Since artificial pick forthe seed of Korean pine and Pinus pumila, Larix gmnelini, cutting down confivorous tree inlarge quantities to cause seed of food resource plenty of decreasing. In autumn because ofthe decreasing of food resource, squirrel coaching behavior also relatively decrease.7Redsquirrel digests rate existent seasonal discrepancy.
由于人为对红松种子、偃松种子的大量采集以及对其它针叶林的乱采滥伐，致使种子类食物资源大量减少，秋季由于食物资源的减少，松鼠的贮食行为也相对采食行为而减少。7松鼠消化率存在季节性差异。
Seed scales ± recurved at margin distally; 1st-year branchlets glaucous
上部的种鳞多少下弯的在边缘；第1 年的小枝有白霜 11 Larix kaempferi 日本落叶松
Regular forest felling was beneficial for the geneneration and the growth of young trees in Larix gmelinii forest. We could not only get direct economic benefits through forest felling but also maintain some ecological benefits.
一定强度的采伐有利于兴安落叶松林的更新和幼苗、幼树的生＼一长，从而既得到了直接的经济效益，同时又可以保持一定的生态效益。
Main conclusions from the study were as follows: Genetic variations among growth, stem-form and wood traits Variance analysis revealed that DBH, height and individual tree volume were significantly differed from 5 yr to 15 yr among Larix kaempferi families, and so were among individuals within a family, which mean that there was big potential either for individual selection or families selection and they were the major sources for its genetic improvement. Among families, there were very significant differences in the main-branch length, bark thickness, and holo-celouse; there were significant differences in the main-branch diameter, crown width, fresh-branch diameter, fresh-branch number, wood basic density, fiber length of early and late wood, wall/lumina of early and late wood; and there were significant differences in the 1% NaOH extract at 10% level as well.
本文以湖北省建始县15年生日本落叶松自由授粉家系子代测定林为对象，以纸浆材培育为目标，全面、系统地研究了日本落叶松家系生长、干形和材质性状的遗传变异规律，首次从数量遗传理论和生物数学两个方面探索了日本落叶松家系生长变异及遗传增益的预测，在常规育种逻辑方法应用方面，注重育种的效率和效益；建立了家系树高生长模型，分析了遗传参数随时间变化的动态趋势，并借助多性状选择指数首次为南方亚热带落叶松新引种区筛选出一批生长、干形和材质兼优的纸浆专用材家系和个体。
The content of NH3-N of Coniferous mixed forest is higher than rainfall and other forest. The content of NH3-N of Corylus cornuta marsh is lowest. The purgative effect of NH3-N of Larix gmelinii plantation is better too.
樟落混交林的氨氮含量明显高于大气降水和其它林分类型，榛子灌丛的氨氮含量最低，落叶松人工林对氨氮的净化效果也很好。
The investigation on the species and amount of the pest in burned forest in Heihe area showed the plantation of Pinus slyuestris var. mongolica and Larix gmelinii were easily attracted by Ips spp. and Anoplophora spp..
文章通过对黑河地区过火林地的虫害发生数量和种类的调查研究，表明樟子松和落叶松人工林在火烧后极易受到小蠹类和天牛类蛀干害虫的攻击。
Mongolica, soil acidity, humus component content, available K, total P, organic P, inorganic P, enzyme activity, and microbe amount of young stand olgensis of the second rotation of Larix olgensis in non-rhizosphere soil also increased, while soil physical properties deteriorated.
根际和非根际土壤交换性铝含量、胡敏酸组分，非根际土壤活性酸、有机质含量、腐殖质组成、15种氨基酸总量、各磷形态含量、三大土壤微生物数量、酶的活性和土壤容重增加。
Forest root-rot of Pimis koraiensis and Larix gmelinii is a kind of severely infective disease, which becomes more serious in seedyard.
落叶松、红松根朽病是危害严重的传染性病害，在种子园中发生尤为严重。
This study was performed by using dead branches and knot size analysis data of 50 sample trees in 10 sample plots for Larix olgensis Hengy plantations with different ages, different stand densi- ty and different sites.
以不同年龄、不同密度、不同立地条件的落叶松人工林作为研究对象，基于10块标准地中50株样木所获得的死枝和节子大小数据，利用数据统计分析模型和模拟技术，分析并研究了节子大小在树干上的分布规律，并构建了节子大小的预测模型。
In this study, six development periods duiring somatic embryo maturation of embryogenic cell line Y35 of Larix leptolepis×L.
本研究以杂种落叶松Larix leptolepis×L。
To study the molecular mechanism of Larix somatic embryogenesis, a differentially expressed cDNA library of Larix somatic embryo in the period of maturation was constructed using suppression subtractive hybridization. The cDNA from the cultures at the stage of somatic embryo maturation of embryogenic cell line Y35 of L. leptolepis ×L. principis-rupprechtii was used as the tester and the cDNA from its subcultured callus was used as the driver. Eight hundreds randomly selected positive clones were sequenced, and 468 UniGenes were obtained finally.
为研究落叶松体细胞胚胎发生的分子机理，文章以日本落叶松×华北落叶松杂种无性系胚性细胞系Y35体细胞胚成熟阶段培养物的cDNA为实验组，继代培养阶段胚性愈伤组织的cDNA为对照组，利用抑制性消减杂交技术(Suppression subtractive hybridization，SSH)构建了体细胞胚成熟阶段的差异表达基因文库。
To study the molecular mechanism of Larix somatic embryogenesis, a differentially expressed cDNA library of Larix somatic embryo in the period of maturation was constructed using suppression subtractive hybridization. The cDNA from the cultures at the stage of somatic embryo maturation of embryogenic cell line Y35 of L. leptolepis L. princi-pis-rupprechtii was used as the tester and the cDNA from its subcultured callus was used as the driver. Eight hundreds ran-domly selected positive clones were sequenced, and 468 UniGenes were obtained finally.
为研究落叶松体细胞胚胎发生的分子机理，文章以日本落叶松华北落叶松杂种无性系胚性细胞系Y35体细胞胚成熟阶段培养物的cDNA为实验组，继代培养阶段胚性愈伤组织的cDNA为对照组，利用抑制性消减杂交技术(Suppression subtractive hybridization，SSH)构建了体细胞胚成熟阶段的差异表达基因文库。
To study the molecular mechanism of Larix somatic embryogenesis, a differentially expressed cDNA library of Larix somatic embryo in the period of maturation was constructed using suppression subtractive hybridization. The cDNA from the cultures at the stage of somatic embryo maturation of embryogenic cell line Y35 of L. leptolepis × L. princi-pis-rupprechtii was used as the tester and the cDNA from its subcultured callus was used as the driver. Eight hundreds ran-domly selected positive clones were sequenced, and 468 UniGenes were obtained finally.
为研究落叶松体细胞胚胎发生的分子机理，文章以日本落叶松×华北落叶松杂种无性系胚性细胞系Y35体细胞胚成熟阶段培养物的cDNA为实验组，继代培养阶段胚性愈伤组织的cDNA为对照组，利用抑制性消减杂交技术(Suppression subtractive hybridization，SSH)构建了体细胞胚成熟阶段的差异表达基因文库。
Through the surveys of sample zone in the edges, being susceptible to cause forest fire, of the plantations of Larix principis-rupprechtii, the paper studied the distribution laws of the herb fuels, analyzed the edge directions and the pruning heights affect the herb fuels, and discussed the relations between dead herb loading and flame height in the edges.
该文通过对华北落叶松人工林易引发森林火灾的林缘地带进行的样带调查，研究林缘下草本可燃物的分布规律，分析不同方向林缘、不同修枝高度对林缘下枯草可燃物的影响，同时探讨枯草负荷量和火焰高度之间的关系。
Larix gmelinii forest ecosystem sequestered about 2.65 tons of carbon form the atmosphere per hectare per year and served as an important net carbon sink.
大气CO_2浓度倍增将使兴安落叶松林的净第一性生产力增加9.8%，并且提高了兴安落叶松林的碳汇功能。
The effects of different electro-conductively elements and resin spreading quantity on electromagnetic shield effectiveness and bond strength of Larix composite plywood was investigated.
分析了导电单元不同施加量以及涂胶量对木基复合材料电磁屏蔽效能和胶合强度的影响。
Around 30 ka, taiga of dominant Picea coexisted with Larix, Pinus and Abies was distributed in both islands under relatively colder and drier climate than at present.
两个岛上3万年前后以云杉与落叶松共生的森林为主，松和冷杉出现在比现代相对较冷和干的气候条件下。
Sample plots with different age of Larix olgensis forest in Changbai Mountain and small sample quadrates in every sample plot were set up.
在长白山林区不同龄级的落叶松林处设置样地，在样地上设置小样方。
Bracts obviously reflexed, obovate- or ovate-lanceolate, 5-7 mm at widest part; short branchlets slender, only bases of scales persistent
苞片明显反折，倒卵形披针形或卵形，在深裂宽的5-7毫米；短小枝纤细，鳞片的只是基部宿存 1 Larix griffithii 藏红杉
Stainless steel fiberand copper fiberare added to urea-formaldehyderes- in to make 3-layers Larix composite plywood with electromagnetic shielding effectiveness.
为了赋予木基复合材料电磁屏蔽功能，在脲醛树脂胶中加入不锈钢纤维和黄铜纤维导电单元，制备三层结构的落叶松复合胶合板，研究不同长度的导电单元以及涂胶量对木基复合材料电磁屏蔽性能和胶合强度的影响。