桉树无性系区域测定及经济效益评价

对11个桉树6 a生无性系在广东省江门市低丘台地进行了区域测定,结果表明：树高生长表现最好的前3名分别是广9、DH32-29和196无性系,胸径生长表现最好的前3名分别是196、DH32-29和广9无性系,单位面积蓄积最高的前3名分别是196、广9和DH32-29无性系.综合分析结果,196无性系在6 a生时,树高为19.33 m,胸径为13.55 cm,单位面积蓄积为173.75 m3/hm2,单位面积木材价值为93 831.70元/hm2,是非常值得推广种植的无性系.

Field Trails and Economic Benefits of Different Eucalyptus Clones

The field trails and economic benefits of eleven eucalyptus clones （6 years old） were conducted on a low hill in Jiangmen city of Guangdong province.The results showed that：Guang 9,DH32-29 and 196 ranked in the top 3 of the plant height.196,DH32-29 and Guang 9 ranked in the top 3 of the diameter at breast height （DBH）.196,Guang 9 and DH32-29 ranked in the top 3 of the volume per hectare which was determined by plant height,DBH and conservation rate.According to the results,6 year-old of clone 196,the height,the diameter at breast height and the volume of per hm2 were 19.33 m,13.55 cm and 173.75 m3/hm2,respectively; and its economic benefit was 93 831.7 RMB/hm2.196 was the best clone which was worth promoting in Jiangmen city of Guangdong province.