补光对兰云杉和红皮云杉生长的影响   总被引：1，自引：0，他引：1  

李记英  许娜 《甘肃林业科技》2011,36(4):19-23

云杉苗期生长缓慢是生产中的主要问题,补光可促进苗木生长,缩短育苗周期,提高育苗效率.研究不同光源(阳光灯、镝灯、碘钨灯)、不同光照时间对兰云杉和红皮云杉1年生苗苗高、地径、侧枝数、根系、生物量等生长性状的影响,结果表明:光照处理可以抑制苗木休眠,促进其持续生长,对2种云杉的各生长指标均有显著的促进作用；不同光源、不同光...  相似文献   

Crown development in young Picea abies stands     

《Scandinavian Journal of Forest Research》2012,27(1-4):195-204

A dynamic model of branch length and weight growth was developed for two contrasting sites, both with young stands of spruce. At one site sample trees were obtained from both unfertilised plots and from plots with increased growth rate maintained by annual fertilisation. At the second site unfertilised trees and trees subject to single applications of fertiliser were modelled. A model of the same structure was developed for each site and tested by application at the alternate site. In view of the close agreement between sites, model parameters were calculated based on all data combined. The model is driven by height increment and branch age. The sample trees were mostly open grown so that only a tentative estimate of the effects of between tree competition is given. The limitations of the model are stressed.  相似文献   

Survival and Early Development of Lodgepole Pine     

《Scandinavian Journal of Forest Research》2012,27(4):410-423

The effect of site fertility, spacing and mode of regeneration on the survival and stand development of lodgepole pine, Scots pine and Norway spruce was studied in a series of experiments comprising 22 study areas in Finland. After 13-14 yrs, lodgepole pine had a mean survival of 68% in planted and 61% in seeded plots, while Norway spruce had the highest (92%) and Scots pine the second highest survival (82%). The survival of planted lodgepole pine was better the wider the spacing. Best survival was achieved on subdry and dry sites, both with planting and with direct seeding. Dominant height was not affected by spacing, but both basal area and volume at the age of 13-14 yrs were significantly higher the denser the spacing. The average difference in the value of the estimated site index H ⁵⁰ was slightly under 3 m for the superiority of lodgepole compared with Scots pine. Seeding resulted in site indices almost as high as those of lodgepole planting.  相似文献   

鳞毛蕨(Dryopteris filix-mas)天山云杉林种群结构分析   总被引：7，自引：5，他引：7  

刘翠玲  潘存德  梁瀛  刘政新 《干旱区研究》2006,23(1):60-65

以西天山国家自然保护区内1 hm2原始鳞毛蕨(Dryopteris filix-mas)天山云杉纯林临时标准地调查材料为基础,分析鳞毛蕨天山云杉林胸径、树高和年龄结构、种群存活曲线以及基本测树因子之间的相互关系.结果表明:①鳞毛蕨天山云杉纯林种群结构稳定,无论是胸径、树高抑或年龄,均呈现出明显的倒"J"型,属于典型的异龄林林分结构,林木更新良好,在其自维持过程中不断有大量小径木更新补充;②林木株数随胸径、树高和年龄的增大,呈负指数函数或负幂函数递减;③树木胸径和树高随年龄的增大,按理查兹生长曲线递增;④胸径与树高的关系为非线性关系.此外,种群存活曲线总体趋势呈现"凹"型,表明该种群是一个连续更新的种群,在林分生长发育过程主要受到小尺度林冠干扰的影响.  相似文献   

北美蓝云杉愈伤组织的诱导和培养     

孙敬爽  于海  贾桂霞 《北方园艺》2007,(7):173-175

以北美蓝云杉休眠芽、针叶、嫩茎为外植体,用0.1%HgCl2处理10～15 min消毒效果最好.在1/2LM 2,4-D(0.5～3.0mg/L以下单位相同) 6-BA(1.0～2.0)条件下,均能诱导出愈伤组织,休眠芽诱导率最高为77.36%.且以休眠芽诱导的愈伤组织在1/2LM NAA(0.5) 6-BA(1.0) IBA(0.1)能分化出少量针叶和芽.针叶和茎产生的愈伤组织增殖困难,继代培养后很快褐化.  相似文献   

Shape and distribution of knots in a sample of picea abies logs     

《Scandinavian Journal of Forest Research》2012,27(1):50-56

In an attempt to develop a better understanding of the effect of knottiness on the yield of logs for sawn timber products, the present study examines the position and geometrical characteristics of 429 knots found in seven Norway spruce (Picea abies (L.) Karst) middle logs from southern Finland. The raw data used in this study were in the form of coordinates of points located on the knot surface recorded in a cylindrical (R, L, T) reference frame. The data were smoothed using a non linear three‐dimensional model. A curvature analysis of the knot pith was used to differentiate the curved and straight portions of the knots. This analysis made possible calculation of knot angles, symmetry, ovality and volume. The major finding of this study is the uneven distribution of knots around the log circumference. Nearly 50% of the total knot volume was concentrated in one‐third of the log facing the south‐east. Knots were also more prominent in higher portions of the logs studied. These observations support the argument that the uneven distribution of knots offers potential for improving the grade yield of timber sawn from trees harvested in high‐latitude countries.  相似文献   

Reconstructing 100-150 years of logging history in coastal spruce forest (Picea abies) with special conservation values in central Norway     

《Scandinavian Journal of Forest Research》2012,27(6):591-604

Coastal spruce forests of central Norway harbour a unique assemblage of epiphytic lichens and are given high priority with respect to conservation of biodiversity. To assess the historical impact of logging during the last 100-150 yrs, 31 remnant stands were studied by means of tree-ring analysis of 2199 trees and the decay stage of 1605 stumps. No stands had been clear-cut, but all had been selectively logged at least twice during the last 150 yrs. Total harvested timber volume ranged from 65 to 409 m³ha-¹ (31-124% of present-day standing volume) and the selective logging kept standing volume low (40-200 m³ha-¹) during 1890-1930. Present-day stand characteristics were strongly correlated with site productivity and topographic position within the ravine valleys. Low amounts of dead wood at sites with high historical logging activity was the only consistent relationship found after covariance of site productivity, topographic position and deciduous trees were taken into account. The results indicate that old-growth stand characteristics, such as reversed J-shaped age distributions and dead wood in advanced decay classes, can be obtained 100-150 yrs after intensive selective logging.  相似文献   

谈红皮云杉“全光下雾插“育苗介绍     

左晓初  孔庆田 《林业勘查设计》2007,(3):47-48

从生物培育技术角度分析介绍了利用喷雾设备提高红皮云杉在全光条件下扦插成活率的方式方法。  相似文献   

天山云杉林林冠干扰前后植物多样性及其与环境的关系   总被引：3，自引：0，他引：3       下载免费PDF全文

刘云  侯世全  李明辉  潘存德 《林业科学研究》2005,18(4):430-435

林冠干扰后，林窗内因小环境的改变使得植被作出相应的反应。1999年对天山云杉林林窗内和林内的植被进行的调查结果表明：在本研究范围内的天山云杉林中，经过林冠干扰后，植被受一定的影响。林冠空隙内丰富度指数均大于林内；36．7％的林冠空隙内个体生态优势度小于林内；76．7％的林内的均匀度指数大于林冠空隙内；66．7％的林冠空隙Shannon个体多样性指数大于林内。林冠干扰前后，各环境因子和植物多样性之间有一定的相关关系。影响林冠空隙内各多样性指数的因子包括海拔、有效N、有机质、全K、全P和总盐，有效N、有机质、全K、全P和总盐对均匀度指数有显著性影响；而影响林内各多样性指数的因子包括坡向、坡位、坡度、光照强度、有效N、全K、全P和总盐，但仅有坡向、坡度、光照强度对生态优势度指数有显著性影响。  相似文献   

红皮云杉叶锈病病原菌的研究          下载免费PDF全文

郭廷举  杜亚琴  郭思琪  陈文颜  银静华 《林业科学研究》1990,3(5):533-535

红皮云杉叶锈病发生在小兴安岭林区,该林区的地理位置是48°～48°43′N,12°23′～130°19′E,总面积 51.8万 ha(包括东风、新青林业局)。此病害过去仅危害过伐林下层的幼龄林木,不引起人们的重视。但近年来已扩展到5～10年生的人工林木及林间苗圃的苗木上,严重地影响云杉人工林的生长量和苗木产量,给林业生产造成较大的损失(图版Ⅰ-1)。为此从1984～1986年开展了本项试验,现将有关病原菌接种试验和生活史部分的研究结果报道如下。  相似文献