旱生植物

Mey Bunge is an important desert plant with the characteristics of good drought-resistance and salt-tolerance in northwest of China.

Mey Bunge是西北沙漠地区极为抗旱、耐盐的超旱生植物，在生态建设方面具有重要作用。

Results showed that all leaves consisted of epidermis, chlorenchyma, aquiferous tissue and vascular bundles. The leaves had the xeromorphic characteristics, including thickened epidermal cell wall, thickened cuticle, sunken stomata and well_developed aquiferous tissue. With the exception of this, there were remarkable differences in leaf structure among the six species.

结果表明，6种芦荟叶均由表皮、光合组织、储水组织和维管束组成，都表现出明显的旱生植物肉质叶的结构特征，表皮由一层扁平的细胞组成，其外壁加厚，并覆盖着厚的角质膜，气孔器凹陷，储水组织发达。

Kalanchoe; sunken or protected stomata e.g. marram grass; folding, rolling or repositioning of leaves to reduce sunlight absorption, e.g. marram grass; a dense covering of white reflective spines, e.g. cacti; and the development of a dense hairy leaf covering, e.g. Espeletia.

通过减少水分流失而生存的旱生植物的生存策略包括：落叶，如：墨西哥刺木；分泌蜡质覆盖叶片使气孔器被封闭或堵塞，如：滨草；折叠、卷曲或重新排列叶序而减少对日光的吸收，如：滨草；喜砂草盖白色的可以反射太阳光的刺，如：仙人掌；还可以发展出密毛状叶片铺满全身各处，如： Espeletia 。

Result:The stomatic density and characteristic of leaf epidermis and stem epidermis in six Ephedra species was differenc,there were no ob...

结果：6种麻黄属植物之间气孔密度、茎、叶表面特征存在不同程度的差异；气孔表现出典型旱生植物的特征，略下陷，气孔保卫细胞被厚的角质层覆盖，并形成突起状角质唇状物；气孔大小、形状在种之间无明显区别；叶表面、茎表面气孔均属于无规则型，但形状明显不同，前者主要呈长方形或六边形，后者为窄条形或哑铃形。

Result:The stomatic density and characteristic of leaf epidermis and stem epidermis in six Ephedra species was differenc,there were no obvious morphological differences in stoma shape and size.

结果：6种麻黄属植物之间气孔密度、茎、叶表面特征存在不同程度的差异；气孔表现出典型旱生植物的特征，略下陷，气孔保卫细胞被厚的角质层覆盖，并形成突起状角质唇状物；气孔大小、形状在种之间无明显区别；叶表面、茎表面气孔均属于无规则型，但形状明显不同，前者主要呈长方形或六边形，后者为窄条形或哑铃形。

The plants of the family Tamaricaceae, a family with long history, have occurred in ancient Mediterranean region since Tertiary. Most of them are drought-telerant plants, which are suitable to be used as wind-preventing, forest-making and soil-holding plants. Ecologically, they are plants of great importance in reforming of desert and improving of climate condition in arid zone.

柽柳科是一个古老的科，起源于第三纪，包括亚洲中部的内的&古地中海&沿岸地区，该科植物主要为旱生植物，其中大多数种是防风、固沙造林和水土保持的优良树种，对改造沙漠和改善气候条件具有重要的生态意义。

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 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。

Trigyna enhanced with season, being consistent with its growth rhythm. Comparing with other xerophytes, R. trigyna had very low (Ψ and (Ψ, presenting its strong ability of maintaining high osmotic pressure and low water potential.

说明长叶红砂在季节变化中历经了逆境锻炼，其耐水分亏缺能力随5、7、9月逐渐递增，这与植物的生长发育节律相吻合；与其他荒漠旱生植物相比，长叶红砂的Ψ(上标 sat 下标 s和Ψ(上标 tlp 下标 s值非常低，具有很强的忍耐高渗压和维持低水势的能力。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。