井冈山自然保护区栲树群落研究   总被引：1，自引：0，他引：1  

邓贤兰  黄彩霞  芦站根 《衡水学院学报》2005,7(1):15-17

以栲树群落8个样地调查资料为基础，对该群落的物种组成、区系成分和物种多样性进行了统计和分析，结果表明：栲树并落中有维管植物51科67属98种(含变种)；属的地理成分复杂，以热带成分为主，温带成分只占较少比例；乔木层、灌木层和草本层的各项物种多样性指标在群落各样地间均有一定的差异；在群落垂直结构中，灌木层的多样性指数最大，乔木层次之，草本层最小。  相似文献   

国家重点保护物种长柄双花木南岭群落植物区系与资源   总被引：2，自引：0，他引：2  

谢国文  谭巨清  曾宇鹏  谭逸思  周君  李海生 《广东教育学院学报》2010,(5):79-87

本文采用样方法对南岭地区长柄双花木4个种群进行了实地调查,对30个样方中长柄双花木群落的植物区系及其资源进行了研究.结果表明：长柄双花木南岭群落植物区系以亚热带分布的科属为主,并具有较典型的亚热带区系特点,有维管植物56科83属100种,其中蕨类植物8科10属11种,裸子植物2科2属2种,被子植物46科71属87种.资源分析结果表明有药用植物71种,用材植物19种,观赏植物18种,油脂植物17种,野果植物11种,芳香植物9种,淀粉植物6种,饲用植物4种,蜜源植物5种,纤维植物4种,有毒植物4种,蔬菜植物3种,说明长柄双花木南岭群落中野生经济植物资源丰富.  相似文献   

利用特色产业发展潢川旅游的对策研究     

郑波 《漯河职业技术学院学报》2012,11(5):64-66

旅游业强大的经济带动作用以及对经济发展的高贡献率使其日益成为热衷发展的新兴产业。潢川县近年来在特色产业发展中取得了可喜成绩,但其旅游业却未真正发展起来。所以,能否充分结合潢川的特色产业优势来发展旅游,则是后起的潢川旅游启动的有效途径。  相似文献   

Production of bacterial blight resistant lines from somatic hybridization between Oryza sativa L.and Oryza meyeriana L.     

严成其  钱凯先  薛刚平  吴忠长  陈跃磊  颜秋生  张雪琴  吴平 《浙江大学学报(A卷英文版)》2004,5(10)

Novel bacterial blight (BB) resistance gene(s) for rice was (were) introduced into a cultivated japonica rice variety Oryza sativa (cv. 8411), via somatic hybridization using the wild rice Oryza meyeriana as the donor of the resistance gene(s). Twenty-nine progenies of somatically hybridized plants were obtained. Seven somatically hybridized plants and their parents were used for AFLP (amplified fragment length polymorphism) analysis using 8 primer pairs. Results confirmed that these plants were somatic hybrids containing the characteristic bands of both parents. The morphology of the regenerated rice showed characters of both O. sativa and O. meyeriana. Two somatic hybrids showed highest BB resistance and the other 8 plants showed moderate resistance. The new germplasms with highest resistance have been used in the rice bfeeding program for the improvement of bacterial blight resistance.  相似文献   

武夷山自然保护区兰科植物及区系特点     

张玉  ;李灵  ;郭进辉  ;杨际信 《九江师专学报》2008,(6):61-63

武夷山自然保护区有兰科植物约39属82种,以热带属为主体、热带亚洲属分布为核心,以地生兰为优势,区系分布以热带属为主有向温带过渡的趋势。种的分布以热带亚洲至热带大洋洲分布最多,属种的地理成分多样,属内种贫乏。  相似文献   

铜鼓嶂产4种广东省新记录植物   总被引：3，自引：0，他引：3  

曾宪锋 《广东教育学院学报》2008,28(3):60-61

报道了采自梅州市丰顺县铜鼓嶂的4种广东省新记录植物．它们是菲律宾唐松草Thalictrum philip pinense C．B．Rob．,三叶木通Akebia trifoliate（Thunb．）Koidz．,壕（豪）猪刺Berberis julianae Schneid．和托柄拔葜Smilax discotis Warb．  相似文献   

肺癌患者不同舌苔类型菌群结构分析   总被引：1，自引：0，他引：1  

肖飞  周东蕊  徐征  丁以艳  杜彩贺  毛胜勇  吴承玉  陆祖宏 《南京晓庄学院学报》2010,26(6):4-7

中医舌苔类型是中医诊断重要组成部分,中医舌苔形成机制复杂,其中舌苔菌群结构是影响舌苔形成的重要影响因素.该项研究收集肺癌病人不同舌苔类型样本,采用变性梯度凝胶电泳技术进行分子生物学分析,结果发现相同舌苔类型的不同样本之间有较高的相似性,提示舌苔类型与菌群结构相关,分析与鉴定菌群的组成可促进中医诊断标准化.  相似文献   

Characteristics of faecal bacterial flora and volatile fatty acids in Min pig,Landrace pig,and Yorkshire pig     

《Electronic Journal of Biotechnology》2021

BackgroundIn order to study the influence of long-term growth process and evolution environment on intestinal bacteria of different breeds, the intestinal bacteria and volatile fatty acids among the faeces of Min, Landrace and Yorkshire pigs were analysed by Illumina high-throughput sequencing of the 16S-rDNA and gas chromatography.ResultsThe shared core microbiota of Landrace, Yorkshire and Min pig were 1273, accounting for 69.56% of total abundance of organisms. The proportion of Firmicutes in Min pig faeces (57.89%) was significantly higher than that in Landrace and Yorkshire pig faeces (47.01% and 46.40%, respectively) (P < 0.05), but that of Bacteroidetes was exactly opposite. Moreover, Min pig presented more highly efficient membrane transport, environmental adaptation, carbohydrate transport, and metabolism than Yorkshire pig (P < 0.05). The acetic acid/total volatile fatty acid ratio in Min pig was significantly higher than that in Landrace pig (P < 0.05), and the isobutyric acid/ total volatile fatty acid ratio in Min pig was significantly larger than that in Yorkshire pig (P < 0.05). Furthermore, the content of branched chain volatile fatty acids in Min pig was significantly higher than that in Yorkshire pig (P < 0.05).ConclusionsThis study demonstrated that Min pig, as an excellent breed in the cold area of China, possessed special intestinal floral structure compared to the imported pigs in order to satisfy their physiological and metabolic demands, which may influence their characteristics such as resistance to cold, diseases, and crude feeding, and the ability to deposit intramuscular fat.How to cite: Yang Y, Sun C, Li F, et al. Characteristics of faecal bacterial flora and volatile fatty acids in Min pig, Landrace pig, and Yorkshire pig. Electron J Biotechnol 2021;53. https://doi.org/10.1016/j.ejbt.2021.05.002  相似文献   

商丘种子植物区系分析     

李方远  王保业 《商丘师范学院学报》2002,18(5):99-101

商丘种子植物区系组成计117科，506属，854种，其中裸子植物所占比值偏低；木本植物占商丘总种数的31．5％；区系地理成分复杂，归15个分布区类型，其中以温带成分为主，热带成分比较丰富，与周围地区联系广泛并且有明显的过渡性，人类活动在一定程度上降低了本区植物区系的丰富程度并影响了其种类组成，但没有改变本区植物区系以温带成分为主这一根本性质。  相似文献   

试论浙江省森林植物区系   总被引：6，自引：0，他引：6  

王景祥 《中国科学院研究生院学报》1986,24(3):165-176

1.  History of development of the forest flora Since the Cenozoic period, the number of forest tree species has steadily  risen. In the course of time, some of the archaic types slowly diminished and perished, and new forms gradually evolved. During the palaeocene, the numher of the gymnospe- rms (with the exception of conifers) and ferns drastically decreased, and that of con- ifers, on the contrary, increased significantly, and meantime the broad-leaved tree spe- cies also appeared. During the Neocene, the angiosperms expanded rapidly and the ve- getation gradually shifted towards the mixed deciduous-evergreen forest. Shortly before the Quaternary, there was a series of world-wide climatic fluctuations, as illustrated by progress and retreat of glaciers, cold-resistant and warm-loving  (thermophilic)  plants appeared alternately.  In the post-glaciation period, the zonal distribution of forest ve- getation in Zhejiang Province was essentially similar to that of the present time. Exca- vations from Homu-tu, Yu-Yao County,  reveal a luxuriant subtropical forest which existed 7000 years ago.       2.  Characteristics of the flora and vegetation       (1)  Of ancient origin, with rich relic elements.       Archaic gymnosperms such as Ginkgo biloba, Amentotaxus argotaenia, Pseudotaxus chienii, Torreya jackii, T. grandis, Taxus chinensis var. mairei, Podocarpus macrophyllus, P. neriifolia, etc, are all found in the Cretaceous deposits.  The occurrence of Ginkgo can be traced hack to the Triassic. Most of the conifers, however, were found in the Ju- rassic, and they have remained to the present time as the main elements of the needle- leaved forests.      Among the primitive angiosperms, Magnoliaceae is represented by 19 species of 8 genera; Fagaceae and Lauraceae are the dominant evergreen broad-leaved tree species, the former by 6 genera and 43 species, and the latter by 10 genera and 42 species. Ha- mamelidaceae is represented by 10 genera and 18 species, while Ulmaceae, Tiliaceae, Elae- ocarpaceae, by 21 species of 7 genera, 9 species of 2 genera and 6 species of 2 genera respectively.       (2)  Rich in species and consisting of diverse geographic elements, but domi- nated by the tropical ones.      Throughout Zhejiang Province, there are over 1300 taxa of woody plants (includ- ing varieties and cultivated ones) belonging to 109 families and 423 genera.  Among them, 8 families with 25 genera and about 45 species, are gymnosperms, and the rest, 101 families with 398 genera and about 1260 species and varieties, are angiosperms.  The major angiospermous families include Mognoliaceae,  Fagaceae,  Lauraceae,  Theaceae, Aquifoliaceae and Bambusoideae.  Dominant families and genera are the tropical ones, and next in the order, are the East Asiatic, the E. Asia-N. American, then the tempe- rate, the cosmopolitan, endemic and other elements.       (3)  Rich in endemic species, in monotypic and oligotypic genera.       The endemic species include Abies beshanzuensis, Ostrya rehderiana, Carpinus pu- toensis, Carpinus tientaiensis, Celtis chekiangensis, Calycanthus chinensis, Machilus mi- nutiloba, M. chekiangensis, Semiliquidambar caudata var. cuspidata, Acer aeutum, A. yangjuechi, A. Changhwaense, A. elegantulum, A. pauciflorum, Ilex qinyuanensis, Sty- rax zhejiangensis, Photinia zhejiangensis, Actinidia zhejiangensis, etc.  The monotypic and oligotypic genera are examplified by Ginkgo, Pseudotaxus, Pseudolarix, Fokienia, Cyclocarya, Parakmeria, Pteroceltis, Sargentodoxa, Decaisnea, Aphananthe, Hemiptelea, Zelkova, Fortunearia, Semiliquidambar, Polithyrsis, Ostrya,  Heptacodium,  Tapiscia, Bretschneidera, Choerospondias, Kalopanax, Halesia, Hovenia, Emmenopterys, Eucom- mia, Pileostegia, Platycrater, Alniphyllum, etc.  The majority of the species mentioned above are rare and precious ones.       (4)  Introduced species gaining importance      Zhejiang Province is mainly situated in  the mid-subtropical zone, and from Yukuan District and the Wenzhou Prefecture southwards it belongs to the evergreen broad-leaved south subtropical forest belt. A number of south subtropical species, such as Eucalyptus spp., Casuarina spp., Acacia mearnsii, have  been successfully introduced into this region.  The introduction of other species, such as Cinnamomum cassia, Grevillea robusta, Michelia alba, Canarium album, Litchi chinensis, Euphoria longan, Kandelia candel, are successful in certain areas.  Small plantations of introduced species from S. W. China e.e. Cinnamomum glanduliferum, C. septentrionale have been established. In addition, Metasequoia glyptostroboides, Ulmus pumila, several exotic Pinus species, Carya illinoensis, Robinia pseudoacacia, Amorpha fruficosa, etc. are widely planted throughout Zhejiang Province. In recent years, cold-temperate species such as Chamaecyparis obtusa, Thuja standishii, Thuja occidentalis, Abies firma have been introduced and planted in the mountainous areas.  The forest flora of the province is thus being further enriched.       3.  Geographical analysis of the forest flora       (1)  The south part of Zhejiang lies in the transitional belt between the East and South China Floristic Regions, its east part being on the north margin of the South China Floristic Region, and its west part on the south margin of the East China Floristic Region.       (2)  The north part of the province is weakly influenced by the temperate elements, but the influence may extend to the central part of this province as the elevation there is higher.       (3)  Diverse floristic elements such as those belonging to Japan, Taiwan (China), C. China and S. W. China regions also occur in the province, especially in its western and eastern parts.  相似文献