旱

The physio-ecological characteristics of photosynthesis of the two extreme xerophytes were studied under natural environment.

在自然条件下研究了两种超旱生植物的光合生理生态日变化特征。

The annual and biennial herbs and xerophytes were dominant in every degraded stage of grassland, and played important roles in maintaining stability and ecological function of the community.

在退化的各个阶段，一、二年生和旱生植物在各个阶段始终保持着较高的优势地位，对群落生态功能的发挥和维持起着重要作用。

The major factors that impact the species composition in communities were: xerophytes invasion, the intensity of human activities and the water resources status of the wetland.

决定湿地群落中植物组成的主要因素是：旱生植物入侵、人为活动的干扰强度和湿地的水资源状况。

In some xerophytes, such as cacti, most of the leaves are modified into spines, greatly reducing the leaf area for transpiration; the photosynthetic function of the leaves is taken over by the green stems.

在一些旱生植物中，如仙人掌，大部分的叶片都特化为刺，极大的减少了叶片区域的蒸发作用，同时光合作用为绿色的茎所承担。

Xerophytes ; leaf structure ; ecological adaptation ; diversity

旱生植物；叶结构；生态适应；多样性

Anatomical observations of assimilating branches of nine xerophytes in Gansu.

标题 我国甘肃九种旱生植物同化枝的解剖观察。

Anatomical observations of assimilating branches of nine xerophytes in Gansu.

Title 我国甘肃九种旱生植物同化枝的解剖观察。

Species in Ceratoides are semi-shrub xerophytes distributed in arid and semi-arid area. They have great potentialities to ecological restoration and high value to being used as forage. However researches on their physiological characteristics related to drought adaptabilities were not sufficient, yet.

驼绒藜属植物为干旱、半干旱地区具有重要生态价值和饲用价值的旱生半灌木资源，对该属植物适应干旱生理特性的研究尚不充分，加深研究有助于提高对它们的利用效率和应用价值。

The results indicate that (1) with the increase of grazing intensities from light, middle, heavy to overgrazing, plant coverage and aboveground/belowground biomass decreases, the structure of plant community changes from simple to complexity and to simple, the type of plant community changes from mesophytes+xerophytes to xerophytes and to halophytes.

结果表明，随著放牧强度的增加，羊草草原的植被盖度和生物量随之降低，优势羊草群落将逐渐被盐生植物所替代，群落结构趋於简化，物种向旱生化和盐生化演替。

In many xerophytes and in some conifers of cooler climates, where soil water may be difficult to obtain in winter, the guard cells-and hence the stoma-are sunk in pits in the epidermis, often protected by hairs form passing air currents. TRANSPIRATION rates are thus greatly reduced, while allowing gaseous exchange for photosynthesis.

一些旱生植物和寒冷气候带的针叶树在冬季很难从土壤中得到水分，因此它们的保卫细胞和气孔在表皮上下陷成为气孔窝，常被表皮毛保护，可以在满足光合作用所需的气体交换的同时防止通过的气流带走大量水分，大大降低了植物呼吸率。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。