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Table of Content

    15 March 2000, Volume 20 Issue 1
    NEW TAXA OF WOODY PLANTS FROM HUNAN
    LIN Qin-zhong, QI Cheng-jing
    2000, 20(1):  1-6. 
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    NEW SPECIES FROM SHANDONG
    ZHU Ying-qun, ZHOU An-po, LI Yu-shi, LI Bin, XU Ji-fa
    2000, 20(1):  7-8. 
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    TWO NEW SPECIES OF ASTEROCAPSA
    XIAO Hong-xing
    2000, 20(1):  9-11. 
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    THE DISTRITUTION PATTERNS AND FLORISTIC ANALYSIS OF FAMILY PINACEAE OF CHINA
    WANG He-sheng
    2000, 20(1):  12-19. 
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    In view of the new advance of research on family Pinaceae and according to the new materials, Chinese plants of Pinaceae containing 10 genera and 95 species are classified into 4 distriution genera-patterns and 25 distribution species-patterns. That is 4 genera North Temperate paterns, 2 genera East Asia and North America disjunction, 3 genera endemic to China and 1 genus Vietnam to South China. The 25 species-patterns belong to respectively the 3 floristic kingdoms(or subkingdoms) of Eurasian Temperate, Malesian, and mainly to East Asiatic. Their characteristics through floristic analysis are mainly distributed in Sino-Himalayan forest sutkingdom and Himalaya-Hengduan mountain region being the distribution and differentiation center, a lot of vicarious distritutions, discontinuous or scattered distritutions as well as some relict distritutions because of the results of environmental change and geographical segregation. These materials and research results may be provided a reference for the research on biodiversity and plant geography of Pinaceae and etc.
    FLORISTIC ANALYSIS OF THE RARE AND ENDANGERED PLANTS IN ANHUI PROVINCE
    SUN Ye-gen
    2000, 20(1):  20-26. 
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    Based on deepgoing investigation and detailed floristic statistics, the floristic composition and the geographical distributed features of the rare and endangered plants in Anhui province are analysed in the present paper. The results are shown that this flora belongs to temperate subtropic flora, the floristic features of this flora can be summarized as follows: The floristic composition is rich, with lots of monotypic or oligotypic families and genera and with abundant archic, relic species; The geographical elements are complicated and the floristic connections with the other flora of the world are wide; The temperate subtropic elements are dominant, with obvious floristic transitions from subtropic flora to temperate flora; The endemicity to Chinese flora is conspicious, with typical floristic features of E. China's flora. On floristic phytogeographyical affinity, this flora is subordinate to E. Asiatic Kingdom, Sino-Japanese Forest Subkingdom, E. China Region, it has close relationships with C. China's flora and has profoundly been influenced by Sw. China's flora.
    THE GEOGRAPHICAL DISTRIBUTION AND FLORISTIC COMPOSITION OF GENUS RHODODENDRON IN THE GONGGA MOUNTAIN REGION, SICHUAN
    PAN Jie
    2000, 20(1):  27-35. 
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    The Gongga Mountain Region is located on the eastern fringe of Qinghai-Xizang Plateau and the north-eastern end of Hengduan Mountains. As we know so far the genus Rhododendron in Gongga Mountain Region comprise 2 subgenera and 79 species (including 4 varieties and 2 subspecies) The vertical distribution of the genus Rhododendron in Gongga Mountain Region: Eastern slope: There are 16 species of genus Rhododendron at 1090~2200(2500) m alt. in the subtropical evergreen broadleaf forest zone. At the altitude 2500~3600(~3800) m, in the subalpine coniferous forest zone, found 23 species with 1 variety and 1 subspecies, There are 4 species (including 1 variety and 1 subspecies) at the alpine bush and meadow zone. Western slope: There are 16 species with 1 subspecy at 2300~2800(~3000) m alt., in the river valley shrub zone, at the altitude of 3000~4000m, in the subalpine coniferous forest zone, found 42 species with 2 varieties and 1 subspecies. There are 13 species with 1 subspecies and 1 variety at 4000~4600m alt., in the alpine bush andmeadow zone. The floristic composition of the genus Rhododendron in Gongga Mountain Region. 1. One specy is the elements of the Sino-Japanese Subregion. 2. 78 species (including 4 varieties and 2 subspecies) are the Sino-Himalayan Subregion. (1) One species is distributed to Burna;(2) 44 species (including 4 varieties and 1 subspecies belong to endemic distribution of Sichuan; (3) 5 species are endemic species of Gongga Mountain Region. The floristic characteristics of the genus Rhododendron in Gongga Mountain Region are shown as follows: (1) The Gongga Mountain Region is one of the genus Rhododendron distribution centers. (2) The Gongga Mountain Region is one of the genus Rhododendron differentiation centers. (3) The genus Rhoodendron in Gongga Mountain Region have vertical replacement phenomenon.
    ANALYSIS ON THE FLORA OF SEED PLANTS OF WUTAI MOUNTAINS, SHANXI
    RU Wen-ming, ZHANG Feng
    2000, 20(1):  36-47. 
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    Wutai Mountains, belonged to Taihang Ranges and being one of the four Buddhist shrines of China, are located in North Shanxi and between 38°30'~39°15'N, 112°50'~113°50'E. There are 865 species of seed plants, belonging to 392 genera and 92 families in Wutai Mountains, among which gymnosperms have 3 families, 6 genera and 7 species, and angiosperms have 89 families, 386 genera and 858 species. The angiosperms are composed of dicotyledon and monocotyledon, having 76 families, 294 genera and 699 species, and 13 families, 92 genera and 159 species, respectively. The flora of genera in Wutai Mountains has some typical characteristics of warm-temperate deciduous broad-leave forest. Among them, temperate distribution elements, having 255 genera and accounting for 73.48% in total genera (excluding cosmopolitan), hold a significant dominant position. Moreover, among the floristic elements of species, endemic species to China have 286 species, accounting for 33.41% in total species, and makes evidently dominant. They are the major elements of the edificatos and dominant species of dominant vegetation types, such as Larix principis-rupprechtii, Pinus tabulaeformis, Picea wilsonii, Rosa xanthina, Ostryopsis davidiana, Myripnois dioica et al. Furthermore, the floristic elements of the genera of the seed plants of Dongling Mountains, Baihua Mountains in Beijing, Changbai Mountains in Jilin, Daqing Mountains in Inner Mongolia, Guandi Mountains, Taiyue Mountains, the Southern of Taihang Mountains and Zhongtiao Mountains in Shanxi, Taibai Mountains in Shaanxi and Wutai Mountains are studied comparatively by group-average clustering each other, respectively. The results are as follows: There is higher homogeneity and closely relationship between the floristic elements of Dongling, Baihua and Wutai Mountains, and some similarity between that of Changbai and Wutai Mountains. However, there are some differences between that of Daqing, Guandi and Wutai Mountains, and some significant differences between that of Taiyue, Taihang, Zhongtiao Mountains and Wutai Mountains. Moreover, there are significant differences between that of Taibai and Wutai Mountains. The main reasons for those are resulted from the differences among their eco-geographic conditions and floristic elements and among the edificatos and dominant species of vegetation types.
    CODMPAIATIVE STUDY ON THE MORPHOLOGY OF ARTEMISIA PLANTS FROM NORTHEASTERN CHINA Ⅱ STRUCTURE OF LEAF EPIDERMIS
    XING Yi, ZHANG Da-wei, GONG Xiao-buo, ZHANG Gui-yi
    2000, 20(1):  48-57. 
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    The morphological structure of leaf epiderm from 36 representative spcie in of Sect. Absintnium DC, Sect. Abrotanum Bess, Sect. Artemisia, Sect. Dracumculus Bess, and Sect. Latiobus Y.R. Ling from Artemisa were obserred in detail using scanning electron microscope, All the cpidermal cells varied in size and shape. The hypodermis had stoma. The shapes of the stoma were round.ovate and ovai. The types of stoma were anomocytac stoma. Anisocytac stoma and actinocytic stoma. The epiedrm of most plants had epidermal cell hain hair. The deffernce in these microstructural characters among groups may be of importance in taxonymy and ecology.
    A STUDY ON THE POLLEN MORPHOLOGY OF RHODODENDRON IN NORTHEAST OF CHINA
    MAO Zi-jun, YANG Yong-fu, HOU Li-jun
    2000, 20(1):  58-62. 
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    Pollen morphology of 6 species, 1 variety, 1 form of genera Rhododendron (Ericaceae), distributing in northeast of China, was examined in the light microscope(LM) and with the scanning electron microscope(SEM). All of the pollen grains of Rhododendron are characterized in tetrahedral tetrad. Pollen grains of Rhododendron are spheroidal or subspheroidal with 3-colporates, which shaped as half-colpi due to two neighborly grains of tetrahedral tetrad link together. Exine is composed with two layers in LM. The ornamentation of the exine is reticulate or granulate. The size of the pollen grains ranges from 34.7~61.7μm. Pollen grains are diverse in size and in the ornamentation of the exine. These can be taken as the characters for identification of species.
    A COMPARATIVE STUDY ON STOMATAL BEHAVIOR OF ADENOPHORA LOBOPHYLLA AND A. POTANINII UNDER DIFFERENT SHADE TREATMENT
    MA Shu-rong, YAN Xiu-feng, CHEN Bai-lin, ZU Yuan-gang
    2000, 20(1):  63-68. 
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    The stomatal behavior of both Adenophora lobophylla and A. potaninii was studied in this paper by means of shading experiment. With effect of different shade treatment on the stomatal physiological character and ecological adaptation of both A. lobophylla and A. potaninii being compared.The main results are as follow: compared with A. lobophylla, A. potaninii has showed strong of drought resistant and adaptive ability for different shade treatment. The stomatal open of blades for A. potaninii cut down gradually and part of the stomata closure in noon in nature light and light shade. The stomatal restriction for A. potaninii in photosynthesising was more evident, so was the non-stomatal restriction in photosynthesising for A. lobophylla.
    EFFECT OF SODIUM CARBONATE STRESS ON AMINO ACID CONTENTS OF PUCCINELLIA TENUIFLORA SEEDLINGS
    SUN Guo-rong, GUAN Yang, YAN Xiu-feng
    2000, 20(1):  69-72. 
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    Contents of free amino acid of Puccinellia tenuiflora seedlings were studied under sodium carbonate stress. The results showed that free amino contents increased and had a positive correlationship with sodium carbonate concentration. Contents of Ala, Cys, Gly, Leu, Met, Pro, Phe and Val increased with increasing sodium carbonate concentration. Contents of Ala, Cys, Gly, Leu, Met and Pro had a significant positive correlationship with sodium carbonate concentrantion. Contents of NH3 aaccumulated under Na2CO3 stress. In the meantime contents of Asp-NH2 increased. It can reduce the harm of NH3 to seedlings and enhance salt-alkali resistance.
    THE REGULATION OF DA-6 ON THE GROWTH AND PHYSIOLOGY ACTIVITY IN SABINA CHINENSIS
    LU Jian-zhou, XUE Xiu-chun, ZHANG Ai-lian
    2000, 20(1):  73-78. 
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    The activities of Nitrate Reductase and Peroxidase in Sabina Chinensis were enhanced dramatically after spraying DA-6. It also increased the contents of protein、nucleic acids、chlorophyll and endogenous IAA. It also enhanced the disease-resistance、accelerated the growth of plants、improved the economic value and appreciating value of Sabina chinensis. The optimum concentration of DA-6 treatment was 10mg/kg.
    A STUDY ON WATER PHYSIOLOGY AND QUANTITY OF DROUGHT RESISTANCE OF SEVERAL TREES IN THE HILLY LOESS REGION IN THE WEST OF SHANXI PROVINCE
    CHAI Bao-feng, LI Hong-jian, WANG Meng-ben
    2000, 20(1):  79-85. 
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    The P-V Curve water Parameters(WPs) of 12 trees are measured in field condition during tree growth season in 1996. The pattern of Wps' seasonal changes and trees' drought resistance and relationship between them are studied. We present the definition of osmotic adjustment ability(OAA) of trees using the parameter Ψisat and Ψitlp under water stress. The seasonal change pattern of OAA and the relation to the climate factors are studied. The synthetic evaluation of the trees' drought resistance has been done by using the method of quantitative analysis. Meanwhile the order of trees' drought resistance has also been done.
    ANALYSIS OF COMPOUND IN TWO LICHEN PLANT
    ZHAO Xiao-fan, SHAO Tie-hua, LAN Xiao-xia
    2000, 20(1):  86-88. 
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    Chemical constituents of two species Lichen in cladoniaceae were reported. We isolated to distinguish Usnic acid、Atranorin、Protolichesterinic acid、Diffractaic acid、L-Methioninccthy from Cladonia mitis and Cladonia rangiferina.
    GENETIC STRUCTURE OF LEYMUS CHINENSIS POPULATIONS IN THE CENTER OF SONGNEN PLAIN OF CHINA
    CUI Ji-zhe, QU Lai-ye, ZU Yuan-gang
    2000, 20(1):  89-93. 
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    The genetic structure of Leymus chinensis (Trin.) Tzvel. in the center of Songnen Plain of China in Heilongjiang province was examined by means of allozyme analysis. It was demonstrated that this species in the area has little genetic differentiation among populations (F ST ≤0.034). Low genetic differentiation among populations reflects potential influences of gene flows. It is likely that environment stress does not have the potential to influence patterns of genetic structure within local population.
    THE POPULATION GENETIC STRUCTURE OF AMBROSIA TRIFIDA IN DIFFERENT ENVIRONMENT
    SHA Wei, ZHOU Fu-jun, ZU Yuan-gang
    2000, 20(1):  94-98. 
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    The genetic structure of seven Ambrosia trifida population from northeast China were investigated using horizontal starch gel electrophoresis ten putative loci from ten enzyme systems were statistics analysis. The result showed very high genetic variability in population of A. trifida, with a percentage of polymorphic loci of 80.00%, an average number of alleles per locus of 1.80. The expected heterozygote was 0.375, the means of genetic identity and genetic distance were 0.959 and 0.042.
    CYTOLOGICAL ANALYSIS ON HYBRID F1 OF CROSSING COMMON WHEAT ph1b MUTANT LINE WITH TRITICALE
    GUO Chang-hong, SHI Rui, WANG Tong-chang, LI Ji-lin
    2000, 20(1):  99-103. 
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    Cytological irregularities was observed during meiosis in hybrid F1 of crossing common wheat "Chinese Spring" ph1b mutant with octoploid or hexaploid triticale. More univalents, heteromorphic bivalents and multivalents were observed in PMCⅠ, and lagging chromosomes, chromosomal fragments and micronuclei in anaphaseⅠ and telophaseⅠ. The disorder of chromosome synapsis resulted in homoeologue pairing and exchanging, leading to translocation and recombination between nonhomologous chromosomes.
    FRACTAL PROPERTIES OF THE SPATIAL PATTERN OF LARIX GMELINI POPULATION: BOX-COUNTING DIMENSION
    MA Ke-ming, ZU Yuan-gang
    2000, 20(1):  104-111. 
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    Box-counting dimension reflects the spatial occupation degree of an object. The box-counting dimension of population pattern discloses the spatial occupation degree of population and its scale variation degree, the inflection point indicates the aggregating scale of individuals. This study analyzed the scale variation degrees of the spatial patterns of Larix gmelini populations in several typical forest types in Daxingan mountains, China using box-counting dimension. The results showed that the spatial distributions of Larix gmelini populations were high(>1.5, near 2) in different types of Larix gmelini forests, which reflected the high spatial occupation degrees of the populations as the dominant species of these forest types. The order of spatial occupation degree was Vaccinium-Larix forest (1.829) > Grass-Larix forest (1.720) > Rhododendron-Larix forest (1.705) > Ledum-Larix forest (1.513). The Box-counting dimension of Larix gmelini population was lower (1.371, far from 2) in Larix-Betula mixed forest, which showed the low spatial occupation degree of the populations in accompaniment position in the forest. Comparisons on box-counting dimensions of Larix gmelini populations among natural forests and that of plantation showed that, the order of spatial occupation degree was Larix plantation (1.868) > Natural Larix forest (1.692) > Larix-Betula forest (1.371), which reflected the variation of functions and positions of Larix gmelini population in different forest types.
    FRACTAL ANALYSIS ON SPATIAL DISTRIBUTION PATTERNS OF POPULATION FROM QUERCUS LIAOTUNGGENSIS FOREST IN DONGLING MOUNTAIN, BEIJING CHINA
    ZU Yuan-gang, ZHAO Ze-hai, CONG Pei-tong, ZHANG Wen-hui, CHENG Bai-lin
    2000, 20(1):  112-119. 
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    In this paper, the coordinate positions and crown breadth of plant individuals have been analyzed by using their fractal dimensions. The distributon patterns of population and population dynamic in the Quercus liaotunggensis forests at different altitudes are compared and discussed. The method of fractal analysis of simulation crown breadth is considered as a better method of studying spatial distribution of plant individuals with different and complex crown breadth. As altitude rises, the capacities of spatial occupation of different populations are variable. Q. liaotunggensis population maintains high level, with a fractal dimension reached 1.9811; Acer mono population go down with a fractal dimension is minimum, 0.1170. Whereas Abelia biflora population is strong at low altitude, Rhododendron micranthum population has stronger capacity of spatial occupation at high altitude. On the given environmental conditions, the capacity of spatial occupation of different populations become probably similar. However, the same fractal dimension between arbor and shrub layer implies different meaning. The fractal dimension of crown breadth, implying the capacity of spatial occupation of plant population, is one of the important indices in process of dynamic analysis and population distribution pattern.