树种

These suggest that Pinus massoniana, the pioneer species at early succession stage of forest community, is the plant species adapted to high light intensity, while Cryptocarya concinna, a species at succession climax stage has an advantage in light utility under low light environment.

这说明群落早期演替的先锋树种马尾松属于强阳生性树种，具有适应强光的特点，而处于群落演替项级阶段的优势种黄果厚壳梓则能更加充分利用低光生长环境中的光强，同时也可通过提高电子流向光呼吸分配的比例来避免自然光环境中强光的伤害。

Taking the seedlings of Dodonaea viscosa, Leucaena leucophala and Tephrosia candida as experimental materials, through drought stress treatment on pot seedlings with watering treatment group as control, the changes of leaf relative water content, relative plasma membrane permeability and proline content under drought stress were studied.

以金沙江干热河谷主要造林树种坡柳、银合欢和山毛豆的苗木为实验材料，通过盆栽苗自然干旱胁迫，同时以浇水处理为对照，探讨了干旱胁迫下3树种苗木叶片的相对含水量、质膜透性以及脯氨酸含量的变化情况。

Taking seedlings of Dodonaea viscosa, Leucaena leucocephala and Tephrosia candida from Jin Sha River as materials, the effects of drought stress on their lipid peroxidation and activity of defense enzymes under natural drought stress were studied in contrast to effects under watering.

以金沙江干热河谷主要树种坡柳、银合欢、山毛豆实生幼苗为材料，通过盆栽苗自然干旱胁迫，同时以浇水处理为对照，研究了干旱胁迫对坡柳、银合欢、山毛豆3个树种丙二醛含量、膜相对透性及保护酶活性的影响。

Seedlings operating more than 800 species, mainly breeding necessary to promote various types of garden landscaping to protect two species of the country, and a variety of new Coleus excellent tree species, street trees, flowering shrubs, trees, color categories, Hedge category, ornamental bamboo , flowers, bonsai category, flower category Lei, Flacourtia category by category, type of lawn, flower holiday, such as a total of 23 major categories of nursery stock range and constantly introduce new varieties and products to adapt to many northern and western climate cold, nicotinic soil, soil drought and other adverse natural environment, so best-selling nursery stock throughout the country, such as Beijing, Shanghai, Anhui, Guangdong, Hebei, Shandong, Ningxia, Gansu, Qinghai, Shaanxi, Shanxi, Sichuan, Inner Mongolia, Dalian, Heilongjiang and other places.

经营苗木品种达800余个，主要繁育推广各类园林造景必需的国家二级保护树种，以及各类新优彩叶树种、行道树、花灌木、乔木、色块类、绿篱类、观赏竹类、花卉盆景类、花篱类、刺篱类、地被类、草坪类、节日草花等共达23大类，苗木品种齐全且不断推出新品种，产品多适应北方、西部气候寒冷、烟碱性土壤，土质干旱等恶劣的自然环境，所以苗木畅销全国各地，如北京、上海、安徽、广东、河北、山东、宁夏、甘肃，青海，陕西，山西，四川，内蒙，大连，黑龙江等地。

The nutrient status in the rhizosphere sol of the Pinus koraiensis and Fraxinus mandshurica changed after they mixed in comparison to their pure plantations.

红松与水曲柳形成混交林后，通过两树种的相互作用使两树种根际土壤的养分状况较其各自纯林均发生了不同的变化。

Populus alba × berolinensis, Salix babylonica and Quercus mongolica mainly emitted isoprene; Pinus tabulaeformis mainly emitted α-pinene; Ulmus pumila, Gleditsia japonica and Syringa oblate mainly emitted limonene; Ligustrum obtusifolium mainly emitted isoprene, limonene and α-pinene at different time. The highest emission rates were observed for Populus alba × berolinensis and Salix babylonica.

不同树种排放的BVOCs组成明显不同，银中杨、垂柳和蒙古栎以排放异戊二烯为主；油松主要释放α－蒎烯；榆树、皂角和丁香以释放柠檬烯为主；水腊在不同时段其BVOCs组成情况变化较大，主要释放异戊二烯、柠檬烯和α－蒎烯；其中银中杨和垂柳的BVOCs释放量明显高于其它树种。

For transpiration Illicium arborescens was lowest all the time, but it could maintain a higher water-use efficiency than other study species such as Gordonia axillaris.

红花八角的蒸散作用率低於其它三种树种，但红花八角和大头茶一样，皆能维持较其它二种树种为高的用水效率。

Economic benefits for developing valuable hardwood species were also calculated taking Castanopsis hystrix as example. And the priority in the fields of research on large-size timber plantation forestry of valuable hardwood species has been pointed out.

本文以红椎为例，对经营珍优乡土阔叶树种的经济效益进行了概算，并提出了珍优阔叶树种大径材培育的未来优先研究方向。

Pterocarya stenoptera, belonging to the Juglandaceae family, is one of the mainlycultivated tree species in the middle and lower reaches of the Changjiang River in China,as well as an important native tree in Hubei province characterized with fast growth andstrong adaptabilities.

枫杨属胡桃科枫杨属，生长迅速、适应性强，是我国长江中下游主要栽培的树种之一，也是湖北省重要的乡土树种。

The result shows that the influence of tree species on the fundamental frequency of a soundboard is obvious. Among several tree species studied, the fundamental frequency of a ochroma lagopus soundboard is the highest, and that of a walnut soundboard is the lowest.

结果表明：不同的树种对钢琴音板基频的影响是明显可见的，在所研究的几个常用树种中，轻木音板的基频最大，而核桃木音板基频最小。

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。