马鞍山江滩3个杨树无性系的生长比较

对安徽省马鞍山市长江滩地8年生的Ⅰ-72、Ⅰ-69和中林46计3种杨树无性系混交林进行了调查。结果表明,中林46杨的胸径、树高和材积生长量均明显小于Ⅰ-72杨和Ⅰ-69杨。8年生的中林46杨平均材积只有0.199m3/株,Ⅰ-72杨和Ⅰ-69杨的平均材积分别是0.499 m3/株和0.360 m3/株。Ⅰ-72杨的胸径明显大于Ⅰ-69杨,但树高差异很小。就以上3种杨树无性系而言,中林46杨不宜在长江滩地上进行造林;Ⅰ-72杨和Ⅰ-69杨较适宜,尤其是在大株行距造林中,采用Ⅰ-72杨则更容易培育大径材。

Comparisons to the three poplar clones planted on riparian area of Yangtse river, Ma'anshan city

In order to select the poplar clones which are suitable to the riparian area conditions of Yangtse river,the mixed plantations of three poplar clones(Ⅰ-72,Ⅰ-69 and ’Zhonglin46’) were investigated in Ma’anshan city,Anhui province.The result showed that the diameter at breast height(DBH),height and volume of poplar ’Zhonglin46’ were significantly different from poplar Ⅰ-72 and poplar Ⅰ-69.The volume of poplar ’Zhonglin46’ in 8 years old was 0.199 m3per tree,however,the volume of poplar Ⅰ-72 and poplar Ⅰ-69 was 0.499 m3 per tree and 0.360 m3 per tree,respectively.The DBH of poplar Ⅰ-72 was larger than that of poplar Ⅰ-69,but the height of both poplar Ⅰ-72 and poplar Ⅰ-69 was similar to each other.These results indicated that the poplar ’Zhonglin46’ was not suitable to plant on the beach land of Yangtse river.Although both of the poplar Ⅰ-72 and poplar Ⅰ-69 could be used to plant on the beach land,the DBH and volume growth of poplar Ⅰ-72 were higher than that of poplar Ⅰ-69 when the planting space was larger.