许昌地区种子植物区系分析     

姜罡丞  董东平 《许昌学院学报》2005,24(5):135-139

许昌地区地处伏牛山余脉向豫东平原过渡地带，属暖温带区域．根据吴征锰教授对中国种子植物分布区类型的划分，对本区种子植物的分布区类型的研究发现，本区种子植物各属共有15种分布区类型和15种变型；对其种子植物区系的属组成的初步分析发现，该区植物区系有以下特征：1）以温带性质为主兼有一定热带成分，显示出暖温带与北亚热带过渡交替的特征；2）区系地理成分多样，与其他植物区系问联系广泛；3）植物区系起源古老，存在一些中国特有、残遗属．  相似文献   

Treatment of engine-oil polluted wastewater with a mixed bacterial flora and kinetics of biodegradation     

WANG Liang WANG Lei LI Feng-ting LIU Hua 《重庆大学学报(英文版)》2007,6(4):238-241

A mixed bacterial flora was isolated from the soil of two petroleum-contaminated sites, then cultivated and domesticated in an open environment. The bacteria were used to degrade engine oil in wastewater. The optimum biodegradation conditions for all engine oil concentrations of respectively 489 mg L-1, 1 075 mg L-1 and 2 088 mg L-1 are bacterial inoculum concentration of 0.1%, temperature at 30 °C to 35 °C, pH 7.0 to 7.5, and rotation at 190 r min-1 to 240 r min-1. The second-order kinetic model proposed by Quiroga and Sales describes the characteristics of the biodegradation of the engine oil very well. Engine oil concentration barely changes the growth rate of the bacterial consortium. The mixed bacterial flora has a high biodegrading capability for engine oil.  相似文献   

WTO规则与中国野生植物资源保护     

宋才发 《青海师范大学学报(哲学社会科学版)》2004,(1):11-14

中国既是野生植物资源最丰富的国家之一,又是《生物多样性公约》的签字国,国家有关部门已经开始注意到了生物多样性的保护和生态安全保障。我国对植物新品种保护作出了明确的法律规定。必须依法保护农业野生植物,依法引进新鲜植物物种。同时又必须深刻认识外来物种入侵的威胁和危害,对外来入侵物种的危害必须依法治理。  相似文献   

白洋淀水生植物区系初步分析   总被引：1，自引：0，他引：1  

陈耀东 《中国科学院研究生院学报》1987,25(2):106-113

The Baiyandian Lake lies at 115°56′ E. and 38°55′ N.  It is about 8 m above sea level, with an area about 312 square km.  There are abundant aquatic plants here, inc- luding flowering plants of 30 families, 46 genera, 66 species and 3 varieties besides one in- troduced species.  32 species are erect ones covering about 48.5% of the total number of species in this lake, 20 are submerged ones, about 30.3%, 9 are leaf-floating ones, about 13.6% and 5 are floating ones, 7.6%.  The soil at the bed of the lake is very fertile and the depth is appro- priate, favouring various plants.  The coverage is large, sometimes it may reach 100%, for example, in communities of Phragmites communis, Hydrilla verticillata,  Hydrocharis dubis, Trapa bicornis, etc. Although the Baiyandian Lake is located in the temperate zone, the floristic elements are complex.  There are tropic-subtropic elements and elements of high-frigid zone as well.  When compared respectively with the floras of the Lakes Jingbo Lake, Honghu Lake and Lugu Lake, the flora of this lake is found more similar to that of subtropic Honghu Lake than to those of the other lakes, which shows that it hase a character transitional between the south and the north in China.  Further studies of the floristic relationships are needed in order to exploit and use the resources of the aquatic plants in this lake.  相似文献   

西藏蔷薇科植物的区系特点和地理分布     

俞德浚  陆玲娣  谷粹芝 《中国科学院研究生院学报》1984,22(5):351-359

The Rosaceae is one of the five largest families of Xizang flora,  consisting of 30 genera with 242 species,  the total number of species is slightly less than those of Compositae,  Graminae,  Leguminosae and Ericaceae in Xizang,  amounting to 62.5% of the total number of genera and 28% of the total number of species of the rosaceous flora in China.       The four subfamilies of Rosaceae including primitive,  intermediate and advanced groups have been found in Xizang.  These groups consist of 11 types of floristic ele- ments,  i.e. 4 genera belong to cosmopolitan,  9 genera belong to North Temperate,  3,  E. Asian-N.  American,  3 Sino-Himalayan,  3 Sino-Japanesa,  2 Old World Temperate,  1 Temperate Asian,  2 Mediterranean-W. and O. Asian,  1 C. Asian,  I Tropical Asian and 1 endemic to China. It is obvious that Rosaceae in Xizang comprises holarctic,  Ancient Me- diterranean and paleotropical elements,  among which the temperate components are the most dominant.  The characteristics of the floristic composition of Rosaceae in Xizang may be summarized as follows:       (1) Xizang abounds in both genera and species of the family which are diverse in forms,  including the primitive,  intermediate and advanced groups, (2) The geographi- cal elements are rather complex,  mostly belonging to the temperate,  among which the Sino- Himalayan components and the elements endemic to China are dominant, (3) The proportion of plants endemic to China and distributed in Xizang is much higher than those endemic to Xizang itself,  but there exist newly arisen species and infraspecific forms or varieties which show that the speciation is apparently still active in Xizang. The rosaceous flora of Xizang is a combination of old and new floristic elements,  based on the old floristic components,  affected by the upheaval of the Himalayas,  the differen- tiation and speciation have been taking place in the long history.       The geographical distribution of Rosaceae in Xizang may be divided into 5 regions, i.e. the northeastern,  southeastern,  southern,  northwestern and northern.  The rosaceous plants are most abundant in the southeastern area,  next in southern area,  fewer in the northeastern and very rare in the northwestern and northern regions.  The general ten- dency of the distribution of Rosaceae in Xizang is that the number of species gradually decreases from the southeast to the northwest and the habit gradually changes from trees,  shrubs and herbaceous plants in the southeast to cushion-like scrubs and dwarf perennial herbs in the northwest.  These facts clearly show that the uplift of the Hi- malayas has deeply affected the phytogeographical distribution of Xizang Rosaceae.       The rosaceous flora of Xizang has close relationships with those of the adjoring regions,  i.e. Yunnan and Sichuan.  Besides,  it is connected with floras of Nepal,  Sikkim, Bhutan nothern Buram and nothern India,  but silghtly influenced by the Ancient Medi- terranean flora.  相似文献   

白塔埠机场周边种子植物区系特征及生态分布研究     

邵世光  李廷友 《连云港师范高等专科学校学报》2011,(3):92-95

通过野外调查,对连云港白塔埠机场周边的种子植物区系进行了分析。结果表明:该区共有主要种子植物73科、190属、261种,其中裸子植物4科、5属、6种;双子叶植物56科、154属、216种;单子叶植物13科、31属3、9种。科的区系可划分8个类型和4个变型,以世界分布、泛热带分布和北温带分布为主;属的分布类型可划分为14种类型和9个变型,温带分布占总属数的46%;在种一级的分布中,世界分布种占总种数约71%,泛热带分布和温带分布各占13%,而热带亚洲至热带美洲、旧世界热带分布仅占1.2%,反映出由暖温带向亚热带过渡的特点。  相似文献   

渔业生物资源及濒危水生动植物保护法律制度分析     

刘新山  陈勇  白秀芹 《资源科学》2008,30(4):526-531

本文从法律的视角阐述了渔业和水生生物资源的概念,探讨了渔业捕捞许可、捕捞渔具和渔法管制、禁渔区（期）、重要的渔业生物资源名录、水产种质资源保护、增殖渔业资源和征收渔业资源增殖保护费、渔业水域环境保护等渔业生物资源保护法律制度以及濒危水生动植物名录制度和保护措施,并分析了其中存在的问题：主要是未依法区分渔业生物和非渔业生物、未建立明晰的重要的渔业生物资源名录、渔业资源增殖保护费缴纳义务人范围过窄、区分野生动物为“国家重点和地方重点”的立法思想缺乏科学性、环境资源立法的行政部门性和地方主义等,由此导致渔业法规与野生动物保护法规的不协调和冲突。建议依据《立法法》修改《渔业法》和《野生动物保护法》以及《自然保护区条例》,清理有关的法规,维护渔业法规和野生动物保护法规的协调性,厘清各自的适用范围,并依法建立渔业资源增殖基金和濒危水生野生动植物保护基金制度。  相似文献   

神农架自然保护区唇形科植物区系及资源植物分析     

方元平  刘胜祥 《黄冈师范学院学报》2000,20(6):44-48,52

神农架唇形科植物种类共有34属86种（含变种）,具有我国种子植物属15个地理分布区类型中的11个。区系成分以温带成分（23属45种）,特别是旧世界温带成分（10属20种）米体,表明该地区唇形科植物区系有以温带成分为主的多类成分共存的特点。唇形科资源植物十分丰富,按其用途可分为野生蔬菜类、蜜源植物类、观赏植物类、药用植物类、香料植物类、油脂植物类及特有植物类等,这些资源植物具有较大开发利用价值。  相似文献   

湖北三峡库区药用种子植物区系的研究     

项俊  葛继稳  吴金清 《黄冈师范学院学报》1999,(3)

对湖北三峡库区的药用种子植物区系进行了统计分析,将783属归为四大类15个分布类型．区系成分以温带性成分（424属）,特别是北温带成分（154属）为主体;热带性成分（266属）,特别是泛热带成分（117属）所占的比例也很高,表明该地区为我国南北植物的交汇区域;中国特有分布多（31属）．  相似文献   

以肠道菌群为靶点的运动性胃肠综合征干预研究进展          下载免费PDF全文

耿雪 《体育科研》2017,(3):78-83

运动性胃肠综合症是由运动引起机体胃肠系统出现功能性紊乱的一种病症，具备发病率高、范围广、原因复杂等特点，严重影响运动员的日常训练及比赛，因此如何有效防治成为研究重点。随着人类元基因组计划的启动，大量研究表明肠道菌群在维持肠道健康方面有着十分重要的作用。相关学者以肠道菌群为靶点，研究运动性胃肠综合征的发病机制后发现保证运动员肠道菌群的多样性和丰度可有效改善其症状，成为防治运动性胃肠综合征的新方法。故本文采用文献资料等方法分析运动性胃肠综合症的发病类型、影响因素及发病机制，剖析以肠道菌群为介入点改善运动性胃肠综合征的作用机理，深入总结前人研究，为运动性胃肠综合症及其防治的相关研究提供理论依据。  相似文献