马鞍山江滩3个杨树无性系的生长比较

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

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。

Abstract：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, how- ever, 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.