寿宁县不同海拔高度苦楝生长效应分析

采用单因素随机区组设计,在寿宁县境内选择立地条件基本一致的不同海拔茶园抛荒地进行苦楝造林试验。通过对4年生苦楝人工林的生长状况调查表明:不同海拔高度对苦楝人工林的造林成活率和保存率的影响不显著,对平均胸径、树高、立木材积的影响均达极显著水平。海拔高度是影响苦楝生长的重要因子之一,在海拔高度700 m以下,苦楝人工林的平均胸径、树高生长量大,立木材积产量高,林分长势良好;海拔高度超过700 m,则林分长势差。

The Analysis of Growth Effect of Melia azedarach at Different Altitudes in Shounig County

Taking the single factor randomized block experiment design method,selecting the tea plantations abandoned land with the sane site conditions consistent at different altitudes in Shouning County,Melia azedarach afforestation experiment was conducted.By 4-year-old Melia azedarach plantation growth status investigatiobn,the results showed that: the impact of different altitudes on Melia azedarach plantation survival rate and preservation rate was not significant.The impact on the average DBH,tree height,and tree volume of differences were highly significant.The altitude was one of the important factor affecting Melia azedarach growth,at the altitude of below 700m,the average DBH,and tree height growth amount were big,stem volume had high yield,stand grew well.At the altitude of more than 700m,stand had poor growing.