树种

Common forest tree of the eastern United States and Canada; used especially for pulpwood .

美国东部和加拿大一种常见的森林树种；纸浆用树种。

That is to say,the cold resistance of these trees had raised by exercise in winter. The difference of the semilethal temperature of the trees at the beginning of Sept.2003 was slight(-5.03～-6.08℃).

试验结果表明，12 月底采样树种的半致死温度低于9 月初采样树种的半致死温度，即经过冬季一段时间的低温锻炼，植株的抗寒性有所增强。

The two tree water consumption characteristics, Populus simonii and Robinia pseudoacacie, and the interactions mechanism with environment factors were both studied at the level of leaf and singletree in terms of the modern technology of heat pulse sap flow and thermal dissipation sap flow probe. The two main purposes of study are to provide the science evidence in estimating the ecologic water consumption rules and to arrange better densities of the two tree species stand.

本文以北京市官厅库区水源涵养林的主要造林树种：小叶杨、刺槐为研究对象，采用当前国内外最先进的热脉冲式树干边材液流测定技术和热扩散式树干边材液流测定探针测定技术，从叶片和单株水平上探讨了刺槐和小叶杨的蒸腾耗水特性以及它们与环境因子之间的影响机理，其结果不仅可为更精确地估计生态用水定额提供科学依据，而且也可为该区域这两种树种的选择及其合理林分的密度起到一定的指导作用。

Was origin in east-south of USA, it is an excellent tree species because of strongly adjustability and growth fast in the nonage. Slash pine has planted 70 years in China; it is one of the most important tree species in the south China.

原产美国东南部，是一种前期生长迅速，适应性强的优良树种，中国引种栽培已有70a历史，是中国南方培育纸浆林、建筑用材林和采脂林的重要树种之一。

In comparison with slash pine, which was introduced earlier from abroad, and the native mason pine, the five-year-old loblolly pine families, which was introduced into Fujian Province, were evaluated.

火炬松原产美国东南部，是美国南方松类中极重要的速生建筑和纸浆用材树种，因其具备早期速生、适应性强等优良性状而被许多国家和地区广泛引种，作为工业原料林和用材林树种[1，2]。

There are more than 2,000 plant species, with 178 branches of higher plants, 611 genera and 1158 kinds, of which 73 tree species are 473 kinds of Section 181, accounting for 80% of tree species in Guangdong, mainland China, 25 kinds of state protection, accounting for 67 to 37% of the , there is a protected plant yew trees horses, Fujian cypress, Tsuga-bin, sightseeing wood, etc., and Guangdong-Song 207 kinds of medicinal plant resources; county's forest coverage reached 73.1% and the stumpage volume of 5.34 million cubic meters m.

植物种类有 2000多种，具有高等植物178科，611属，1158种，其中乔木树种73科181属473种，占广东大陆树种的80%，国家保护的25种，占全国67种的37%，有一级保护植物红豆杉、伯乐树、福建柏、长苞铁彬、观光木、广东松等以及药用植物资源207种；全县森林覆盖率达73.1%，活立木蓄积量达534万立方米。

An experiment was conducted to study in vitro shoot culture and micropropagation of Chinese tallow tree Sapium sebiferum

乌桕是一种经济价值较高的木本油料树种，其种子中的油脂可用于食用油源、工业油源和动力油源，是一种可再生能源培养的优良树种。

Leaf turgor loss point osmotic potential and saturation osmotic potential during the dry season were both significantly lower in all the three species, indicating a strong osmotic adjustment in adaptive to seasonal drought.

三树种叶片膨压丧失点的水势和饱和渗透势在旱季也均显著降低，表明三树种都通过较强的渗透调节来适应季节性的干旱。

For exploiting and making use of rhizobium species resources of planting leguminous trees in south China,the full_length 16S rDNA sequences of representative strains HJ06 and JJ06 of two rhizobia,isolated from Acacia crassicapa and A.cincinnata in south China,were determined.These sequences were compared with all known rhizobia and related bacteria and an unrooted phylogenetic tree was produced.

为了开发利用我国人工林豆科树种根瘤菌的种质资源，该研究对华南地区两个人工林豆科树种厚荚相思和卷荚相思的根瘤菌两个代表菌株HJ06和JJ06进行了16S rDNA全序列测定，将此全序列与根瘤菌各已知种及相关种的16S rDNA全序列进行了比较及聚类分析，得到系统发育树状图。

The Aesculus chinensis,Euptelea pleiospermum,Cercidiphyllum japonicum,Taxus chinensis,Picea brachytyla and Emmenopterys henryi Oliv compose and stand structure of were studied,and the comparability matrix among those main woods distribution were studied,and the protection propagation countermeasures were put forward.which are important for researching and protecting these rare woods in Fun...

经调查，基本摸清了国家保护植物七叶树林、领春木树林、连香树林、红豆杉树林、云杉树林、香果树林6种珍稀树种林分的组成与结构，研究了主要林分之间的相似性矩阵，同时提出了保护繁育对策，对开展研究和保护珍稀树种具有重要意义。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。