根冠

Whith the increase of water supply,the biomass,tree height,total branch number and length,total leaf number and area,specific leaf area and fine root length increased,and root/shoot biomass,sclerophyllous characters and leaf succulence degree decreased.

随着施水量的增加，幼苗生物量、株高、总枝数和长度、总叶片数、总叶面积、比叶面积和细根长逐渐增大，而生物量根冠比、硬叶特征和叶肉质化程度逐渐减小。

Treated with 3 kinds of cultivation medium s:peat,moss and soil,adaptability of Thalia dealbata,Pontederia cordata,Iris sanguinea and Hydrocotyle verticillata were compared.

结果表明：3种处理下，再力花、海寿花和轮叶石胡荽的植株地上部、地下部生物量均以地栽处理最高，植株根冠比均以地栽处理最低；溪荪在3种处理下的适应性没有表现出明显差异；4种植物在3个处理下的根系活跃吸收面积率变化趋势相似，基本在40%～50%波动，没有明显差异；4种植物在泥炭栽培和水苔藓栽培基质下都有一定的适应性。

There were so huge roots and rhizome system under ground that they could absorb water from deep soil; Stems and leaves on ground could decrease water loss. The huge biomes of G.uralensis had strong drought resistance superiority. In the same time, drought stress significantly restrained the growth of G.uralensis. On the contrary, in some extent, drought stress could improve the growth of roots under ground and resulted in increasing the rate of root/shoot; moreover, made the color of velamen become red and enhanced the output and the quality.

主要结论如下：(1)在形态与生长反应方面，观察发现甘草地下和地上两部分都具有适应干早环境的特征，地下有庞大的根和根茎系统，吸水能力很强，地上茎叶形态表现出很强的节水能力，并且甘草群体抗旱优势很强；同时也观测到干旱对甘草地上茎叶生长抑制较为明显，但在一定程度上对地下根系生长起到了促进作用，导致根冠比增大、根皮颜色变红，即在产量和质量方面都有了很大地提高。

Research on individual bamboo biomass and timber physical structure indicated that the allocation of Guadua amplexifolia biomass to branch is higher than moso-bamboo evidently. Root shoot ratio is larger than other sympodial bamboo, so it can be considered as a good breakwind plant because of developed root and branch. Every modularity biomass above ground had significant positive correlation with basal diameter and total height, it can simulated with allometric model. The culm had large relative wall thickness and low moisture content, so it can be cultivated as fine timber-used bamboo.

通过对Guadua amplexifolia现存单株生物量结构和竹材物理结构研究，结果表明：地上部分生物量在枝条上的分配比例高于相同径级毛竹，根冠比较其他丛生竹种大，具有发达的地下根系且易形成密集林分，是良好的防风植物材料；地上部分各器官生物量与地径、全高均呈显著的正相关，可以用相对生长模型进行模拟；竹秆有较大的相对壁厚和较低的含水率，可以作为良好的材用竹种进行培育。

Leaf water content and leaf relative water content of Bromus inermis, Festuca arundinacea, Bromus biebersteinii decreased lightly under severe water stress, while leaf relative electrical conductivity increased lightly. Moreover, the leaf soluble sugar increased significantly, plant height stress index and dry matter stress index were higher, root/shoot ratio had the trend of rise.

在重度水分胁迫下，无芒雀麦、苇状羊茅、草地雀麦叶片含水量和叶片相对含水量下降幅度较小，叶片相对电导率增加幅度较小，叶片可溶性糖含量上升幅度较高，株高胁迫指数和干物质胁迫指数也较高，根冠比保持上升趋势。

The promoting effect of elevated CO2 on biomass and R/S of Calamagrostis angustifolia was only significant in treatments higher in nitrogen supply, while it was not in CK.

在HN水平下，大气CO2浓度升高使小叶章生物量和根冠比明显增加，在NN条件下促进作用则不显著。

A field experiment using OTC(open-top chamber)was carried out with treatments different in nitrogen supply0, 5, 15 gm^(-2 and CO2 level 350 vs 700 μmolmol^(-1 to investigate effects of the treatments on biomass and root/shoot ratio of Calamagrostis angustifolia.

利用开顶箱薰气室(open-top chamber)试验装置，研究了不施氮、施常氮MN， 5gm^(-2和施高氮HN， 15gm^(-23个氮素水平下大气CO2浓度升高对小叶章生物量和根冠比的影响。

The study of the photosynthetic and growth indices versus stress intensities shows that Caryopteris mongholica Bunge strengthens its adaptation to water stress with the reduction of net photosynthetic rate, transpiration rate and Maximum quantum efficiency of PSⅡphotochemistry, and the weakening of biomass accumulation and growth rate that are accompanied with a better water use efficiency and an increased Root/Shoot Ratio, and that the provenance of Inner Mongolia TUZUOQI is of the best physiological indices in water deficit.

通过测定不同水分梯度、不同种源的光合生理与生长指标表明：蒙古莸通过降低光合效率、蒸腾速率和最大光化学效率，减缓生长和生物量积累，提高水分利用效率和根冠比来适应水分胁迫。在水分胁迫下，蒙古莸光合能力的下降是引起其生长减缓的重要原因。从蒙古莸光合能力与生长综合考虑，内蒙古土默特左旗种源是在水分胁迫下表现最优良的种源。

In this research, many indices of drought resistance during germination stage and seedling stage were chosed to evaluate comprehensively the drought resistance of 20 Dactylis glomerata L. germplasm from abroad.

以国外引进的20份野生鸭茅种质资源为研究材料，通过萌芽期PEG模拟干旱试验、幼苗期温室盆栽试验，系统测定了干旱胁迫下鸭茅种质萌芽期种子萌发抗旱指数、胚根、胚芽，幼苗期幼苗株高、根冠比、叶片水分饱和亏缺、质膜透性、脯氨酸含量等形态和生理指标，全面分析了这些指标的变化规律，对所引进的20份鸭茅种质的抗旱性进行了综合评价。

The morphological transition of the epithelial-mesenchymal compartment by serial transverse sections of the apical end toward the incisal direction is likely to reflect the development of the tooth germ in the prenatal stage.

此上皮突的根冠向连续横断面组织切片显示为上皮—间充质之间形态的转变，就如同胚胎时期牙胚的发育过程。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。