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sand plants
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     The Main Indexes and Analysis Methods of Drought Resistant Comparison on Sand Plants
     沙生植物抗旱性比较的主要指标及分析方法
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     This paper focused on studing the six sand plants of genus Artemisia L.--A. halodendron Turcz. ex Bess.
     差不嘎蒿(A.halodendron Turcz.ex Bess.)
短句来源
     The mechanism of soil water used for sand plants could be demonstrated by the following two aspects:the physiological and ecological processes and biomass of ground parts of sand plants,distribution of root system of sand plants and soil water environmental capacity.
     沙生植物的水分利用的机制主要体现在如下两个方面 :地上部分的生理生态过程和生物量 :地下部分根系分布及其土壤水环境容量。
短句来源
     Studies on Kinships, Geographical Replacement Law and Reasons of the Six Sand Plants of Artemisia in Northern China
     中国北方六种沙蒿亲缘关系、替代分布规律与成因的研究
短句来源
     The six sand plants were researched in the following aspects: morphological observation, DNA analysis, distribution and adaptive evolution with environment. The results were as follows.
     本文从形态、DNA、分布到与环境的适应性进化,对六种沙蒿进行研究,结果如下:
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     On Sand
     论砂
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     Pearlite Sand Vacuum Dry Plants
     珠光砂真空干燥装置
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     The Influence of Moisture on Sand Vanguard Plants Growth
     水分对沙生先锋植物生长的影响
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     Phytochromes in plants
     植物中的光敏色素
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     CUSION PLANTS
     垫状植物
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Euphrates poplar(Populus euphratica Oliv.) is the only tree in desert zones in China. It is playing an important role in safeguarding the balance of ecosystem, providing timber, fire wood and fodder.As the euphrates poplar forest decreased greatly, the ecological conditions in many zones has worsened.That is why conserving, recovering and developing the forest is an urgent matter.Correct definiting the soil conditions is the foundation for carrying out this task.This paper indicates that euphrates poplar resists...

Euphrates poplar(Populus euphratica Oliv.) is the only tree in desert zones in China. It is playing an important role in safeguarding the balance of ecosystem, providing timber, fire wood and fodder.As the euphrates poplar forest decreased greatly, the ecological conditions in many zones has worsened.That is why conserving, recovering and developing the forest is an urgent matter.Correct definiting the soil conditions is the foundation for carrying out this task.This paper indicates that euphrates poplar resists arid and waterlogging but neither a xerophyte nor a marsh plant; salt-toleranted but not a halophyte; wind and sand combated but not a sand plant.The recovery and development of euphrates poplar forest must be according to the conditions of soil moisture and salt content, and then take appropriate measures, such as closed forest, regenerated forest under sprout and pollarding, forest from farmlands, irrigated forest by flood and planting seedlings.It may be the major species for sheltbelt establishment in irrigated salt-alkali farmlands in arid zones.

胡杨是我国荒漠地区唯一的乔木树种,在维护干旱地区的生态平衡、提供用材、燃料和饲料等方面,都具有重要作用。由于胡杨林大面积减少,不少地区生态条件恶化,维护、恢复和发展胡杨林是当务之急,而正确评价其土壤条件是进行这一工作的基础。研究表明,胡杨抗旱但非旱生,耐涝但非沼生,耐盐但非盐生,抗风沙但非沙生(树种)。胡杨的恢复和发展要围绕土壤条件特别是水分和盐分条件因地制宜地采取相应的措施,如封滩育林、挖桩更新、断根萌蘖、头木作业、退耕还林、引洪灌溉和人工造林等。胡杨抗盐耐涝还可作为干旱地区盐碱地护田林的主要造林树种。

Species composition, distribution and plant community of coastal higher plant in Xiamen and its adjacent areas has been studied. 325 species of higher plants belongin to 228 genera in 79 families were identified. Among them, 43 species are sand and saline plants. On the basis of the varous substratum of coast, higher plants in the survey area may be divided into four ecological groups as follows: (1) sand plant; (2) saline plant; (3) rock plant; (4) eurylope...

Species composition, distribution and plant community of coastal higher plant in Xiamen and its adjacent areas has been studied. 325 species of higher plants belongin to 228 genera in 79 families were identified. Among them, 43 species are sand and saline plants. On the basis of the varous substratum of coast, higher plants in the survey area may be divided into four ecological groups as follows: (1) sand plant; (2) saline plant; (3) rock plant; (4) eurylope plant. 15 major plant communities were observed in the area, such as Oenothera littoralis community, Mangrove community and Scaevola sericea community etc.

本文研究了厦门及其邻区海岸高等植物的种类组成、分布规律和植物群落概貌。鉴定了该区海岸高等植物325种,隶属于228属79科,其中沙生和盐生植物有43种。据海岸基质类型的不同,可分为沙生、盐生、基岩和广生境4个生态类群。有15个主要植物群落,如海边月见菜、红树林、草海桐群落等。

eveloping tendency of self-curing resin sand plant and technology as well as application of slip flask moldingof resin sand domestic and abroad are introduced.Costruction features of four conventional sets have been given and applicability and rule of selecting variety of those equipment put forth。

介绍了树脂自硬砂工艺和设备的发展方向及树脂砂脱箱造型国内外应用简况。介绍了国为外常用四种型式的树脂砂再生设备的结构特点,提出了各种树脂自硬砂设备的适用性和选用原则。

 
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