不同遮光度下南方红豆杉生长研究
2021-11-03罗宁
罗宁



摘 要:为探明不同遮光度下的南方红豆杉生长规律,采用3处理3重复的不完全随机试验设计,处理1:强遮光>60%(Ⅰ型);处理2:弱遮光40%~60%(Ⅱ型);处理3:全光照(CK),分析遮光度对其生长的影响;通过解析南方红豆杉标准木,分析其胸径、树高、材积的生长规律。结果表明:遮光度显著影响15a生的南方红豆杉树高、地径、胸径和冠幅,显著影响造林保存率,但对高径比、冠径比无显著性影响。15a红豆杉的年平均胸径生长量0.99cm,年平均树高生长量0.40m,年平均材积0.0033m3,属中度速生树种。
关键词:南方红豆杉;生长;遮光;解析木
中图分类号 S791文献标识码 A文章编号 1007-7731(2021)19-0054-04
Research on the Growth of Taxus chinensis var. mairei under Different Shades
LUO Ning
(Mingxi National Forest Farm of Fujian Province, Mingxi 365200, Fujian)
Abstract: In order to explore the growth law of Taxus chinensis var. mairei under different shading degrees, an incomplete randomized experimental design of 3 treatments and 3 repetitions was adopted. Treatment 1: strong shading>60%(typeⅠ); Treatment 2: weak shading 40-60% (type Ⅱ); Treatment 3:full light(CK) to analyze the effect of shading on its growth; The growth law of DBH, tree height and volume of Taxus chinensis var. mairei was analyzed. The results showed that shading significantly affected the height, ground diameter, DBH and crown width of 15 year old Taxus chinensis var. mairei, and significantly affected the afforestation preservation rate, but had no significant effect on the height diameter ratio and crown diameter ratio. The annual average DBH growth of Taxus chinensis var. mairei is 0.99cm, the annual average height growth is 0.40m, and the annual average volume is 0.0033m3. It is a medium fast-growing tree species.
Key words: Taxus chinensis var. mairei; Growth; Shading degree; Parse tree
南方紅豆杉[Taxus chinensis var. mairei]是我国重要的珍贵耐阴常绿树种[1],具有树形开阔、树干通直显红色等特性。冠以“中国红豆杉之乡”美誉的福建省明溪县以南方红豆杉作为产业来发展,具有广泛的种植基础。南方红豆杉在林业种植上有大量的经验,欧建德等人开展南方红豆杉遗传选育[1,3,9]、冠形性状[2,6,7]、树形培育[2,4,7]和南方红豆杉珍贵用材的林下培育[5-7]、林下生境[5-8,9]等方面的研究。查阅文献发现前人对天然南方红豆杉[10]、江南油杉[11]的生长规律研究,有关人工南方红豆杉在不同遮光环境下生长规律的研究较少,因此,为南方红豆杉产业发展,本研究分析南方红豆杉在不同遮光条件下的生长性状,用树干解析法对15a生南方红豆杉标准木树干解析与分析,以期为南方红豆杉的林冠下栽培与研究提供依据。
1 材料与方法
1.1 研究区概况 福建省明溪国有林场城关管护站……
