中国马褂木不同种源苗期生长规律研究

对中国马褂木6个种源(云南金平、浙江安吉、福建武夷山、贵州黎平、广西全州、江西庐山)一年生实生苗的苗高生长规律进行研究。结果表明:(1)各种源在苗高生长上存在着极显著的差异。(2)利用logistic曲线拟合其苗高生长方程,发现各种源苗高生长均呈现明显的"慢—快—慢"的"S"型生长节律。(3)利用有序样本聚类分析将苗木生长划分为幼苗期、生长前期、速生期、生长后期4个阶段,福建武夷山种源最早进入速生期,且持续时间最长,江西庐山种源最晚进入速生期,且持续时间最短。速生期苗高净生长量占总生长量最大的是浙江安吉种源,达56.05%;第二是福建武夷山;最小的是江西庐山种源,只有34.29%。(4)依据苗高和地径两个性状的聚类分析把6个种源分成三大类,第一类是全州种源,苗高生长表现最好;第二类是金平、安吉、武夷山、黎平种源;第三类是庐山种源。

Growth pattern of Liriodendron chinense seedlings from different provenances

Annual growth rhythms of Liriodendronc hinense Seedlings from 6provenances(Jinping of Yunnan,Anji of Zhejiang,Wuyi Mountain of Fujian,Liping of Guizhou,Quanzhou of Guangxi,Lushan Mountain of Jiangxi) were studied.The results were as follows:(1) The variance analysis of different provenances showed that the differences between tree heights were significant.(2) The height growth of them was fitted by Logistic equation.The results showed that the growth patterns of height of different provenances were similar to ’ S ’ curves.(3) The height growth process of annual seedling was analyzed by the Sequence Cluster Method.The results indicated that the growth process of the seedling height could be divided into four stages,juvenile stage ;early growth stage ;rapid growth stage and late growth stage.Wuyi Mountain provenance entered the rapid growth stage at first and lasted the longest time.Lushan Mountain provenance entered the rapid growth stage at lasted and last the shortest time.The height increment of Anji provenance in the rapid growth stage accounted for the largest proportion of the annual height increment,up to 56.05%,Wuyi Mountain provenance second,and Lushan Mountain provenance the lowest,only 34.29%.(4) 6provenances were analyzed by hierarchical clustering,then were divided into 3groups.The first group included Quanzhou provenance,which had the best height growth.The second group included Jinping,Anji,Wuyi Mountain,Liping provenances.The last group included Lushan Mountain provenance.