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Search Results: 1 - 10 of 71015 matches for " MA Rui-Jun "
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Photosynthetic characteristics comparison between an invasive plant, Lantana camara L., and associated species
入侵植物马缨丹(Lantana camara)及其伴生种的光合特性

ZHU Hui,MA Rui-Jun,
朱慧
,马瑞君

生态学报 , 2009,
Abstract: 马缨丹(Lantana camara L.)是粤东地区的入侵植物之一.采用LI-6400光合作用仪对马缨丹及其常见主要伴生种鬼针草(Bidens pilosa L.)、肖梵天花(Urena lobata L.)、土牛膝(Achyranthes aspera L.)在不同有效光合辐射(PAR)和不同CO2浓度下的光合生理指标进行测定,结果表明:(1)马缨丹的光饱和点(LSP)与光补偿点(LCP)分别为1225、13.58 μmol·m-2·s-1,均低于伴生种,且和伴生种差异达到显著水平,光饱和点时的最大净光合速率(Pmax)为13.89μmol·m-2·s-1,表观量子效率(AQY)为0 0503 μmol·m-2·s-1,与土牛膝相当,而显著高于肖梵天花;(2) 马缨丹的CO2饱和点(CSP)与CO2补偿点(CCP)分别为1350、61.78 μmol·mol -1,CO2饱和点时马缨丹的最大净光合速率(Pmax)为20.08 μmol·mol-1,显著高于土牛膝,马缨丹的表观羧化效率(CE)与鬼针草相当,为0.0424 μmol·mol -1;(3)有效光合辐射与CO2浓度的增加,对马缨丹气孔导度(Gs)、蒸腾速率(Tr)影响不明显,但大大提高了其水分利用率(WUE),提示马缨丹对于环境中光强和CO2的变化具有良好的适应能力.这些信息对马缨丹生理生态学特性的认识是一个补充,并能为马缨丹入侵机制的研究提供一些有价值的参考.
Impacts of environmental degradation on wild vertebrates in the Qinghai Lake drainage, China
青海湖流域环境退化对野生陆生脊椎动物的影响

MA Rui-Jun,JIANG Zhi-Gang,
马瑞俊
,蒋志刚

生态学报 , 2006,
Abstract: 随着全球气候变暖,野生动物的分布区、物候期,繁殖等都不同程度受到了气候变暖的影响.近年来,青海湖流域的气候也发生了变化.于2003~2005年对青海湖流域的生态环境与陆生野生脊椎动物及其生境进行了调查,结合查阅文献,运用地理信息系统方法,研究了青海湖流域的气候变化和陆生野生脊椎动物种类和分布的变化.发现青海湖流域的气候与自然环境都发生了变化,青海湖流域气温增幅较为显著,其中以秋、冬两季增温显著,20世纪末青海湖流域的平均气温较20世纪80年代上升了1.26℃.青海湖流域降雨量呈下降趋势,干燥度呈缓慢的上升趋势.1959年以来,青海湖的水位下降了3.7m,面积减少了313.3 km^2.1976年以来,湖东地区沙漠化土地面积从356.4 km^2增加到735.9 km^2.同时,沼泽面积从25.08km^2减少到4.73km^2.1949年以来,青海湖流域人口增长了近10倍,建立了由便道、省道、国道和铁路组成的路网,并建立了大面积的围栏草地.由于近代环境退化和人类活动的影响,青海湖流域的野生脊椎动物种类和分布的发生了很大变化.由于湿地面积减小,中国林蛙,花背蟾蜍和水禽的适宜生境变小.湖水退缩后,部分裸露的湖底演变为沙地,随着沙地面积的扩大,沙蜥的适宜生境面积扩大.在研究期间,湿地生境中观察到46种鸟类10种兽类,沙漠生境观察到3种鸟类和19种兽类,在高山草甸生境观察到63种鸟类和36种兽类.在居民地观察到鸟类、兽类分别为16种和6种.不同栖息地中啮齿动物种类差异显著,湖周沙漠啮齿动物种类最少,高山草甸啮齿动物种类最多.一些鸟类从青海湖地区消失了,大型兽类如藏羚(Pantholops hodgsoni)、藏野驴(Equus kiang)和野牦牛(Poephagus mutus)等从青海湖流域消失了,而普氏原羚(Procapra przewalskii)、藏原羚、原麝的数量显著减少.
Genetic Diversity of Ground Cover Plant Potentilla anserina L.
地被植物鹅绒委陵菜的遗传多样性研究

MA Rui-Jun,LU Jian-Ying,
马瑞君
,陆建英

植物科学学报 , 2010,
Abstract: 采用RAPD方法对不同海拔和植被盖度下的鹅绒委陵菜(Potentilla anserina L.)6个种群的遗传多样性水平进行了研究.结果表明,13条随机引物共扩增出132条带,多态性位点为117;鹅绒委陵菜物种水平的遗传多样性较高,且种群间分化明,多态位点比率(88.64%)、Nei ' s基因多样性(0.3180)、Shannon信息多样性指数(0.4732)均远高于多数克隆植物.6个种群内的遗传多样性水平变化较大,多态位点在各种群中分布不均衡,种群间分化系数(GST)为47.7%,基因流较低(Nm=0.5482),多态位点比率在31.06%~74.24%之间,Shannon信息指数在0.1711~0.3625之间,Nei基因多样性指数在0.1164~0.2425之间.多样性水平的变化与海拔没有明显的相关性,而与生境盖度呈显著正相关.从而推断在盖度低、资源丰富的环境中,该物种可能更倾向于克隆繁殖.
Anatomy of Gymnosperms Endemic to China, II. Taiwania flousiana Gaussen (Taxodiaceae)
中国特有裸子植物的解剖,II.秃杉

Hu Yu-Shi,Ma Rui-Jun,
胡玉熹
,马瑞君

中国科学院研究生院学报 , 1989,
Abstract: Taiwania Hayata contains two species: T.flousiana Gaussen and T. cryptomerioides Hayata, both endemic to China. T. flousiana was investigated with both light and scanning electron microscopes in respect to shoot apex, external and internal surfaces of leaf cuticle, primary leaf, juvenal and mature leaves, young stem, secondary phloem and wood of stem, etc, It is shown that the shoot apex consists of the following five regions: (1) the apical initials; (2) the protoderm, (3) the subapical moher cells;. (4) the peripheral meristem, and (5) the pith mother cells. The periclinal and anticlinal division of the apical initials takes place with approximately equal frequency. The juvenal leaf is nearly triangular or crescent-shaped in cross section and belongs to the leaf type II. The mature leaf is quadrangular in cross section (the leaf type I). There are a progressive series of changes in size and shape of the leaf cross section. The stoma of the ma- ture leaf is amphicyclic and occasionally tricyclic. The crystals in the juvenal leaf cuticle are more abundant than those in the mature leaf cuticle. The transfusion tissue conforms to the Cupressus type. The structure of juvenal leaf is the nearest to that in Cunninghamia unicana- liculata D. Y. Wang et H. L. Liu, while the mature leaf is similar to that of the Cryptomeria. Sclerenchymatous cells of the hypodermis in the young stem comprise simple layers and are arranged discontinuously. No primary fibers are found in the primary phloem. Medullary sheath is present between the primary xylem and the pith. There are some sclereids in the pith. The secondary phloem of the stem consists of regularly alternate tangential layers of cells in such a sequence: sieve cells, phloem parenchyma cells, sieve cells, phloem fibers, sieve cells. The phloem fiber may be divided into thick-walled and thin-walled phloem fiber. The cry- stals of calcium oxalate in the radial walls of sieve cells are abundant. Homogeneous phloem rays are uniseriate or partly biseriate, 1-48 (2-13) cells high, and of 26-31 strips per square mm. Growth rings of the wood in Taiwania are distinct. The bordered pits on the radial walls of early wood tracheids are usually uniseriate, occasionally paired and opposite pitting. Wood parenchyma is present, and its cells contain brown resin substances. Their end walls are smooth, lacking nodular thickenings. Wood rays are homogeneous. Cross-field pits are cupressoid. Resin canals are absent. Based on the anatomy of Taiwania and comparison with the other genera of Taxodiaceae, the authors consider the establishment of Taiwaniaceae not reasonable, but rather support the view that the genus is better placed between Cuninghamia and Arthrotaxis in Taxodiaceae.
Nano-Mechanical Properties and Nano-frictional Behaviors of Diamond-Like Carbon (DLC) Films Doped with Different Nitrogen Contents
掺氮类金刚石薄膜的纳米力学及纳米摩擦特性研究

ZHANG Rui-jun,MA Hong-tao,
张瑞军
,马洪涛

摩擦学学报 , 2005,
Abstract: 利用微波电子回旋共振化学气相沉积技术制备了不同氮掺杂量的类金刚石(DLC)薄膜,采用俄歇电子能谱仪、Raman光谱仪和Hysitron型纳米力学测试系统对掺氮类金刚石薄膜的化学成分和结构、纳米力学及其纳米摩擦特性进行研究.结果表明:反应气体中氮气流量比例越大,类金刚石薄膜中的氮含量越高;随着薄膜中氮含量增加,掺氮类金刚石薄膜中sp3比例下降,sp2比例明显增加,而薄膜的纳米力学性能如纳米硬度和弹性模量明显下降;纳米划擦试验中的划痕深度与薄膜中氮含量有关,当载荷相同时,氮含量越高,所对应的划痕深度越深;名义摩擦系数(LF/NF)随着载荷增加而增大;当载荷相同时,摩擦系数与沉积膜中的氮含量无关.
4-Methylanilinium nitrate
Rui-jun Xu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810005441
Abstract: In the crystal structure of the title compound, C7H10N+·NO3 , N—H...O hydrogen bonds involving the ammonium group and the nitrate O atoms result in the formation of zigzag chains propagating in [100].
4-Methylanilinium p-toluenesulfonate
Rui-jun Xu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810021537
Abstract: The crystal structure of the title compound, C7H10N+·C7H7O3S , displays strong N—H...O and N—H...S hydrogen bonding between the ammonium group and the p-toluenesulfonate anion, linking the cations and anions into chains along the b axis.
4-Methoxyanilinium iodide
Rui-jun Xu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047549
Abstract: The crystal structure of the title compound, C7H10NO+·I , displays N—H...I hydrogen bonds between the 4-methoxyanilinium cations and the iodide anion together with weaker C—H...π contacts.
4-Methylanilinium 3,5-dinitrobenzoate
Rui-jun Xu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810018441
Abstract: The crystal structure of the title compound, C7H10N+·C7H3N2O6 , displays N—H...O hydrogen bonding between the ammonium groups and the O atoms of the 3,5-dinitrobenzoate anions. Intermolecular C—H...O interactions further stabilize the packing. An O atom of each of the nitro groups is disordered over two sites with site occupancy factors of 0.59 (5) and 0.41 (6).
1,1′-{[1,1′-(Pyridinium-2,6-diyl)diethylidyne]diimino}diguanidinium pentachloridocadmate(II) monohydrate
Rui-jun Xu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809027196
Abstract: In the title organic–inorganic hybrid salt, (C11H20N9)[CdCl5]·H2O, the crystal structure is stabilized by intermolecular hydrogen bonds between the organic cation, the complex inorganic anion and the uncoordinated water molecule, forming a three-dimensional network.
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