细枝木麻黄在干热河谷的适应性及生长比较研究

目的]对云南干热河谷引种的细枝木麻黄,与海南和广东的相同种源进行生长分析。方法]选取种源编号17、18的澳大利亚引种木麻黄于2002年11月播种育苗。随机产生4个试验点,每区种植苗种20株,株行距1.5×3m,调查6个月、18个月、36个月样株生长情况,并记录树高、胸径、冠幅、保存率等数据,应用SAS软件分析、统计。结果]结果表明：4个点36个月平均单株材积排序为尖峰岭镇〉澧江镇〉朵美乡〉龙颈镇,2个种源单株材积以18〉17号,其中18号比17号高15.38%;细枝木麻黄在干热河谷地区具有一定适应性,引种选择工作有实际意义;细枝木麻黄在干热河谷地区更适生于该流域内中下游位置,流域上游的生长和保存率相对较差。结论]细枝木麻黄在干热河谷地区具有一定适应性;4个试验点的2个细枝木麻黄种源间在生长上不存在显著差异。

Study on Adaptability of Australian Beefwood in the Dry-hot Valley Region and Its Growth

Objective]The analysis of Australian beefwood(Casuarina cunninghamiana Miq) growth,which was introduced and planted in in the dry-hot valley region in Yunnan,and the tree growth of same family in Hainan and Guangdong was done.Method]The No.17 and No.18 of the Australian beefwood introduced from Australia,sown in November 2002,being randomly taken as experimental material with four experimental sites(20 plants per each site and the planting distance of 1.5×3 m),the growth character including the height of tree,the diameter at the height of its breast,the width of crown,the preservation rate and others in the 6th months,18th month and 36th month was investigated and the data were statistically analyzed with SAS software.Results]The results showed that the order of the average growth volume per plant at the 36th month in 4 sites was Jianfengling Town > Lijiang Town > Duomei Town > Longjing Town and the growth volume per plant of No.18 of the Australian beefwood was more than that of No.17,with 15.38% of No.18 higher than that of No.17.It had the actual significance to introduce and plant the tree because it was with certain adaptability in the dry-hot valley region.The Australian beefwood was more appropriate growth in the middle and lower reaches of the river basin in the region and the rate of growth and preservation of it in the upstream of the valley region was relatively poor.Conclusion]The Australian beefwood had certain adaptability in the dry-hot valley region and there was no significant difference in the growth of two experimental materials in 4 sites.