排序方式: 共有9条查询结果,搜索用时 15 毫秒
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黑荆树巨尾桉混交造林与效益分析 总被引:3,自引:0,他引:3
设计了以黑荆树与巨尾桉混交的3个模式、黑荆树纯林、巨尾桉纯林共5个处理进行试验。经过一个轮伐期6a的观测研究,结果表明以黑荆树4巨尾桉1的混交比例作株间混交的模式最为理想,6年生林分总蓄积量达72.1m3·hm-2,其中巨尾桉46.1m3·hm-2,黑荆树26.0m3·hm-2,投入产出比为1∶3.4。 相似文献
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Dalbergia odorifera T. Chen is one of the two most precious tree species naturally distributed in China. The grafting techniques of D. odorifera were studied through comparing grafting methods, grafting seasons, rootstock grades as well as scion buds. The results showed that both "scarf joint grafting" and traditional cleft grafting were feasible for stem grafting. The two-bud "scarf joint grafting" got the best survival rate, while the cleft grafting was easy to operate. The best grafting seasons varied in the light of climate. In the warm southwest of Hainan island, the best grafting season was winter when the survival rate could achieve as high as 99.1%. While in Guangzhou, the best grafting season was the end of fall, and the corresponding survival rate was 94.6%. The quality of rootstock as well as scion bud affected the growth of scion bud directly. The growth of grade I buds/grade I rootstocks were 17 times that of grade III buds/grade III rootstocks. The study was beneficial for the preservation of high quality germplasm resources as well as for clone grafting of D. odorifera. 相似文献
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福建省降香黄檀引种适宜区研究 总被引:1,自引:1,他引:0
以福建省降香黄檀15个引种区的调查结果为基础,采用因子分析方法对地理气候因子进行分析;采用相关性分析,分析各项生长指标之间及与各气候因子间的相关性;采用欧氏距离、离差平方和法对各引种地地理气候因子和各项生长指标进行聚类分析,根据聚类结果对引种地进行初步区划。结果表明:引种栽培的主导气候因子是年均气温、年日照时数和海拔。保存率、生长量、适应性都与1月平均气温、≥10℃年积温呈显著或极显著正相关;抗寒等级与9、10月相对湿度呈显著的正相关;海拔与降香黄檀各项生长指标都呈负相关关系;除树高外,各项生长指标都与北纬呈负相关。引种区地理气候条件可以区划为3个区,Ⅰ区处于更高纬度地区(25°28'—26°20'),可定为散生区;Ⅱ区纬度较低(在23°28'—25°00'),可定为较适宜区;Ⅲ区为适宜区。 相似文献
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在闽南低海拔山地开展大果紫檀 (Pterocarpus macrocarpus) 种源引种试验,对引种的大果紫檀种源的生长和木材材性进行调查测定分析与评价,结果表明,10 a生大果紫檀的保存率以种源3号最高,达81.2%,种源6号最低仅为70%,但种源间保存率差异不显著。大果紫檀2号和3号生长迅速,而前期生长较好的大果紫檀1号后期生长放缓,其树高、胸径和材积均低于大果紫檀2号、3号和4号;10 a生不同种源大果紫檀间基本密度和含水率均无显著性差异,但大果紫檀5号的湿胀率显著高于其余5个种源,大果紫檀2号和3号的木材综合强度相对更高。综合引种保存率、生长性状和木材材性分析结果,初步选出大果紫檀2号和3号种源为优良种源,相对更适宜在闽南低海拔立地种植。 相似文献
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