应美国林务局克鲁格博士邀请于1989年6月17日—7月11日参加了第20届美国南方树木改良会议。与会代表共214人,主要来自美国南方的大学、科研、公司、试验站、种子园等;其次为澳大利亚、日本、芬兰等国的代表。会议共开二天半,会后进行了参观访问。 美国有威望的林木遗传专家A·E施昆来斯在会上作了重要发言。他说美国南方树木改良已有40年历史,并已取得较大成绩。截至1987年已有85％造林用苗是采用经改良的种子 At the invitation of Dr. Kruger of the U.S. Forest Service, he attended the 20th American South Tree Improvement Conference from June 17 to July 11, 1989. A total of 214 delegates, mainly from the South American universities, research, companies, test stations, seed orchard; followed by Australia, Japan, Finland and other countries. A total of two and a half days after the meeting, after the visit to visit. A · E Shi Kunluosi, a prestigious tree geneticist in the United States, made an important speech at the meeting. He said the tree improvement in the southern United States has been 40 years old and has achieved a great deal. As of 1987, 85% of afforestation seedlings use improved seeds