滇西南地区旱冬瓜优良种源的早期选择研究     

史富强  陈宏伟  袁莲珍  杨斌  陈伟  陈绍安  李江  孟梦  冯弦 《西部林业科学》2012,41(3):75-79

在镇沅、龙陵,瑞丽3个试验点,通过对15个种源99个旱冬瓜家系18个月的幼林的树高、胸径及材积的测定与分析,结果表明,(1)在旱冬瓜的地理种源间存在着丰富的遗传变异,不同种源幼林期在树高、胸径、材积生长上均存在着显著差异,表明在滇西南地区开展旱冬瓜优良种源的选择十分必要.(2)在3个试验点表现较好、较稳定的种源是瑞丽种源,材积的实际增益分别为,镇沅试验点34.2％、龙陵试验点40.2％、瑞丽试验点45.4％,瑞丽旱冬瓜种源可作为滇西南地区旱冬瓜人工造林的采种种源.  相似文献   

The genetic variation of inter‐provenance hybrids of picea abies and possible breeding consequences     

《Scandinavian Journal of Forest Research》2012,27(1-4):15-26

The variance of general combining ability (GCA) and specific combining ability (SCA) for height and diameter growth were estimated from a 13 years old provenance hybridization study in Norway spruce. The GCA variance component for both height and diameter growth was significant, but there was no significant SCA variance. Hybrid progenies outperformed the progenies from stands, but this superiority was not interpreted as a provenance heterosis effect. Estimated family heritabilities for height and diameter growth were moderately high (0.40 for both traits). A consequence of the low SCA variance for Norway spruce may be that clonal testing should replace progeny testing for estimating GCA.  相似文献   

Testing species of genus Abies for Christmas tree production in Norway     

《Scandinavian Journal of Forest Research》2012,27(8):653-663

Ten exotic Abies species were tested in two field trials, where the aim was to find suitable species and provenances for Christmas tree production in coastal and fjord areas in Norway. The material included 14 provenances of Abies nordmanniana, 3 provenances of Abies bornmuelleriana, 3 provenances of Abies koreana, 2 provenances of Abies amabilis, and 1 provenance each of Abies equi-trojani, Abies alba, Abies procera, Abies homolepis, Abies nephrolepis, and Abies forrestii. Field trials were established at Gulen in Sogn og Fjordane County and at Verdal in Nord-Trøndelag County. Christmas tree classification was done seven and eight growing seasons after establishment. The Christmas tree yield was higher in Gulen (64%) than in Verdal (45%), which is situated further north. Also, the survival and the height growth were higher in Gulen than in Verdal. A more humid climate and a longer growth season in Gulen may explain some of the differences. Of the 10 species, A. nordmanniana, A. homolepis, and A. bornmuelleriana produced the highest Christmas tree yield at Gulen, while A. homolepis and A. koreana had the highest yield at Verdal. Due to early bud burst, A. equi-trojani and A. bornmuelleriana are only suited for Christmas tree growing in the best climatic areas.  相似文献   

5个南洋楹种源的抗寒性初步研究   总被引：1，自引：0，他引：1  

黄华蓉  冼丽铧  柯碧英  陈红跃 《广东林业科技》2012,28(6):51-57

本研究以苗龄3个月的南洋楹(Albizia falcataria)苗木为材料,采用人工控制低温胁迫的方法,通过对其相对电导率、叶片水分饱和亏缺、超氧化物歧化酶活性和丙二醛含量等生理生化指标的测定,研究5个南洋楹种源的抗寒能力。结果表明:不同种源间的南洋楹幼苗离体叶片水分饱和亏缺、细胞膜相对透性、丙二醛含量及超氧化物歧化酶活性等均具有显著差异,综合评定5个种源的抗寒能力由强到弱依次为:Y1、N2、CK、N5、N3、N4。  相似文献   

鹅掌楸种源试验研究   总被引：1，自引：1，他引：0  

孙虹管兰华  陈红林曹健宋开秀  欧阳绍湘 刘晓武 《湖北林业科技》2012,(2):9-12

笔者以湖北省京山县鹅掌楸属种源试验林2个树种鹅掌楸与北美鹅掌楸共20个种源为对象,进行了14 a时的生长和主要木材性状的研究。结果表明:北美鹅掌楸的生长优于鹅掌楸,而木材性状则不及鹅掌楸。在胸径、树高、材积、基本密度和纤维长度5个测试性状中,各种源之间存在显著或者极显著差异,为优良种源的选择奠定了基础。相同试验材料不同试验点的结果存在较大分歧表明:鹅掌楸受到较强的环境因素影响,因此在进行种源选择时必须加以考虑。  相似文献   

杉木地理种源材性变异及建筑材优良种源评估   总被引：28，自引：0，他引：28  

孙成志  谢国恩 《林业科学》1993,29(5):429-437

对４个试验点１２个杉木种源的材性测定研究表明，种源间木材物理力学性质和纤维特征有较明显的变异，木材化学组分的变异相对较小。从与建筑材相关的主要性质发现南，北亚热带种源好，中亚热带种源较差的“Ｖ“形纬向变异趋势。种源原产地的气温因子是影响材性变异的主要作用因子。经综合评定，贵北，广东信宜和带陕西汉中，安徽霍山种源材质性能较好，可以在种源杂交或无性系选择中改良利用。  相似文献   

广西油茶不同种源蒴果质量和种粒数变异     

蒋新革  路迎春  肖继谋  王鹏良  吴幼媚  蔡玲 《林业科技开发》2013,27(3):39-41

研究分析了广西18个油茶种源的蒴果质量和种粒数的变异及其相关性,结果表明:蒴果质量和种粒数在不同种源间分别存在极显著差异和显著差异,其变异系数分别为25.41%和33.13%;种源间的表型分化系数分别为28.63%和12.38%,蒴果质量和果粒数呈极显著的正相关,最后根据蒴果质量和种粒数的信息将18个种源通过聚类分析分为3类。  相似文献   

Effects of variation in seed sources and pre-sowing treatments on seed germination of Tamarindus indica: a multi-purpose tree species in Bangladesh     

Md. Salim AZAD  Nurun NAHAR  Md. Abdul MATIN 《中国林学(英文版)》2013,15(2):121-129

We investigated the morphology and germination of Tamarindus indica seeds in order to discover the effects of variation in seed sources and pre-sowing treatments on germination. The experiment was carried out in the nursery of the Forestry and Wood Technology Discipline, Khulna University, Bangladesh. Seeds were collected from different but healthy trees from various locations in Bangladesh and subjected to four pre-sowing treatments, i.e., control, immersion in cold water (4°C for 24 h), immersion in hot water (80°C for 10 min) and scarification with sand paper. Seed germination was carried out in poly-bags with a mixture of topsoil and cow dung in the ratio of 3:1. The average length of the fresh seeds was 1.35±0.26 cm, their width 1.07 ±0.20 cm and thickness 0.69±0.11 cm. The results revealed that pre-sowing treatments affected the germination process of seeds, which significantly increased the germination percentage with the cold water (81.67%) and scarification with sand paper (82.33%) treatments, compared with those in the control (58.33%) and hot water treatment (59.00%). In all treatments germination started on average within 5 to 7 days after the start of the treatments and were completed from 13 to 19 days later. The greatest success in germination (82.33%) was found in scarification with sand paper, followed with 81.67% in the cold water treatment. The results of analyses of variance (ANOVA) showed significant differences (p<0.05) in germination closing dates, seed germination periods and germination percentages among the treatments but no significant difference among seed sources. However, the effect of the interaction between seed source variation and pre-treatment differed significantly in seed germination closing dates and germination percentages. We recommend cold water treatment (submersion of seed at a temperature of 4°C for a 24-h period) for seed germination of T. indica in rural Bangladesh.  相似文献   

Quantitative Genetic Variability in Picralima nitida (Stapf) from Seven Sources in Nigeria     

Alaba E. Gbadamosi 《Journal of Sustainable Forestry》2013,32(4):358-372

Intraspecific variation in useful tree species is a requirement for any improvement program. Fruits of P. nitida were collected from seven different sources along its geographic range in Nigeria; metrical traits of seeds and resulting seedlings were assessed as well as the biomass. There were significant (p ≤ .05) differences in seed metrical traits of length, width, and weight. Seeds from J4 had the highest germination percentage of 95%, while Ore had the lowest percentage of 70. Highest mean values of 2.22 g, 3.11 cm, and 95 for weight, length, and number of seeds per pod, respectively, were obtained from Edo seeds. There were significant (p ≤ .05) differences in seedlings height, collar diameter, number of leaves, internodes, stem dry weight, root dry weight, leaf dry weight, total dry weight, and leaf area among the sources. The highest mean values of 4.33 cm (collar diameter), 2.31 cm (internodes length), were obtained from Edo collection. Other seedling traits and biomass indices were highest in J4 provenance. J4 seedlings had the highest average relative growth rate (RGR) values of 0.0450 gg^?1 wk^?1 while Etemi seedlings had the highest average net assimilation rate (NAR) value of 0.0063 g² wk^?1. J4 propagule had the best overall performance and is therefore recommended as a seed source for the improvement and conservation of Picralima nitida.  相似文献   

不同种源文冠果1年生苗生长节律及性状相关性研究   总被引：1，自引：0，他引：1  

敖妍  刘觉非  陈浩  阮凤云  刘金凤  张行杰 《西北林学院学报》2019,(3):91-97

为揭示文冠果苗期生长规律,以内蒙古赤峰市乌丹镇、坤都镇和天山镇及河南三门峡市陕县、河北张家口市蔚县的1年生实生苗为材料,观测分析不同种群苗木生长节律及变异。结果表明,种源间及种源内苗高、地径、主根长、根、茎生物量、根茎比均差异极显著,各性状都是陕县最高;苗高及地径生长均呈“慢-快-慢”的“S”型曲线,Logistic方程均达极显著拟合水平。苗高、地径速生期分别是31~47d和24~44d,速生期内日均生长量分别为0.42cm和0.06cm。陕县和蔚县种源速生期持续时间较长,各生长阶段净生长量也是陕县和蔚县较高。在北京开展文冠果造林可以重点考虑陕县和蔚县种源。  相似文献