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Search Results: 1 - 10 of 65903 matches for " 吕世安 "
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金塔绿洲大气边界层特征的数值模拟研究
兴琴,
高原气象 , 2004,
Abstract: 利用美国NCAR中心的天气研究与预报模式WRF(WeatherResearchandForecastModel),对金塔绿洲的环流场、温度场及湿度场结构及其日变化进行了较为全面细致的模拟研究,WRF模式很好地模拟出了绿洲-沙漠环流的日变化特征和这种局地热力环流的空间结构,模拟再现了绿洲"冷岛效应"和邻近绿洲的沙漠"逆湿"等边界层特征,模拟还发现了白天绿洲湿度场"凹型槽"式分布的特征。
A systematic study on the trib. Polygonateae (Liliaceae s. l.) with reference to the evidence from leaf abaxial epidermis and seed coat
叶表皮及种皮特征在黄精族系统学研究中的应用

海亮,,杨继,饶广远
中国科学院研究生院学报 , 2000,
Abstract: The morphological features of leaf abaxial epidermis and micromorphological features of testa were observed in the tribe Polygonateae(Liliaceae, s. l. ). Seventy nine species from 7 genera of Polygonateae and 15 species from 12 genera of related tribes were examined with light microscope and SEM. In Polygonateae, the features of leaf and seed coat showed diversity in the genera Polyg- onatum and Smilacina. According to the characteristics of the leaf abaxial epidermis and seed coat, Polygonatum could be roughly categorized as two groups. One was characterized by the irregular shape and the sinuate anticlinal wall of epidermal cells and the shallow pits on the testa, the other was characterized by the rectangular or rhombic shape and the straight anticlinal wall of epidermal cells and the ridge and reseau on the seed coat. In some plants of the two groups, the anticlinal wall of epidermal cells was found to be curved rather than sinuate, and might be of an intermediate na- ture. The leaf epidermis and seed coat showed common features among Disporopsis, Smilacina and Polygonatum. The seed coat of Maianthemum was found to be of the same features as that of Smi- lacina stellata and S. trifolia. Disporum possessed uniform leaf epidermical features, but the spe- cies distributed in eastern Asia showed different features of seed coat from those in North America. The features of leaf epidermis and seed coat were uniform within the genus Streptopus. S. ovalis was indistinguishable from other species in the genus in the features of leaf epidermis and testa, thus its position in the genus was confirmed. Streptopus, Disporum and Clintonia were quite different from the remaining genera in the Polygonateae in the features of leaf epideimis and testa. The first two genera showed resemblance to Tricyrtis and Uvularia of Uvulariaceae, and thus Dahlgren's viewpoint that they should be moved to Uvulariaceae was corroborated. Among the outgroups stud-ied, only Convallaria showed similarity to Polygonatae in the features of leaf epidermis and testa.
兰州市冬季SO2大气环境容量研究
兴琴,陈玉春,
高原气象 , 2004,
Abstract: 通过数值模拟方法,研究了兰州市冬季SO2的大气环境容量,为大气污染的总量控制方法提供了前提和依据。本文利用RAMS三维非流体静力大气动力模式模拟的气象场驱动中尺度大气扩散模式(HYPACT),模拟出SO2的浓度分布及每个污染单元对于地面浓度的分担率。根据SO2的国家环境空气质量标准(下称质量标准),用线性规划的原理和方法计算了兰州市冬季典型日条件下SO2的大气环境容量。
河西绿洲效应的数值模拟研究
兴琴,,陈玉春
高原气象 , 2004,
Abstract: 利用MM5V3.6模式,设计了一组河西绿洲存在的控制试验和绿洲变为荒漠的"去绿洲"试验;模拟分析了剔除现有绿洲影响下,背景场的环流、温度及湿度情况,同时对比分析了绿洲存在状况下,环流场及温度、湿度场的特征。通过两者的对比分析,更加清晰地再现了河西绿洲效应的特点。
鄂西南两个自然保护区亚热带常绿落叶阔叶混交林类型及其常绿和落叶物种组成结构分析
黄永涛, 姚兰, 艾训儒, , 丁易
植物生态学报 植物生态学报 , 2015, DOI: 10.17521/cjpe.2015.0096
Abstract: ?为深入研究亚热带常绿落叶阔叶混交林的生物多样性维持机制,合理保护与利用此类森林植被,以鄂西南两个自然保护区——星斗山和木林子典型的亚热带常绿落叶阔叶混交林为研究对象,在野外样方调查的基础上进行了群落数量分类和排序,分析了常绿和落叶物种比例随群落类型及环境因子变化的规律。研究结果表明:(1)将鄂西南两个自然保护区的亚热带常绿落叶阔叶混交林划分为5个群落类型:即青冈-翅柃+尖连蕊茶(Cyclobalanopsisglauca-Euryaalata+Camelliacuspidata)群落(I)、川陕鹅耳枥+青冈-翅柃(Carpinusfargesiana+Cyclobalanopsisglauca-Euryaalata)群落(II)、川陕鹅耳枥+青冈-水马桑(Carpinusfargesiana+Cyclobalanopsisglauca-Weigelajaponica)群落(III)、光叶水青冈+多脉青冈-翅柃(Faguslucida+Cyclobalanopsismultinervis-Euryaalata)群落(IV)和川陕鹅耳枥+交让木+包果柯-翅柃(Carpinusfargesiana+Daphniphyllummacropodum+Lithocarpuscleistocarpus-Euryaalata)群落(V);(2)常绿和落叶物种的丰富度、多度、胸高断面积及重要值等指标随群落类型而变化。在群落II、III和V中落叶物种占优势,而在群落I和IV中二者无显著差异;(3)各类型群落在小径级(1–5cm)内落叶物种的丰富度大于常绿物种,但多度、胸高断面积和重要值大都小于常绿物种。在中径级(5–10cm)内,群落I和群落IV的各项指标都表现为常绿物种大于落叶物种,而群落II、群落III和群落V的则相反。在大径级(≥10cm)内,各群落类型的落叶物种都占显著优势,其各项指标大于常绿物种;(4)海拔、坡度、坡向、土壤氮含量和土壤磷含量是影响各群落类型内常绿和落叶物种比例变化的主导因子。
山峰加热效应的数值试验研究
兴琴,胡隐樵,,左洪超
高原气象 , 2008,
Abstract: 已有的资料分析和理论研究表明,山峰加热效应是形成冬季兰州市白天脱地逆温的主要原因。本文利用中尺度数值模式MM5,从数值试验角度研究了兰州市白天温度场和环流场的结构特征。模拟结果表明:冬季,白天日出后的皋兰山峰相对于周围空气是一个热源,在环流场的配合下,皋兰山峰的暖空气向市区上空输送,与河谷温度较低的冷空气形成了白天的脱地逆温;理想"削山"试验的结果表明,山峰海拔越高的山体,加热效应越明显,山谷城市的大气逆温强度和稳定度随着山峰海拔高度的降低而减小。数值试验结果进一步验证和补充了观测和理论分析的结论。
Models-3空气质量模式对兰州市污染物输送的模拟
兴琴,左洪超,,朱彤
高原气象 , 2005,
Abstract: 较详细地介绍了美国环保总局的第三代空气质量模式系统Models-3的特点,并且针对兰州市冬季采暖期污染严重的特点,选取2002年12月份的个例,将兰州市最新的大气污染源资料加入模式中,对模式进行调试并检验了该模式对兰州污染的模拟性能。从模式对SO2,NO2和O3等几种大气污染物浓度的模拟结果与监测资料对比分析,表明该模式系统较好地模拟出了SO2,NO2的空间分布格局,模拟结果与监测结果比较吻合,而且模式模拟的污染物浓度场比较均匀;模式模拟的O3的日变化规律与资料分析结论基本一致,也符合O3的生成机理。因此该模式系统对于复杂地形条件下的城市污染物输送具有一定的模拟能力。
魔芋新品种———清江花魔芋
刘金龙,李维群,,盛德贤,李求文
园艺学报 , 2004,
Abstract: ‘清江花魔芋’是恩施州魔芋研究中心从武陵山区地方魔芋种质资源中通过系统选择育成,产量324115kg/hm2,干魔芋含葡甘露聚糖5114%,鲜魔芋含干物质1714%,全生育期125d左右,较抗白绢病和抗软腐病,比目前主栽品种增产10212%,成为了恩施州及武陵山区魔芋产业发展的主导品种。
山东贯叶连翘挥发油成分分析
英刚,,吴敏菊,张金荣,杜媛媛
中国中医药信息杂志 , 2007,
Abstract: 目的研究山东产贯叶连翘挥发性化学成分。方法采用超临界co2萃取法提取贯叶连翘全草挥发油,并通过气相色谱-质谱-计算机联用技术测定提取物的化学成分。结果从贯叶连翘挥发油中鉴定了47种化合物,其氧化石竹烯、斯巴醇、环十二烷、月桂酸等化合物为贯叶连翘挥发油的主要成分。结论山东产贯叶连翘挥发油成分与文献报道的其它地区产贯叶连翘挥发油成分有很大不同,说明地域和气候环境对植物的成分组成有很大的影响。
Molecular systematic studies on the tribe Polygonateae (s.l.) in China based on RFLPs data of PCR-amplified chloroplast DNA fragments
叶绿体DNA片段的RFLP分析在黄精族系统学研究中的应用

,海亮,杨继,饶广远,尤瑞麟,葛颂,钟扬
植物分类学报 , 2000,
Abstract: WT5BZ]Phylogenetic relationships in the tribe Polygonateae s.l. of Liliaceae were investigated with an RFLP analysis of two PCR amplified chloroplast genome DNA fragments. One fragment is the transfer RNA gene for lysine(trnK gene) including the maturase encoding gene matK, and the other is the rpl16 gene which codes for a chloroplast ribosomal protein in large subunit. The trnK gene is ca. 2600 bp in length in all the taxa, but the rpl16 gene ranges from ca. 1140 bp to ca. 1320 bp in length among different genera and in Polygonatum. The results suggested that the tribe Polygonateae s. str. consisting of Polygonatum, Disporopsis, Smilacina and Maianthemum is closely related to Convallaria in Convallarieae, and supported the earlier results that Streptopus and Disporum should be removed out from the tribe Polygonateae s.l.. The results also showed that Polygonatum formed a clad with Disporopsis, while Smilacina lumped with Maianthemum in the tribe Polygonateae s. str.. In addition, the present study supports the view that S. ginfoshanicum should be transferred from Smilacina to Polygonatum. WT5HZ]
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