5个不同世代不同类型杉木良种苗期测定比较研究

Comparative study on the seedling determination of 5 different generations and different types of Cunninghamia lanceolata

以5个不同世代不同类型杉木良种为研究对象开展育苗对比试验。采用撒播方法进行播种,调查各品种苗木苗高、地径、轮枝数生长量指标,结果表明:(1)5个杉木良种的苗木平均苗高为63.17 cm,平均地径为0.76 cm,轮枝数3.44,整体上苗木粗壮,整体生长良好;(2)5个杉木良种之间的苗木在苗高和轮枝数上存在显著性差异,地径的变异系数为2.19%,表明不同世代不同类型良种之间,杉木苗木间地径的总体生长整齐性最强;(3)杉木初级种子园良种造林的母树林种子苗高最大,信丰引进洋口林场无性系建立的杉木3代种子园良种苗木地径最大、轮枝数最多;(4)以苗高、地径、轮枝数3个苗木生长量指标均不低于总体均值为标准比较,江西信丰杉木3代种子园种子苗期生长表现最优,其次是信丰杉木1代种子园种子,而信丰引进洋口林场无性系建立的杉木2.5代种子园种子表现不佳。(5)不同世代不同类型杉木良种苗期生长量指标两两之间均存在极显著的线性正相关关系。

Five different generations and different types of Cunninghamia lanceolata were selected as the research objects to carry out a comparative experiment of seedling growth in one year.The seedling height,ground diameter and wheel branch number were investigated.The results showed that:(1)The average seedling height of 5 C.lanceolata improved varieties was 63.17cm,the average ground diameter was 0.76cm and the wheel branch number was 3.44.The seedlings were strong and grew well as a whole.(2)There were significant differences in seedling height and wheel branch number among 5 C.lanceolata improved varieties.The coefficient of variation of ground diameter was 2.19%,which indicated that the overall growth regularity of the diameter of the ground between different generations and different types of improved varieties was the strongest.(3)The height of seed seedlings in the mother forest of fine seed plantation of C.lanceolata primary seed garden was the highest and the diameter and wheel branch number in the seed orchard of the third generation of C.lanceolata introduced from Yangkou forest farm by Xinfeng were the largest.(4)According to the standard comparison of seedling height,ground diameter and branch,the growth performance of the third generation seed orchard of C.lanceolata in Xinfeng,Jiangxi was the best,followed by the first generation seed orchard of C.lanceolata in Xinfeng,while the 2.5-generation seed orchard of C.lanceolata introduced from Yangkou forest farm in Xinfeng was not good at seed performance.(5)There was a significant linear positive correlation between the two indexes of seedling growth of different generations and different types of C.lanceolata.