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    15 December 2005, Volume 25 Issue 4
    Caragana ordosica, a new species of Caragana(Leguminosae)
    ZHAO Yi-Zhi, ZHU Zong-Yuan, ZHAO Li-Qing
    2005, 25(4):  385-388.  doi:10.7525/j.issn.1673-5102.2005.04.001
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    A new species of the genus Caragana Fabr.(Leguminosae) from Mongolia, Inner Mongolia, Ningxia and Gansu, C. ordosica Y.Z.Zhao, Z.Y.Zhu et L.Q.Zhao, is described and illustrated.The new species is similar to C. tibetica Kom.in the rachis all persistent, legume inside and outside villous, plant pulvinate, but differs by leaflet involute, tubular, with "O" transverse section, ala ear obtuse.
    A new species of Pyrrosia(Polypodiaceae) from Anhui Province
    ZHOU Shou-Biao, GUO Xin-Hu, YU Ben-Qi
    2005, 25(4):  389-390.  doi:10.7525/j.issn.1673-5102.2005.04.002
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    A new species of Pyrrosia(Polypodiaceae), P. dimorpha X.H.Guo et S.B.Zhou, is described and illustrated from the Huangshan mountain, Anhui Province, China.Pyrrosia dimorpha is morphologically similar to P. assinili, and distinguished from P. assinili by fronds close presented on rhizomes, divided 1~2mm between fronds, and fertile fronds with 1~2(or more) irregular forked apices.
    The new records of the distribution of the seed plants in Jilin Province
    CHU Jing-Hua, HAN Guo-Jun
    2005, 25(4):  391-392.  doi:10.7525/j.issn.1673-5102.2005.04.003
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    We reports the new record of six species of seed plants of Jilin Province, which belong to four families and six genera.
    A cladistic analysis of Lycoris(Amaryllidaceae)
    DENG Chuan-Liang, ZHOU Jian
    2005, 25(4):  393-399.  doi:10.7525/j.issn.1673-5102.2005.04.004
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    Cladistic analysis of the morphological, anatomical, pollen morphological and cytological relationship of 16 species of Lycoris(Amaryllidaceae) was carried out with attempt to have a better understanding of the phylogeny of Lycoris.Thirty-seven morphological, anatomical, pollen morphological and cytological characters were selected and used in the maximum parsimony(MP) tree construction executed with PAUP* program.Twenty-eight morphological, pollen morphological and cytological characters were also selected to construct MP trees.The topologies of the trees obtained were largely in congruence.In the same way, MP trees were constructed using 9 morphological characters to study the relationship of 11 species of Lycoris(Amaryllidaceae).They were L. radiata, Lhoudyshelii, Lhaywardi, L. sprengeri, L. squamigera, L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora.The result was the same as before.It was indicated that the 16 species of the genus Lycoris were divided into two groups, and four species of the genus which belonged to Lycoris subgenus including L. radiata, Lrosea, Lstraminea and Lhoudyshelii were clustered together respectively.The others were clustered together respectively.They were L.guangxiensis, Lhaywardi, L. sprengeri, L. incarnata, L. squamigera, L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora, L.caldwellii and L.shaanxiensis.The classification was basically consistent with the fingerprints of Lycoris on RAPD except L. sprengeri, L. incarnata and Lhoudyshelii.The latter group was also divided into two subgroups.L.guangxiensis, Lhaywardi, L. sprengeri, L. incarnata and L. squamigera were clustered together respectively, whose flowers were actinomorphic except L.guangxiensis.The others including L. longituba, L. anhuiensis, L. chinensis, L. aurea, L.×abiflora, L.caldwellii and L.shaanxiensis were clustered together respectively, whose flowers were zygomorphic except L. longituba and L. anhuiensis.Therefore, whether corolla was in order or not was an important classification character, but that which was considered as the character for subgenus classification was not supported in this paper.However, the position relation of the stamen and perianth slice can be used as the character for large group division, whether which could be as the basic feature for subgenus division still needed to be studied.The result also showed that leaf micro-morphological characteristics were useful for considering the inter-species relationship on Lycoris, and the period of leaves growing was not importance of considering that.The closest relationship was between L. chinensis and L. aurea, which were consistent with morphological study.
    Leaf epidermal characteristics and classification of sections of Leymus from China
    CAI Lian-Bing, ZHANG Mei-Niu
    2005, 25(4):  400-405.  doi:10.7525/j.issn.1673-5102.2005.04.005
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    The leaf epidermises of 15 species of Leymus were examined under the light microscope.It was found that these micromorphological differences shown by the lower epidermis may be applied to dividing the Chinese Leymus species into three groups.And in accordance with the external characteristics of each group, these three groups should separately belong to sect.Leymus, sect.Aphanoneuron and sect.Anisopyrum which were described by our predecessors.Moreover, according to the variation trends of leaf epidermal characters, the relationships among three Chinese sections were analysed as well.The results show that sect.Leymus is the most primitive and sect.Anisopyrum is the most advanced among three sections, whereas sect.Aphanoneuron lies between the above two sections;sect.Anisopyrum shows direct relationship with sect.Aphanoneuron, but indirect relationship with sect.Leymus.
    Anatomy structures study of Portulaca oleracea
    WANG Gui-Qin, CHEN Ka-Lin, DUAN Ya-Jun
    2005, 25(4):  406-409.  doi:10.7525/j.issn.1673-5102.2005.04.006
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    This paper deals with anatomical structures of the vegetative organs of Portula oleracea growing in saline-alkali soil of Chifeng, contrasted to the same species living in black soil, using light microscopical technique.The results showed that it adapted to saltmorphic circumstances through the following characters: A lot of aerenchyma existed in the vegetative organs;Phellem highly expanded in roots;thick cuticula;more mucilage cells and aleurone grains in parenchyma of roots and stems;A lot of water storing tissue.rich crystal cells and chloroplasts existed in mesopyll tisses.such characters were not existed in Portulaca oleracea which lives in black soil.
    Cluster analysis of the Haloxylon ammodendron communities in Junnger Basin
    REN Jun, TAO Ling
    2005, 25(4):  410-414.  doi:10.7525/j.issn.1673-5102.2005.04.007
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    Haloxylon ammodendron was the most important dominant plant in Junnger basin.On the basis of investigation results of typical Haloxylon ammodendron communities, the classification of these communities was carried on according to the similarity among communities by using numerical cluster.The results suggested that all 37 communities were included in 11 plant associations.According to the results of cluster analysis, 11 plant associations were included in 5 formations.The results of classification analysis were basically consistent with the traditional classification of Haloxylon ammodendron communities.The researching results was meaning for protection and restoration of Haloxylon ammodendron community in the future.
    Expression of Metallothionein-II in Arabidopsis thaliana improve desiccation tolerance
    TANG Zhong-Hua, GUO Xiao-Rui, ZHANG Yang-Yang, AN Zhi-Gang, YU Jing-Hua, ZU Yuan-Gang
    2005, 25(4):  415-418.  doi:10.7525/j.issn.1673-5102.2005.04.008
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    Metallothionein-II(MT-II) has been identified to play an important role in the exposure of plant to heavy metal like Cd and Cu.One of the mechanisms of MT's proposed to protect plants during this process is that it can quench the reactive oxygen species(ROS) activated by heavy-metal exposure.Here we demonstrated the effect of expression of MT-II in Arabidopsis thaliana on oxidative stress and damage extent during drought stress. The RT-PCR results suggested the implication of MT-II against drought stress in the transgenic Arabidopsis.Measurements of H2O2 and malondialdehyde (MDA) indicated that over-expression of MT-II in A.thaliana improved desiccation tolerance.
    Construction of prokaryotic expression vector of Arabidopsis pumila chitinase and its expression in Escherichia coil
    ZHU Xin-Xia, TIAN Li-Ping, GAO Jian-Feng, ZHU Jian-Bo
    2005, 25(4):  419-422.  doi:10.7525/j.issn.1673-5102.2005.04.009
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    Prokaryotic expression vector pET-CH of Arabidopsis pumila chitinase gene cDNA was constructed by means of recombinant gene technology and expressed in Escherichia coil BL21 under induction of IPTG, the expressed products were detected by SDS-PAGE analysis.Result show: Recombinant chitinase was efficiently expressed in E. coli BL21, it molecular weight was about 40 KD.The successful construction of prokaryotic expression vector containing Arabidopsis pumila chitinase gene and effective expression of recombinant chitinase in E. coli BL21 laid the foundation for further study on its biological function.
    Expression of BECTLIN Ⅰ gene in the leaf callus of Nicotiana benthamiana
    ZU Yuan-Gang, LIU Ying, GUO Xiao-Rui, MENG Qing-Huan, QI Chang-Qing, JIANG Yang
    2005, 25(4):  423-426.  doi:10.7525/j.issn.1673-5102.2005.04.010
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    We induced the callus from the leaves of Nicotiana benthamiana cultured in the MS medium and grew in the green house.Then we used the callus to detect the expression of BECTLIN Ⅰ gene which was correlated with Programmed Cell Death(PCD).The detection of RT-PCR showed that the fragment of BECTLIN Ⅰ gene cDNA was amplified in the leaves of the in-vitro plantlets subcultured in the medium and those of the plotted plant seedling, but BECTLIN Ⅰ gene expressed continually and steadily in the leaves callus of the plantlets.This probably indicated that auxins in the medium had some effect on the expression of BECTLIN Ⅰ gene.At the same time, PCD might occur in the course of the formation of the leaves callus, and in the state of dedifferentiation there probably appeared the embryoblasts with the same configuration and function.
    Cloning and sequencing analysis on the cDNA fragment SI800 separated from rye which related with salt tolerance
    WANG Zhen-Ying, PENG Yong-Kang, ZHENG Jian-Yu
    2005, 25(4):  427-431.  doi:10.7525/j.issn.1673-5102.2005.04.011
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    SI800 (Salt Induced(800 bp), SI800) was a cDNA fragment, which separated from rye leaves by DDRT-PCR.In this study, we purified SI800 by low temperature agarose electrophoresis and linked to pGEM-T vector then transformed to Escherichia coli(JM 109).30 positive clones were obtained.2 positive clones were selected randomly after test by digestion, PCR and sequenced.The result indicated that SI800 was composed of(735 bp).DNA sequence analysis showed(68%) homologue to uxaB gene for altronate oxidoreductase in GenBank.
    The nuclear change of tobacco transformed with chromatin of Chlamydomonas reinhardtii and the expression of nuclear gene
    ZU Yuan-Gang, GUO Xiao-Rui, WU Shuang-Xiu, MENG Qing-Huan, LI Yan-Hua, ZHANG Zhong-Hua, ZHANG Yu-Liang, SUN Jia-Yin
    2005, 25(4):  432-435.  doi:10.7525/j.issn.1673-5102.2005.04.012
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    Through the method of being frozen in the liquid nitrogen for a short time, and then thawing in the room temperature for several times, the protoplasts of Chlamydomonas reinhardtii were broken and chromatin were obtained.Then we exactly transformed the chromatin to the explants of the tobacco leaves by the micromanipulation, and then we cultured the explants, observed by the fluorescent microscope every day.The result indicated that the chromatin transformed explants, the nuclei of C. reinhardtii and tobacco were all changed.At the same time, the explants formed the callus and then grew into gemmule.Through the RT-PCR detection, we found the expression of the nuclear gene rbcs2.
    Cloning of human granulocyte-macrophage colony stimulating factor (hGM-CSF) gene in Anabaena sp. PCC7120
    WEI Lan-Zhen, Jin Rui, MA Wei-Min, SHI Ding-Ji, Gan Ren-Bao, WANG Quan-Xi
    2005, 25(4):  436-440.  doi:10.7525/j.issn.1673-5102.2005.04.013
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    Human granulocyte-macrophage colony stimulating factor(hGM-CSF) is one of a family glycoprotein cytokines that have potent effects in stimulating proliferation, maturation and function of hematopoietic cells.The gene encoding hGM-CSF was PCR amplified from the plasmid pAGMT-8 and modified by addition SD sequence to promote prokaryotic expression.The resultant hGM-CSF was inserted into downstream of the strong promoter, PpsbA of expression vector pRL-439, then ligated with pDC-08 to produce the shuttle expression vector, pDC-GM.The resulting pDC-GM was transferred into the filamentous, heterocystour cyanobacterium, Anabaena PCC7120, by the tri-parental conjugation transfer method.When cells were cultivated without antibiotics for many generations, the transgenic cyanobacteria remained resistant to neomycin.PCR amplification of wild type and transgenic Anabaena cells with primers P1 and P2 revealed no band in wild type and plasmid free cells, whereas transgenic cells yielded a about(390 bp) band.This is the first report of expression hGM-CSF in cyanobacteria cells.
    The study on secondary culturation after the protoplasts of Arabidopsis thaliana broken by ultrasonic
    ZU Yuan-Gang, MENG Qing-Huan, GUO Xiao-Rui, SUN Jia-Yin, LIU Hong-Mei
    2005, 25(4):  441-443.  doi:10.7525/j.issn.1673-5102.2005.04.014
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    After the protoplasts of Arabidopsis thaliana was broken by the ultrasonic and filtrated by the filter membrane,we subcultured the organs such as chloroplast and nucleus.It's observed that some chloroplasts were no fluorescence under the blue excitated light.The result indicated the ultrasonic had certain functions of destroying the chloroplasts.After being cultured for 115 h,the chloroplasts began to gather;and the nuclei obviously increased;also the bright green dots of endoplasmic reticulum appeared.As we all known the nuclei and endoplasmic reticulum are essential cell organs which form the new protoplast,so culturing cell organs may offer us some enlightenments about organs recombination and even for the cells reconstruction.
    Analysis on the content of Glycyrrhizic acid in different parts between wild and cultivated Glycyrrhiza uralensis
    ZHAO Ze-Hai, YANG Feng-Jian, CAO Jian-Guo, ZU Yuan-Gang
    2005, 25(4):  444-448.  doi:10.7525/j.issn.1673-5102.2005.04.015
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    The content of Glycyrrhizic acid(GA) in different parts of Glycyrrhiza uralensis in the west of Heilongjiang in China had been mensurated by ultrasonic extraction and HPLC.The results indicated that the ultrasonic extraction of GA from Glycyrrhiza uralensis was a convenient and effective method.The optimal condition was(50%) carbinol as the extraction solvent and(45 min) of ultrasonic extraction.The content of GA of underground parts of liquorice was more than that of overground parts.For wild liquorice, the content of GA, from high to low, were taproot, horizontal rhizome, inconstant roots and vertical rhizome.For cultivated liquorice, the content of GA, from high to low, were inconstant roots, taproot and horizontal rhizome.In general, the content of GA of overground parts was thimbleful.The content of GA of Leaflet was more than that of the other parts such as overground caudex and seed.The content of GA of underground parts in October was more than that of the same parts in May both for the wild and cultivated liquorice, and the phenomena were more obvious for cultivated liquorice.The artificial managements might cause some effects for the content of GA.For wild and cultivated liquorice, the mode of farm managements such plowing maybe caused the descending of the content of GA, which revealed that the appropriate intimidating environment, to some extent, will enhance the content of GA.In the west of Heilongjiang Province, China, the content of GA of wild liquorice taproots was higher at soil depths between(1.0)~(2.0 m), but that of cultivated liquorice taproots increased gradually with soil deepness.The higher content of GA in root tail of cultivated liquorice revealed that the taproots of cultivated liquorice did not reach its distribution depths in which the content of GA was the highest.
    Study on allelopathic effects of the invasive plant annual fleabane
    FANG Fang, MAO Wei, GUO Shui-Liang
    2005, 25(4):  449-452.  doi:10.7525/j.issn.1673-5102.2005.04.016
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    The extract from the organs above ground of Annual Fleabane(Erigeron annuus) was used to treat the seeds of some crop seeds, we determined the seeds germination, the length of root and seeding height of four crops.The results were as follows:(1) the allelopathic effects of Annual Fleabane does exist.(2) Higher concentration of the water extract of Annual Fleabane could restrain the seed germination and infancy developing, while lower concentration of the water extract could accelerate developing seed of Brassica chinensis var.communis and Lycoperiscum esculetum.
    Comparison and determination of total flavonoids in different parts of Hippophae rhamnoides
    LI Chun-Ying, WANG Wei, ZHAO Chun-Jian, LIU Xiao-Na, WANG Yan-Bing, ZHAO Bo, ZU Yuan-Gang
    2005, 25(4):  453-456.  doi:10.7525/j.issn.1673-5102.2005.04.017
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    The content distribution of total flavonoids in different parts of Hippophae rhamnoides L.from Russia was investigated.The sample pretreatment process involved ultrasonic extraction.The total flavonoids were determined by spectrophotometry, rutin as control sample.The experiment results showed that the contents of total flavonoids in leaf, pulp and pericarp were respectively(1.71%), (0.76%) and(0.55%), that the means content of total flavonoids in leaf is(2.3) and(3.1) times higher than that in pulp and pericarp.Thereby the leaf of Hippophae rhamnoides L.from Russia has value to be developed and used.
    Analysis of the component forestry harmful plant of Ambrosia artemisiifolia essential oil by Gas Chromatography-Mass Spectrometry
    YANG Feng-Jian, WANG Ji-Kun, ZHANG Ying, ZHANG Zhong-Hua, CHEN Hua-Feng, ZU Yuan-Gang
    2005, 25(4):  457-459.  doi:10.7525/j.issn.1673-5102.2005.04.018
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    The volatile components of the branches and leaves of A. artemisiifolia which a kind of forestry harmful plant were analysed.The extraction of essential oil was carried out by stem distillation and the distillate treated with ethyl ether.28 compounds were identified by GC-MS.The result can supply some help to understand the mechanism of the distributions to different wet zone and heat quantity zone and disease for plants.
    On caloric values and ash contents of ten weed species in Jinhua suburb and its adaptive significances
    GUO Shui-Liang, HUANG Hua, CHAO Ke, ZHU Yi-Jun
    2005, 25(4):  460-464.  doi:10.7525/j.issn.1673-5102.2005.04.019
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    In the suburb of Jinhua, the caloric values and ash contents of ten weed species were measured during their reproductive periods.These ten species include Veronica didyma, Polygonum hydropiper, Plantago asiatica, Plantago virginica, Ranunculus japonicus, Phytolacca acinosa, Roegneria kamoji, Poa annua, Lepidium virginicum and Torilis japonica.The main results are as follows: The average gross caloric values of the spikes, leaves, stems and roots of the ten weed species were(15.942), (14.293), (13.344) and(13.463 kJ/g) respectively, their average ash-free caloric values are(16.983), (16.219), (14.480) and(15.233 kJ/g), showing the order as spike leaf root stem according their caloric values.The average ash contents of the spikes, leaves, stems and roots of these ten weeds were(6.127%), (11.899%), (8.071%) and(11.383%) respectively, revealing that the leaves and roots had higher ash contents than their spikes and stems.The vegetative caloric values of Plantago virginica declined with the growth period, and their productive caloric values became higher with the increase of their population density.Analyses indicated that the weed species having lower caloric values might be a good choice to their adaptation to the undesirable environments, with obvious positive evolutionary significances.
    Fractal analysis of crown structure in Pinus sylvestris mongolica plantaiton
    LIU Zhao-Gang, LIU Ji-Ming, LI Feng-Ri, LIU Yan-Yan
    2005, 25(4):  465-470.  doi:10.7525/j.issn.1673-5102.2005.04.020
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    Fractal dimensions of crown surface area is developed by regression using data based on crown volume and foliage mass from 31 analysis trees of 7 permanent sample plots.Meanwhile biology model Lw=0.180397D3045903H-1.67348 is established to estimate foliage mass according to actual measurement.Combining data from branch analysis and stem analysis, we can dynamicly estimate crown volume one year, two year, three year ago.And furthermore the relations with power functions between crown volume and foliage mass may dynamicly estimate fractal dimensions of crown surface area one year, two year, three year ago.Therefore reflect tree crown construction variable dynamic regulation.For grasping tree crown fractal dimension of the different classifications, we calculated tree crown fractal dimension of the different classifications, utilizing volume occupied by each branch and dry foliage mass of branch from four samples plots in 2003.a new practical method for estimating fractal dimension of a single crown is developed.Tree crown fractal dimension is a useful and practical indice to symbolize tree crown dynamic growth variety.
    The study on phytogeographical distribution and differentiation of Caragana Fabr., Leguminosae
    ZHOU Dao-Wei, LIU Zhong-Ling, MA Yu-Quan
    2005, 25(4):  471-487.  doi:10.7525/j.issn.1673-5102.2005.04.021
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    The distribution map of each species is given(partialy compiled).According to that, geographical distribution of the genus Caragana Fabr.are systematically studied.Firstly, classification, evolution system of the genus are discussed.It can be summarized follows: Classification system: There are about 80 species in the genus belonging to 14 series, 6 section.Phytogeographical distribution: Firstly, the geographical distribution map of each species are given, basing that, distribution pattern of each species in each series and that of each series in each section are discussed.Then, distribution characteristics of the genus, Asia-temperature zone distribution, two center of abundance, expansion in west-east direction(latitude) and decline in north-south direction(longitude) are resulted.Origin, differentiation, migration: Series Caraganae is original type which take place(originated) from East-Asia in early-middle period of Territory period.The original type migrated rapidly in large scale, and formed the background of the genus evolution.Because of the change of climate and habit by Tibet plateau lifting, variety group was selected out in different place.New taxon units were produced in place with constant changing of climate and habit.In addition, relationship between morphological characteristics and climate as well as habit are studied.
    Study on the pteridophyte flora of Qimen Region in Anhui Province
    ZHANG Guang-Fu, CHEN Rui-Bing, QIAN Shi-Xin
    2005, 25(4):  488-494.  doi:10.7525/j.issn.1673-5102.2005.04.022
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    There are 107 species(including varieties, forms) which belong to 54 genera and 26 families in Qimen Region, Anhui Province.Among them a species, Drymotaenium miyoshianum is first recorded.The predominant families in Qimen region are Dryopteridaceae, Polypodiaceae, Athyriaceae;predominant genera are Dryopteris, Selaginella, Arachniodes.Based on the analysis of geographic elements of genera, the result shows that the pan-tropical elements are dominant, but of species, East-Asia elements including China-Japan and Chinese endemic elements are dominant.Qimen region is a key area of East-China flora.The pteridophyte of Qimen can be grouped into 4 distribution types, and of them the terrestrial ecological group is dominant in 107 species.According to similarities of species and cluster analysis of genera, this flora is much closely allied to Sanqing Shan and Tiantong Shan than the other areas, such as Baishilazi Nature Reserve, etc.
    A study on the flora of seed plants in Ruyuan county region of Guangdong Province
    DUAN Dai-Xiang, ZHAO Nan-Xian, YE Hua-Gu, CHEN Yi-Zhu
    2005, 25(4):  495-502.  doi:10.7525/j.issn.1673-5102.2005.04.023
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    Ruyuan County islocated in north of Guangdong Province, at 24°28'~25°06'N.and 112°52'~113°29'E.According to our investigations and statistics, there are 1 910 species of wild seed plants which belong to 753 genera and 171 families in Ruyuan County.Based on their geographical distribution, 171 families are classified into 11 areal-types, among them Pan-tropical element is dominant(57.14%), and the tropical elements make up(68.57%).753 genera are classified into 15 areal-types, among them Pan-tropical element is dominant(21.26%), and the tropical elements make up 58.19%.1 910 species are classified into 15 areal-types, among them endemic to China element is dominant(53.53%), and the tropical elements make up(29.25%).The dominant families in this area are Actinidiaceae, Lardizabalaceae, Styracaceae, Cornaceae, Rubiaceae, Hamamelidaceae, Theaceae, etc.Most of them are tropical and subtropical families.Comparing the Composition of the flora with those of 4 neighbouring regions, the flora of Ruyuan is quite similar to those of Lechang.
    A preliminary study on the stream macroalgae in Xin'an spring, Shanxi Province, North China
    HU Bian-Fang, XIE Shu-Lian, LI Yan-Hui, LIU Xiao-Ling
    2005, 25(4):  503-507.  doi:10.7525/j.issn.1673-5102.2005.04.024
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    Xin'an Spring located in the cross of Lucheng, Licheng and Pinshun county in Shanxi Province, North China.The spring is a large cool spring with rich algal resources.We selected 7 sites and sampled the algae four times from 1995 to 2003.In the research, 36 species of macroalgae have been identified, comprising 6 divisions, 11 families and 18 genera.Chlorophyta was the most diversified division, with 19 species in 4 families and 8 genera.Cyanophyta was ranked as second, with 11 species in 2 families and 5 genera.The third was Xanthophyta, with 3 species in 2 families and 2 genera.Which was ranked as the last were Rhodophyta, Bacillariophyta and Charophyta, they respectively only have 1 species in 1 family and 1 genus.The macroalgal flora of Xin'an Spring was mainly divided into 4 kinds of communities: Cladophora community, Vaucheria community, Spirogyra-Zygnema community and Chara community.The results show that the species diversity have become reduced.
    A study on Castanopsis fargesii forest classification in Guangxi
    WANG Xian-Pu, GUO Ke, QIN Hai-Ning
    2005, 25(4):  508-517.  doi:10.7525/j.issn.1673-5102.2005.04.025
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    Evergreen broadleaved forest dominated by Castanopsis fargesii is widely distributed in red and yellow soils on the hills and mountains of eastern central subtropics below(700 m) above sea level in Guangxi, it is a most representative zonal community type of this region, and it also fragmentally occurs in some mountainous areas of south subtropics and north tropics.Frequent 13 Associations in Guangxi are described in this paper, simple illustration of their geographical distribution, habitat property and species composition is given.All of these materials may be used for basis of their conservation and scientific management.