共查询到19条相似文献，搜索用时 218 毫秒
1.
2.
3.
铅笔柏引种育苗与造林技术初步研究 总被引：2，自引：0，他引：2
辽宁省章古台从１９９４年开始引种铅笔柏，进行育苗与造林试验。试验结果认为，铅笔柏种子处理需要从１月下旬至４月下旬，约９０ｄ时间，发芽率较高；而从３月中旬至４月中旬开始处理的种子，因经过低温阶段时间短，故发芽率较低；铅笔柏越冬干梢与种源关系很大，美国南达科他州种源基本不受冻害，面安徽种源干梢较重，不宜直接引种；该树种在水肥充足条件下生长很快，４年生苗高达１．０５ｍ。 相似文献
4.
“铅笔柏种源及栽培技术引进”项目由国家林业局“９４８”项目管理办下达，为了搞好此项目，项目组成员从２００１年３月１３日到４月１日，对我国铅笔柏引种较早、报告较多的江苏、安徽、河南等省及沿途进行了实地考察。铅笔柏在我国的引种概况铅笔柏又名北美圆柏、红柏，原产北美洲的东部及中部，为常绿大乔木，树高可达３０余米，胸径３米～４米，寿命长，是圆柏属中生长最快的树种。其树冠优美，是优良的园林绿化树种；材质柔软，木理通直美观，芳香，坚固耐用，是家具、工艺品和建筑用的良材，是珍贵的用材树种；又因材质细，均匀一致… 相似文献
5.
选择墨西哥柏、园柏、侧柏、余甘子、大叶榕、车桑子在洱海面山作造林树种试验.试验结果表明在6个试验树种中,墨西哥柏是最适合在洱海面山上造林的绿化树种. 相似文献
6.
通过在砚山县铳卡农场对墨西哥柏、郭芬柏、冲天柏和杜仲4个不同树种以及不同的造林密度、施肥措施、育苗措施与喷洒云大-120处理等5个因素的对比试验，其幼树期(3年生)的试验结果表明：树种对林木的生长量、生物量及造林保存率影响显著，其他因素对林木生长的影响被树种的影响所削弱。同一树种在其他不同处理间的差异较明显，参试的墨西哥柏、郭芬柏、冲天柏和杜仲的造林技术措施的最佳组合分别是A1B2C2D1E2、A2B2C2D2E1、A3B1C3D1E2和A4B1C4D2E2。3年生墨西哥柏最佳组合的树高为3．4m、地径4．8cm、冠幅1．09m，生物量为29．348t／hm^2；冲天柏最佳组合的树高为2．66m、地径3．88cm、冠幅0．74m、生物量为19．000t／hm^2；郭芬柏最佳组合的树高2．42m、地径3．73cm、冠幅0．87m、生物量为18．548t／hm^2。预计在滇东南岩溶山区选择墨西哥柏、冲天柏和郭芬柏，采用最佳技术措施组合造林，能取得良好的生态效益和一定的经济效益。 相似文献
7.
西藏柏引种育苗造林试验技术总结 总被引：1，自引：0，他引：1
西藏柏原产西藏，云南，印度等地，是一个喜钙的速生用材和庭园观赏树种，木材具有多种多用途，枝叶皆有用，为了绿化石灰岩山地和开发困难造林地石山，我们引进了西藏柏，对其育苗与造林技术进行了研究，获得了成功，认为西藏柏是石山造林的一个好树种。 相似文献
8.
9.
藏柏(Cupressus torulosa D·Don)又名西藏柏木、喜马拉雅柏木,为柏科柏木属的常绿高大乔木,在我国主要分布在西藏东南部.藏柏树干通直,木材纹理直,结构细密,材质坚硬,有香气,耐用,易加工.树冠苍翠挺拔,是珍贵的速生用材和庭园观赏树种.为了解藏柏引入本地区的适应性和生长规律,我场开展了试验.结果表明,藏柏年高生长有2～3次高峰,在9月前后生长最快,在不同立地条件下与柏木比较,其高生长变化规律亦有不同,造林后第3年树高、胸径年生长绝对值达到最大值,高、径生长均优于引进的绿干柏、地中海柏、滇柏、墨西哥柏和乡土种柏木. 相似文献
10.
11.
在福建省邵武市洪墩采育场，调查丝栗栲林标地１０块，做平均木、树干解析木９株，杉木人工林标地２块，研究丝栗栲的生长与生产力，结果表明：丝栗栲林的胸径、树高及单株材积总生长量，均随年龄的增加而增加；胸径２０ａ前生长最快；树高１６ａ前生长最快；材积３６ａ时尚未有下降的趋势。胸径、树高平均生长量，随年龄增加而增加，当生长量达高峰后，则随年龄的增加而下降；胸径生长高峰，好立地１２ａ，中、劣立地１５ａ；树高生长高峰，好立地１０ａ，中立地８ａ，劣立地１２ａ；材积平均生长量，随年龄增加而增加，好、劣立地３６ａ时仍未下降，中立地３４ａ时生长量最大。胸径、树高连年生长量随年龄增加而下降；材积连年生长量，随年龄增加而增加，当生长量达高峰后，则随年龄增加而下降，生长高峰出现的年龄，好立地２８ａ，中立地２２ａ，劣立地２６ａ。在相似的立地条件下，丝栗栲林的蓄积量比杉木人工林低，但乔木层总生物量比杉木林高。 相似文献
12.
13.
[目的]研究山地木麻黄种源间抗风性、生长及形质性状的遗传变异规律,为山地木麻黄的良种选育和种质资源的合理开发利用提供科学依据。[方法]以27个山地木麻黄种源为试验材料,于造林后2、5、7 a时测定山地木麻黄种源的树高、胸径、单株材积和保存率等数量性状,并于造林后7 a时调查主干分叉习性(AP)、主干通直度(SFS)、侧枝密度(DPB)、侧枝直径(TPB)、绿色小枝长度(LDB)、侧枝分枝角(APB)、侧枝长度(LPB)等形质性状以及抗风性(RES),通过方差分析、相关性分析及遗传参数估算揭示其遗传变异规律。应用坐标综合评定法对山地木麻黄种源进行综合评定。[结果]表明:造林后2、5、7 a时,27个山地木麻黄种源间保存率和抗风性差异显著(P0.05);对造林后7 a时保存率较高的18个种源进一步分析显示,上述3个年份各种源间树高、胸径和单株材积等生长性状均存在极显著差异(P0.01);7 a时,TPB、APB、LDB、AP和SFS等形质性状在种源间亦存在显著或极显著差异;生长性状的种源遗传力明显高于形质性状,二者分别受中度或中度偏下和低度遗传控制;随着林龄的增长,树高的遗传变异系数变化不大,而胸径和单株材积的遗传变异系数呈先增加后降低的趋势,树高、胸径、单株材积的遗传变异系数分别为11.89%~12.30%、11.67%~13.67%、30.20%~38.11%;7 a时,形质性状的遗传变异系数为3.84×10~(-5)%~5.56%。性状间相关分析表明:树高作为山地木麻黄早期选择性状较适宜。[结论]依据坐标综合评定法,筛选出17877、19489和19490等3个优良种源,可在生产上大面积推广。 相似文献
14.
广东省江门地区为调整人工林树种结构 ,提高人工林的产量和质量 ,发展以阔叶树种为主的人工林。现桉树 ( Eucalyptusspp.)已成为该市营造短轮伐期工业用材林的主要树种 [1] 。本试验的目的在于通过从澳大利亚引进桉属树种 ,进行桉属树种 /种源试验 ,为江门市选出更适合当地生长的优良桉树树种和优良种源 ,促进该地区桉树人工林的发展。1 试验地概况 试验地位于广东省开平市镇海林场 ,2 2°2 5′～ 2 2°40′N,112°15′～ 112°45′E。属南亚热带气候 ,年平均温度 2 2 .1℃ ,极端最高温度 38.3℃ ,极端最低温度 1℃ ,年平均降水量 182… 相似文献
15.
By afforestation trial, the adaptation and growing states of 5 Banksia robur provenances in Jianfengling of Hainan were studied, and the effects of provenance and fertilizer treatment on the survival rate, height and ground diameter were analyzed. The results showed that all the 5 provenances had a good adaptability in Hainan province. 2 months after planting, the survival rate was 85%, but it was easily affected by air humidity and became lower in the dry season, especially the provenance No.38164, showing that the B. robur needs wet environment. The study also found that different provenances and fertilizer treatments had significant impact and interactions on the growth of B. robur. The provenance No.38163 had the fastest grow speed, with 1.35 mm of ground diameter increment and 10.57 cm of height increment during 3 months, while the provenance No.38164 had the lowest grow speed. The provenance No.39163 also had a strong barren resistance, while the provenances No.38177 and No.38199 needed well water and nutrient conditions. Different fertilizer treatments could enlarge the difference in growth status of the provenances, and the composted cattle manure had the best effect on promoting growth status, which could be used as the best fertilizer in afforestation. 相似文献
16.
《Southern Forests》2013,75(2):85-92
A performance comparison of seven-year-old individuals of 13 Casuarina species/provenances in terms of survival, growth (diameter, height and volume), wood basic density and wood biomass was undertaken at Kongowe, Kibaha, Tanzania. The trial was laid out using a randomised complete block design with four replications. The results showed significant differences (P < 0.0001) in all parameters. Casuarina equisetifolia from Montazah National Park, Egypt, had the lowest untransformed survival (48.8%), whereas C. equisetifolia from Wagait Tower (North Timor), Indonesia, had the highest survival (87.5%). Casuarina equisetifolia from Montazah National Park, Egypt, had the lowest mean diameter (8.6 cm) while the C. junghuhniana provenance from Timor, Indonesia (seedlot no. 19489) had the highest diameter (14.8 cm). Casuarina equisetifolia from Montazah National Park, Egypt, had the lowest mean height (16.2 m), volume (22.1 m3 ha?1) and biomass production (23.5 t ha?1), whereas C. equisetifolia from Hadsamira Songkhla, Thailand, had the highest mean height (24.3 m), volume (66.4 m3 ha?1) and biomass production (72.9 t ha?1). In terms of wood basic density, the C. junghuhniana provenance from Timor, Indonesia (seedlot no. 19489) had the lowest (617 kg m?3), whereas C. equisetifolia from Wagait Tower (North Timor), Indonesia, had the highest (731 kg m?3). Ordinal ranking for the best-performing species/provenances revealed that the best two provenances were C. equisetifolia from Hadsamira Sonkhla, Thailand, and C. junghuhniana from Timor, Indonesia (seedlot no. 19491). The two poorest-performing provenances were C. equisetifolia from Montazah National Park, Egypt, and C. equisetifolia from Cotonou, Benin. The outstanding species/provenances are recommended for pilot planting at Kibaha and similar sites. 相似文献
17.
辐射松、马尾松、长叶松与晚松人工林的生长规律比较研究 总被引：4，自引：0，他引：4
对九峰试验林场的辐射松、马尾松、长叶松及晚松人工林生长规律的研究结果表明 :长叶松生长最慢 ,而不宜大面积发展 ;辐射松、马尾松与晚松均表现较好 ,且辐射松与晚松材积生长速率高于马尾松 ,至 2 2a后 ,辐射松材积的生长速率将超过晚松 ;辐射松 4a时胸径连年生长量最大 ( 1 85cm) ,树高速生期为 1 2～ 1 6a,材积速生期为 1 4～ 1 7a,数量成熟龄在 40a之后 ;马尾松 4a时胸径连年生长量达最大 ( 1 30cm) ,1 3a树高连年生长量达最大 ( 3 5 0m) ,材积连年生长量 2 8a最高 ( 0 0 1 60 1m3) ,数量成熟龄为 35～ 40a ;晚松胸径连年生长量在第 3年达最大 ( 1 85cm) ,平均生长量 9a时达最大 ( 1 0 8cm) ,树高速生期为 3～ 8a ,材积速生期为4～ 1 5a ,数量成熟龄为 2 5a。 相似文献
18.
In 1995 a species/provenance test was established in the state of Puebla, Mexico to assess and compare the growth of Pinus greggii var. australis, P. maximinoi, P. patula and P. tecunumanii, including 10, 5, 11 and 4 provenances of each species, respectively. Each provenance test lot consisted of seed from 7 to 10 individual trees collected in natural stands. Range-wide samples were included in the test for P. greggii var. australis and P. patula. Material of P. maximinoi and P. tecunumanii from Guatemala, Honduras and Nicaragua, as well as Mexico was established in the test. The test site is in a mountainous area at 1440m elevation, near 20°N latitude. At 5 years of age significant differences were seen at both the species and provenance levels in survival, total height, diameter and volume. The overall test survival was 93%. Variance among species was three time greater than among provenances, comprising 25–33% of the total variation. P. maximinoi had the greatest height, diameter and volume (62dm3) followed by P. tecunumanii (53dm3). P. greggii var. australis had an average volume of 43dm3 and P. patula produced 30dm3. Although P. maximinoi had the lowest survival rate, the San Jeronimo provenance was the most productive of all 30 provenances tested; 98% survival and 73dm3 volume. This was equivalent to 2.8cm annual diameter increment and 2m in height growth per year. Significant growth differences among provenances within species indicate that potential gain exists using provenance selection. 相似文献
19.
本文分析了引自澳大利亚东部的桃金娘科伞房属4个树种或亚种在广东省德庆试验点的早期生长表现。结果表明：10年生时，4个树种或亚种生长量最大的是斑皮柠檬桉，其次是大叶斑皮桉(Corymbia henryi)、柠檬桉和斑皮桉，平均单株材积分别为0.2026、0.1748、0.1634和0.0526 m3；与8年生时比较，4个树种或亚种在10年生时仍保持较快的增长速度，材积增长均在15%以上。方差分析结果表明：试验组Ⅰ内，柠檬桉和大叶斑皮桉3个生长性状在家系间差异极显著(P＜0.01)；种源间胸径差异达显著水平(P＜0.05)，树高和单株材积无显著差异；在试验组Ⅱ，斑皮柠檬桉和斑皮桉的3个生长性状在树种或亚种、种源、家系间差异极显著(P＜0.01)。以单株材积高于对照为选择目标，选出柠檬桉3个种源4个家系，斑皮柠檬桉4个种源11个家系，大叶斑皮桉2个种源3个家系，共计9个种源18个家系，分别占参试种源和家系总数的50%和19.4%。 相似文献