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锡兰龙脑香引种栽培研究 被引量:2
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作者 杨清 肖春芬 +2 位作者 张玲 苏光荣 韩蕾 《西北林学院学报》 CSCD 北大核心 2008年第5期99-102,共4页
为了揭示锡兰龙脑香在中国热带地区的适应性,丰富我国珍贵的优良的树种资源。中国科学院西双版纳热带植物园于1997年引种产自斯里兰卡南部的锡兰龙脑香种子,经28a的引种栽培观测表明。该树种在引种地生长迅速,年均生长量分别为1.06m和1.... 为了揭示锡兰龙脑香在中国热带地区的适应性,丰富我国珍贵的优良的树种资源。中国科学院西双版纳热带植物园于1997年引种产自斯里兰卡南部的锡兰龙脑香种子,经28a的引种栽培观测表明。该树种在引种地生长迅速,年均生长量分别为1.06m和1.85cm,特别是在造林5a后,生长极为迅速,树高连年生长量超过1.1m,胸径连年生长量超过2.5cm,与同一立地条件下栽培的其他国产龙脑香科树种相比,径粗生长超过任何一种树种。生长期较长,一般从2月初开始抽梢生长,至11月下旬12月初停止生长;开花结果正常,栽培后15a就开始开花结果,花期为4月中旬至5月中旬,果熟期为7月上旬至8月中旬。种子寿命短,不耐储藏,在自然条件下随着存放时间的延长,种子含水量和发芽率随之急剧下降。新鲜种子发芽率不高,为48.33%,利用种子已繁殖出一批新植株。表明该树种在西双版纳低海拔地区具有较好的适应性,能正常的开花结果,并且后期生长较快,适宜培养大径级材的速生优质用材树种。 展开更多
关键词 锡兰龙脑香 龙脑香科 引种栽培
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Design of a Tree Ring Structure Analysis System to Estimate the Accurate Age of Tree Species in Sri Lanka 被引量:1
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作者 Hasalanka DISSANAYAKE Sisaara PERERA 《Instrumentation》 2020年第3期50-59,共10页
Determination of an age in a particular tree species can be considered as a vital factor in forest management.In this research we have introduced a novel scheme to determine the accurate age of the tree species in Sri... Determination of an age in a particular tree species can be considered as a vital factor in forest management.In this research we have introduced a novel scheme to determine the accurate age of the tree species in Sri Lanka.This is initially developed for the tree species called‘Hora’(Dipterocarpus zeylanicus)in wet zone of Sri Lanka.Here the core samples are extracted and further analyzed by means of the different image processing techniques such as Gaussian kernel blurring,use of Sobel filters,double threshold analysis,Hough line tran sformation and etc.The operations such as rescaling,slicing and measuring are also used in line with image processing techniques to achieve the desired results.Ultimately a Graphical user interface(GUI)is developed to cater for the user requirements in a user friendly environment.It has been found that the average growth ring identification accuracy of the proposed system is 93%and the overall average accuracy of detecting the age is 81%.Ultimately the proposed system will provide an insight and contributes to the forestry related activities and researches in Sri Lanka. 展开更多
关键词 Hora(Dipterocarpus zeylanicus) Image Processing Gaussian Kernel Blurring Sobel Filter Double Threshold Analysis Hough Line Transformation Graphical User Interface
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