谈鹤北林业局珍贵树种用材林的定向培育

介绍了黑龙江省鹤北林业局珍贵树种用材林定向培育的试验情况,并简要阐述了珍贵树种用材林定向培育保障措施的重要性。     

海南省毛瑞林场珍稀濒危植物调查初报

在野外调查的基础上,初步统计海南毛瑞林场共有野生珍稀濒危植物72种,隶属于36科65属。其中属于1987年公布的野生植物保护名录的有22种;属于1999年公布的野生植物重点保护名录的种类有15种;被列入国际贸易公约的有28种;被列入海南省野生植物保护名录的有54种。最后对该地珍稀濒危植物保护面临的威胁进行分析,提出解决对策。     

珍稀植物生物学特性研究

本文报导了７０种珍稀植物在峨眉山低海拔区域内的物候节及部份种类的生长发育动态规律，并初步探讨了持理分布、遗传属性和亲缘关系与上述规律的关系。     

哺乳类珍稀濒危物种网络监测技术

对哺乳类珍稀濒危物种种群数量动态以及栖息地的网络监测技术进行了初步探讨,包括监测区的确定、监测网络的建立、监测人员的培训、野外信息的收集、数据的处理与分析等。     

贵州省珍稀濒危植物优先保护等级的定量研究

参考湖南省珍稀濒危植物优先保护分级指标方法,结合贵州省实际,对贵州省69种珍稀濒危植物及特有种进行了优先保护等级的定量研究,划分贵州省珍稀濒危植物优先保护等级,提出了贵州省珍稀濒危植物保护措施。     

稀土对尾叶桉幼林生长及土壤化学性质的影响

通过对稀土不同施用方式(稀土加入基肥、稀土溶液浸根和稀土溶液叶面喷施)对尾叶桉幼林的影响研究,结果表明:3种使用方法都对2.5 a生尾叶按幼林的生长起促进作用,在稀土加入基肥中,使用7.5 g/株效果最好;在稀土溶液浸根中,使用500 mg/kg效果最好;在稀土溶液叶面喷施中,使用200 mg/kg效果最好.从1.5 a生桉树幼林的单株生物量看,稀土加入基肥、稀土溶液浸根和稀土溶液叶面喷施3种施用稀土方式均使桉树幼林生物量得到不同程度的提高.稀土的3种施用方式均能使桉树幼林林地土壤养分含量得到不同程度的提高.影响程度的大小顺序为稀土加入基肥>稀土溶液浸根>稀土溶液叶面喷施.     

Gene flow pattern and mating system in a small population of Quercus semiserrata Roxb. (Fagaceae)

Pollen flow from external sources is important for the conservation of tree species in fragmented forests or small populations, because it can be sufficient to prevent differentiation among them, and appears to be able to prevent the loss of their genetic diversity through genetic drift. In this study, we examined the genetic heterogeneity of pollen pools accepted by each Quercus semiserrata seed parent at the Khun Wang Royal Agriculture Research Center, Thailand, both within and among two mast fruiting years (2005 and 2007), using paternity analysis and analysis of molecular variance (AMOVA). The mating systems of the trees were also examined using the multilocus mating system model (MLTR), after determining the genotypes at eight microsatellite loci of 26 seed-trees and 435 seeds from 8 seed-trees in the 2 mast fruiting years. The average distance of effective pollen flow within the plot was estimated to be 52.4 m, and 95% of effective pollen was dispersed within 200 m, indicating that effective pollen flow is highly localized and that most effective pollen is contributed by near-neighbor trees. The proportion of effective pollen that immigrated from external sources was estimated to be 26.2%. The AMOVA analysis based on the pollen haplotypes showed that the pollen pools, both total and for each reproductive year, significantly genetically differed among the seed parents. Using a mixed mating model, the estimate of biparental inbreeding for the total population (t_m − t_s) was 0.013, indicating that a low proportion of mating occurred among close relatives. The effective number of pollen donors (N_ep) was estimated to be 9.987 using the TwoGener model, or 10.989 using the mixed mating model. The effective number of pollen donors of seeds was higher in the mast fruiting year 2005 than in the other examined year, 2007. Consequently the allelic richness and genetic diversity of seeds produced in 2005 were higher than those produced in 2007. Overall, the results show that high outcrossing rates, high levels of gene flow from other populations and heterogeneity in the pollen received by an individual may enhance the ability of populations to maintain effective population sizes. Therefore, these processes may be sufficient to prevent loss of genetic diversity through genetic drift of Q. semiserrata at this study site.     

神农架地区珍稀植物沿河岸带的分布格局(英文)

在神农架香溪河流域内不同海拔高度沿河岸带共设置42个与河岸方向相同的10 m宽、100 m长样带进行植被调查,发现河岸带分布有珍稀保护植物14种,占神农架地区珍稀植物总数的42.4%,这些珍稀植物主要分布在1200～1800 m山地常绿阔叶林、落叶阔叶混交林带,表明在神农架地区植物群落的物种多样性在中等海拔高度上最大。TWINSPAN分类可把14种珍稀物种可划分为低海拔、中等海拔和较高海拔种组3组,DCA排序也使14种珍稀物种在反映海拔梯度的第一轴可以得到很好的展示。本文还对河岸带珍稀植物分布格局的成因进行了探讨,明确指出应重视河岸带在珍稀物种保护方面的重要作用。图3表1参9。     

秃极种质资源迁地保存栽培技术的研究

通过江苏省10年来秃杉种质资源迁地保存利用及相关栽培技术的研究结果表明，在江苏成功引种需采用“选择山洼、北坡或大型河堤有侧方林带庇荫的土层深厚、疏松、湿润的立地条件，用健壮2年生裸根苗或容器苗或带土苗于2月中旬至3月上旬栽植，实行针阔混交侧方遮荫或疏林复层混交遮荫，林地间作豆类等作物覆盖保湿，年生长速生期前（5月中旬-6月中旬）增施氮肥或氮钾复合肥，促进生长”等综合栽培技术。文内还结合引种保存区的自然条件和应用目的，提出了适合苏南低山丘陵山地、自然保护区、森林公园、苏北平原大型河堤，以及城镇绿化的多种栽植模式。     

濒危植物油杉种群生命表与生存分析

通过调查福州市长乐区珍稀植物油杉(Keteleeria fortunei(Murr.)Carr)种群,探讨其种群生命表和生存曲线,研究油杉种群数量动态变化。结果表明:长乐市油杉种群中树个体数最多,大树其次,幼树最少。油杉种群存活曲线为凹型曲线,属DeeveyⅢ型,表现为衰退型种群。油杉种群的个体死亡率和种群消失率曲线变化趋势相似,表现为油杉种群早期死亡率较高,生长到Ⅵ龄级时,其种群死亡率呈现逐步下降趋势。油杉种群生存函数曲线表现出该种群前期数量锐减、中期种群稳定和后期种群出现衰退的特征。