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   

“肠漏-免疫激活”的弱化——运动减轻抑郁性神经炎症的新通路     

章森  漆正堂  刘微娜 《体育科学》2020,(3):64-74

“肠漏”指的是在外界应激、高脂膳食等作用下,肠道通透性发生改变,使得肠道内革兰氏阴性菌发生移位,产生一系列的免疫激活。脂多糖(lipopolysaccharide,LPS)是肠道革兰氏阴性菌的主要组成部分,也是内毒素的主要活性成分。应激能够损坏肠粘膜屏障,增加肠道通透性,从而使LPS移位进入血液,在血清中由LPS结合蛋白运输至单核细胞和巨噬细胞,再与Toll样受体4(Toll like receptor-4,TLR4)结合后激活机体的神经免疫系统,相关脑区免疫系统的激活可能导致抑郁行为的发生。TLR4信号通路过度激活是抑郁的触发因素之一。适度运动可以弱化“肠漏-免疫激活-抑郁性神经炎症”,缓解海马神经发生、神经营养因子的减少。运动对“肠漏-免疫激活”的调控是治疗抑郁行为的潜在靶点。对该机制的探讨、梳理,有助于正确理解“肠-脑”对话机制在抑郁行为发生中的作用,也为运动干预抑郁行为提供更多的研究思路。  相似文献   

晋东南山地种子植物区系多样性研究   总被引：2，自引：0，他引：2  

茹文明  张金屯  张桂萍  张建国  金山  铁军 《长治学院学报》2005,22(2):4-8

晋东南山区地处山西省东南，有野生种子植物974种，隶属于456属125科，其中裸子植物7科11属15种，被子植物118科445属959种(其中双子叶植物104科396属833种，单子叶植物14科，49属126种)；双子叶植物和单子叶植物占山西和全国科属种的比例较大，优势科和优势属在晋东南山区植物区系组成中占有突出地位。从晋东南山地种子植物多度分布得出，菊科含属48属；禾本科39属；豆科23属；唇形科21属；蔷薇科21属。含种最多的科为菊科97种、蔷薇科96种、禾本科55种、唇形科43种。科内属和科内种回归分析得出，科内属和科内种显示出同样趋势，含属较多的科含种也较多。但科内属变化较平缓，而科内种变化较陡，种数迅速下降，并且有的较特殊，如禾木科含属仅次于菊科，但含种却次于菊科、蔷薇科和豆科；再如杨柳科含属仅两属，但含的种数却达到18种。以科内属和种的百分数为指标分析多度分布同样说明了这个问题。晋东南山地种子植物科属分布类型可划分为15个类型，以各种温带成分占绝对优势，共有250属(表2中的8，9，10，11，13)占总属数的60．98％，热带成分次之(有97属，占总属教的23．67％)，具有典型的暖温带落叶阔叶林的性质。种子植物种的区系地理成分可划分为12个分布区类型，以中国特有种占绝对优势，达383种，占总种数的39．32％，它们是构成晋东南山地森林植被、灌丛植被的建群种和优势种的主要成分。与其它地区植物区系和植被组成的比较分析表明，晋东南山地与秦岭太白山具有较高的同质性和密切的联系，与华中植物区系的关系有较近的亲缘关系次之，与华东植物区系也具有一定的联系。  相似文献   

湖南植物区系种子植物特有属的特征及其成因探讨     

王勋俊 《衡阳师范学院学报》1992,(3)

湖南植物区系有中国种子植物特有属65个,隶属于41个科,它们具有丰富性,古老性、热带亲缘关系和温带性质的特征。产生这些特征的原因主要有:①自三迭纪以来,具有相对稳定的地质历史;②是中国特有成分,东亚成分、东亚—北美成分的发详地;③是华东地区、华中地区和华南地区的交接地带。  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   

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   

运动、谷胺酰胺与肠道免疫     

彭飞  王海军  邓玉强 《体育成人教育学刊》2008,24(6)

现有研究表明，肠道是体内最大的免疫器官。由于运动所引起的肠道免疫屏障的损伤和防治，已逐渐引起广大运动医学研究者的广泛关注。综述了谷胺酰胺与肠道免疫、运动与肠道免疫，以及补充谷胺酰胺与运动机体运动肠道免疫间的关系的研究进展。  相似文献   

论中国-喜马拉雅植物亚区乌头属植物地理分布特点   总被引：1，自引：0，他引：1  

李良千 《中国科学院研究生院学报》1988,26(3):189-204

         本文对乌头属Aconitum L．植物分布区内各地区的分布作了分析，统计了各地区不     同等级分类群的频度，认为中国-喜马拉雅植物亚区是乌头属植物地理分布最大的频度中心、     多样性中心和特有种的分布中心。  文中还讨论了乌头属内的演化关系，以及本属与邻近属的     系统发育关系，发现在中国-喜马拉雅植物亚区既有许多原始类群，又有大量的进化类群，提出     了本亚区不但是本属植物原始类群的保存中心，而且是活跃的分化中心。产生上述结果的原因可能与喜马拉雅山脉的抬升以及本亚区复杂的自然条件有着密切的关系。  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