乐东拟单性木兰绿化苗木繁育技术及生长规律的研究

Study on Breeding Techniques and Growth Rhythm for Parakmeria lotungensis

对乐东拟单性木兰播种苗及2 a生以上绿化苗木进行培育技术和生长规律研究。结果表明:乐东拟单性木兰大田育苗播种量以20～25 g/m^2为宜。1 a生苗高平均55.6 cm,平均地径0.67 cm,主根长26.1 cm,根冠32.6 cm×29.9 cm,>5 cm长Ⅰ级侧根数9.8根,根系较发达,当年可出圃。10 a生绿化大苗平均高达(617±31.97)cm,平均胸径(15.66±1.18)cm,冠径(447±31.85)cm,生长速度较快。每年的6～8月是苗高、径生长最快时期,应加强肥水管理,促进苗木生长。

With the optimal Parakmeria lotungensis seeds as test materials,the seed parameters,breeding techniques and seedling growth rhythm of Parakmeria lotungensis were studied.The results showed that the field seedling density should be 20～25 g/m^2;The average height of 1 year old Parakmeria lotungensis seedlings was 55.6 cm with average ground diameter of 0.67 cm,main root length of 26.1 cm and the number of I grade lateral root which length was above 5 cm was 9.8 strips with developed root crown 32.6 cm×29.9 cm,and the seedlings could be used for afforestation.The seedling grow fast relatively,so 11 years old seedlings could reach diameter at breast height（15.66±1.18） cm,height （617±31.97）cm,crown（447±31.85）cra The growth peak of seedling height and stem was from the July to the August, and in the period,fertilizer management could advance seedling growth.