香椿生长规律初步研究

Preliminary study on growth law of Toona sinensis

笔者采集了贵州省关岭县人工培育的32年生香椿,通过树干解析和聚类分析,研究其生长规律。结果表明,香椿在幼龄阶段树高生长较快,15年以前其平均生长量在1.4m以上,生长高峰期出现在第9年,年生长量1.633m;胸径生长高峰期在第9年,年平均生长量达1.95 cm,18年后至32年,年平均生长量仍达到1.3 cm以上;在30年前,材积增长一直处于上升阶段,并出现两次高峰。香椿至32年时,可分为3个生长期,即:幼龄期、速生期和成熟期。并运用SPSS 13.0软件对胸径、树高、材积总生长量建立了模型。

The growth process of Toona sinensis cultivated 32 years was studied by trunk and duster analysis. The results showed that height growth was quick during young stage. The height growth in the first 15 years reached 1. 4m/year,and the peak period was in the ninth year with the increment of 1. 633 m/year; Diameter growth reached 1.3cm/year from thelgyear to 32year and the peak period was,in the ninth year with the increment of 1.95 cm/year Volume increment lasted less than 30 years with two peak periods, During 32 year, its growth could be divided into three stages （ young stage, fast - growing stage and mature stage）. The total increment models on height, diameter and volume of Toona sinensis were estabhshed through SPSS 13.0.