BB%25DC%25B9%25DC%25C0%25ED%25CF%25B5%25CD%25B3%25D1%25D0%25BE%25BF%25CF%25D6%25D7%25B4%26sa%3D%25CB%25D1%25CB%25F7%25D2%25BB%25CF%25C2%26client%3Dpub-2286650004466994%26forid%3D1%26prog%3Daff%26ie%3DGB2312%26oe%3DGB2312%26safe%3Dactive%26hl%3Dzh-CN&aid=4541&sid=6235007045048341&click=1&url=http%3A//www.topfo.com&v=0&s=http%3A//www.66wen.com/10nx/shenglinshengchang/yuanlin/20051102/1476.html&rn=751937&k=%u6295%u8D44"\o"拓富?中国招商投资网@Vogate.com"\t"_blank"投资“绿色银行”的苗木花卉生