查询词典 Betula

In the aspect to improve the cold resistance of Betula alnoides Buch Ham seedling, apparent results are obtained with three pre-treatment methods( ABA、PP333、citric acid).

在提高西南桦苗木抗寒力措施方面，用ABA、PP333、柠檬酸预处理都取得了明显的效果。

Integrative analysis for the physiological factors and anatomical structure shows that, among the 12 provenances of Betula alnoides Buch Ham tested, K、D、G、B are those that are more cold-resistant, while F、A、C、K are the ones that are more hot-resistant.

对西南桦种源生理指标与解剖结构进行综合分析发现，所试12个种源中较抗寒为种源K、D、G、B；较抗热性的种源为F、A、、C、K。

Along with the Korean pine and broad-leaved climax forest succession (a 20 yr Populus davidiana and Betula platyphylla secondary forest, an 80 yr Populus davidiana and Betula platyphylla secondary forest and the Korean pine and broad-leaved climax forest), the peak production of fine root is in early summer and autumn.

在原始阔叶红松林的演替过程中（白桦山杨幼林—白桦山杨成熟林—阔叶红松林），细根生长的季节变化特征是生长顶峰出现在初夏和秋季。

From the high altitude to the low altitude, the forest type is the betula ermanii forest, the moss-betula ermanii dark-conifer forest, the dark-conifer forest, the moss-pinus koraiensis dark-conifer forest, and the Korean pine and broad-leaved climax forest.

长白山北坡主要原始森林生态系统由高海拔到低海拔分别为：岳桦林、苔藓岳桦暗针叶林、山地中部暗针叶林、苔藓红松暗针叶林、原始阔叶红松林。

In this paper, we determined the toxicity of transgenic Betula platyphylla with Bt spider peptide gene. Larvae of Lymantria dispar were feed on leaves of transgenic Betula platyphylla with Bt spider peptide gene, The mortality, reduced ratio of weight, ecdysis index and schedule time of every instar.

本文对转Bt C肽蜘蛛杀虫肽的白桦进行杀虫性测定，对取食对照和转基因植株舞毒蛾幼虫的死亡率、体重降低率、蜕皮指数、幼虫各龄级历期等指标进行了分析，证明外源基因已经成功插入白桦基因组中，并且能够表达杀虫蛋白。

Betula alnoides forests, grassy slopes, loose peaty soil with ferns, rocky moist places along streams, crevices of cliffs;

Betula alnoides森林，草坡，有蕨类植物松散的泥炭的土壤，岩石的潮湿的地方沿着溪，悬崖的裂缝的；1600-2600米。

Between shrub and herb layers ,the difference of each index was not significant The total richness index and Shannon-Wiener index of Phellodendron amurense plantation community were all the highest than those of the other communities.(2) The total richness index of Machilus pingii- Quercus oxyodon evergreen broad-leaved forest community, Alnus cremastogyne-Betula luminifera-Quercus oxyodon evergreen-deciduous broad-leaved forest community and Rhus potaninii- Juglans sigillata- Quercus oxyodon evergreen-deciduous broad-leaved forest community all exceeded 31 .These communities , the dominance species in their shrub layers is Fargesia rufa ,such as Betula luminifera-Rhus chinensis-Quercus oxyodon evergreen-deciduous broad-leaved forest community, Quercus oxyodon-Litsea pungens-Cornus macrophylla evergreen-deciduous broad-leaved forest community, Cornus macrophylla- Acer caudatum var.

2润楠-曼椆常绿阔叶林、桤木-亮叶桦-曼椆常绿落叶阔叶混交林、青麸杨-野核桃-曼椆常绿落叶阔叶混交林群落的总体丰富度指数均大于31；在灌木层以青川箭竹为主的群落(亮叶桦-盐肤木-曼椆常绿落叶阔叶混交林、曼椆-木姜子-梾木常绿落叶阔叶混交林、梾木-川滇长尾槭-落叶阔叶林、川西樱桃-尾叶樱-川滇长尾槭落叶阔叶林)中，各群落总体丰富度指数和Shannon-Wiener多样性指数较小，总体优势度指数较大；8种次生林群落灌木层丰富度指数均高于乔木层，乔-灌层间丰富度指数差异性检验达显著水平；乔-草层间的丰富度指数差异性检验达极显著水平，Shannon-Wiener多样性指数差异达显著水平；灌-草层间的多样性指数和优势度指数差异性检验均达显著水平。

The results showed that: with the regression analysis of Betula platyphylla, Pinus koraiensis, Abies nephrolepis, Picea koyamai var koraiensis, and Betula costata, there was a significant negative correlation between neighborhood interference index and the growth (0.40~0.89) and the correlation extent depended on the neighborhood influence zone and slope. The neighborhood influence zone corresponding to maximal regression coefficient R~2 was the neighborhood influence radius. Based on the linear subsection regression between neighborhood interference index and influence zone of five species, the neighborhood interference index increased with the increasing zone and there was a previous increasing trend in a certain scope, while the increasing trend slackened beyond the zone. The neighborhood influence zone corresponding to transition point was the neighborhood influence radius. The neighborhood interference index positively correlated with the neighborhood influence zone and the range of R~2 was 0.40-0.64. With the analysis of tree cores of Juglans mandshurica, Fraxinus mandshurica at middle and lower slope in a plot which was fostered in 1995, the distance which the growth release farthest neighborhood and object stub was judged, thus the neighborhood interference radius was inferred. According to the studies, we found that the neighborhood interference radius was different among different trees, even if the neighborhood interference radius of the identical tree species also had the difference at different slopes.

结果表明：通过对白桦、红松、冷杉、红皮云杉和枫桦树种进行邻体干扰指数与生长量回归分析发现，邻体干扰指数与生长量呈显著负相关(0.40～0.89)，相关程度因邻体影响范围和坡位而异，R~2达到最大值所对应的影响范围即为邻体影响半径；通过对白桦、红松、冷杉、红皮云杉和枫桦树种进行邻体干扰指数与影响范围的线性分段拟合，邻体干扰指数随影响范围的增加而增加，其在一定的范围内上升较快，而超出该范围后上升的幅度变慢，变化的转折点所对应的影n向范围可以判定为邻体影响半径，线性回归显著(0.40～0.64)；通过对1995a抚育的胡桃楸、水曲柳样树进行研究，分析邻体树种的中坡位和下坡位的生长锥芯，判断产生生长释放的最远邻木与基株树桩所对应的距离，推断邻体影响半径；根据研究发现，邻体影响半径因树种不同有一定的差异，即使同一树种的邻体影响半径在不同坡位也有一定的差异。

Salix matsudana, Ulmus pumila, Quermus mongolica, Populus alba×P.beroliensis and Betula platyphlla are frontal 5 tree species with weight value 90.37, 90.12, 88.12, 87.55 and 86.2 respectively, were used for farmland protection forest; Acer negundo, Salix matsudana, Juniperus rigida, Fraxinus mandshurica and Ulmus pumila are frontal 5 tree species with weight value 78.14, 76.92, 75.96, 74.72 and 74.56 respectively, were used for urban protection forest; Ulmus pumila, Salix matsudana, Populus alba×P.beroliensis, Acer negundo and Larix gemelinii are frontal 5 arbor tree species with weight value 80.07, 79.07, 77.5, 72.42 and 71.67 respectively, were used for road protection forest; Salix matsudana, Populus alba×P.beroliensis, Ulmus pumila, Larixgemelinii and Betula platyphlla are frontal 5 tree species with weight value 92.37, 88.72, 86.62, 85.82 and 85.7 respectively, were used for river protection forest; Fraxinus mandshurica, Larix gemelinii, Populus alba*P.beroliensis, Ulmus pumila and Salix matsudana are frontal 5 tree species with weight value 89.61, 8.35, 87.12, 85.56 and 80.15 respectively, were used for wood forest; Cornus alba, Prunus tomentosa, Primus triloba, Syringa obalata and Sambucus williamsii are frontal 5 shrubs with weight value 82.93, 81.23, 80.85, 78.38 and 77.78 respectively, were used for landscape forest; and Acer negundo,Malus baccata, Sorbus pohuashanensis, Prunus maackii and Prunus padus are frontal 5 arbors with weight value 82, 81.52, 80.3, 79.62 and 78.9 respectively, were used for landscape forest; Prunus salicina, Prunu

根据哈尔滨地区不同林种的功能要求，给出了不同指标的期望值，通过查询系统可以得到旱柳、榆树、蒙古栎、银中杨、白桦为符合农田防护林的前五位的树种，权重值分别为90.37、90.12、88.12、87.55、86.2；糖槭、旱柳、杜松、水曲柳、榆树为符合城市防护林的前五位的树种，权重值分别为78.14、76.92、75.96、74.72、74.56；榆树、早柳、银中杨、糖槭、兴安落叶松为符合道路防护林的前五位的乔木树种，权重值分别为80.07、79.07、77.5、72.42、71.67；旱柳、银中杨、榆树、兴安落叶松、白桦为符合河岸防护林的前五位的树种，权重值分别为92.37、88.72、86.62、85.82、85.7：水曲柳、兴安落叶松、银中杨、榆树、旱柳为符合用材林的前五位的树种，权重值分别为89.61、88.35、87.12、85.56、80.15；红瑞木、毛樱桃、榆叶梅、紫丁香、接骨木为符合风景林前五位的灌木树种，权重值分别为82.93、81.23、80.85、78.38、77.78，糖槭、山丁子、花楸、山桃稠李、稠李为符合风景林前五位的乔木树种，权重值分别为82、81.52、80.3、79.62、78.9；李、杏、文冠果、山楂、野梨为符合经济林的前五位的树种，权重值分别为88.85、80.88、73.25、69.35、63.77。

Two and half years after planting, Swietenia mahagoni and Betula alnoides formed the mixed stand structure, Betula alnoides and Swietenia mahagoni occupied the upper and lower layer respectively.

在幼林前期，两树种已经初步形成西南桦居上层、桃花心木居二层的复层结构。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了