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Table of Content
    Volume 21 Issue 1
    10 January 1997
      
    Research Articles
    Quantitative Characters of Reproductive Adaptation of Gordonia acuminata Population in Mt. Jin Yun
    Sun Fan, Zhong Zhangcheng
    Chin J Plan Ecolo. 1997, 21 (1):  1-8. 
    Abstract ( 1813 )   PDF (419KB) ( 853 )   Save
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    In Mt. Jinyun three kinds of communities in which Gordonia acuminata population exists were investigated. Based on reproductive allocation and static life table of G. acuminata, the fecundity table and reproductive value table were drown up. Meanwhile we also analyzed each genital index and the important eomponents of reproductive strategy,. The results indicate that for G.acuminata population in cvergreen broadleaved forest, the genital life was the longest and the fitness is the largest. The reproductive value, present reproductive value, residual reproductive value, accumulative residual reproductive value and total value for whole life history of G. acuminata were functions of time, and were restricted by the environments. Those indexes synthetically reflected the pattern and level of influences of interaction between heredity characters and environment factors on reproductive ability of special age individual of G. acuminata population, they also reflected its regular pattern of reproductive dynamics. The negative correlation between the survivorship rate (lx) and the present reproductive value (bx), and the negative correlation between life expectancy (ex) and reproductive invest strategy (ORE) reflected that the larger reproductive investment is, the larger mortality probability is.
    Density Regulation of the Clonal Growth of New Shoots in the Giant Bamboo Phyllostachys pubescens in Subtropical China
    Li Rui, Zhong Zhangcheng, M. J. A. Werger
    Chin J Plan Ecolo. 1997, 21 (1):  9-18. 
    Abstract ( 2074 )   PDF (494KB) ( 770 )   Save
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    It has been shown that in many clonal perennials, when light is limiting, shoot natality decreases and shoot mortality increases with increasing stand density. In this paper, emergence and survival of new shoots in a giant bamboo Phyllostachys pubescens, were observed in 25 permanent plots, each 6 m × 6 m, over a period of eight censuses at weekly intervals. Our results show that in this bamboo, shoot natality (the number of newly emerged shoots per plot) significantly increased with increasing density of adult shoots. More precisely, the number of newly emerged and/or surviving shoots, significantly increased with increasing density of adult shoots carrying new leaves, but not with that of those carrying old leaves. Furthermore, shoot mortality was density independent. This may be due to the fact that the stands where P. pubescens exists always remain relatively open, and the growth of the new shoots is not directly light-dependent.
    Influence of Fertilization on the Clonal Growth of Bamboo Shoots in Phyllostacachys pubescens
    Li Rui, M. J. A. Werger, Zhong Zhangcheng
    Chin J Plan Ecolo. 1997, 21 (1):  19-26. 
    Abstract ( 1832 )   PDF (443KB) ( 832 )   Save
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    Phyllostachys pubescens is a tree-like giant bamboo with important economic values. Based on a fertilization experiment designed in a way of completely randomized blocks, we investigated influences of different dosage and way of fertilization on the Clonal growth of new bamboo shoots in P. pubescens. It was shown that the mean number of bamboo shoots emerging and surviving per plot might be significantly increased up to more than three times by the fetilization, although the individual size was not significantly improved. The mean survival rates of bamboo shoots per plot were almost the same in all treatments. The bamboo may be able to selectively place more new shoots in the favourable sites than in unfavourable sites when it encountered a heterogeneous environment. On the other hand, there existed clear evidence that physiological integration occurred between new shoots developing in the poor sites and older shoots established in the good sites. Using plots of 9m × 9m, fertilization showed significant effects. Therefore, it is not necessary to use plots of 1mu (667m2) which were traditionally used. It is more profitable to fertilize patchily than evenly for increasing production.
    Model of Gordonia acuminata Population Dynamics and Analysis of Its Stability
    Li Xuguang, Yu Fawen
    Chin J Plan Ecolo. 1997, 21 (1):  27-32. 
    Abstract ( 1778 )   PDF (292KB) ( 749 )   Save
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    Gordonia acuminata is the dominant and constructive species of evergreen broadleaved forests in subtropical China. According to the periodic features of its life history ,the mathematical models were established to describe the quantitative relations of the cover degrees among the young sprouts ,the young trees ,and the adult trees. The results of the simulation of the population dynamics show that, at the local scale and in the certain range of the parameters value, there may exists a stable equilibrium state. But as time passes, the population will be in the state of unstable equilibrium.
    The Adaptive Changes of Membrane Fatty Acid Composition and Membrane Protective System of Gordonia acuminata Accompanied with the Temperature Decrease
    Liang Li, Tan Feng
    Chin J Plan Ecolo. 1997, 21 (1):  33-37. 
    Abstract ( 1776 )   PDF (233KB) ( 793 )   Save
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    The changes of membrane fatty acid composition and membrane protective system of G. acuminata leaves as the temperature decreases were investigated. The results showed an increase of the unsaturation of membrane fatty acid, and an increase of the SOD activity as well as Vc content, and new isozymes of POX appeared. These strengthened the protective system’s ability to sweep away the free radical. The results suggest that changes of unsaturation of membrane fatty acid are closely related with protective system , and are adapted to the chilling resistance development in G. acuminata.
    Comparative Study of Yong Leymus chinensis’s Electrical Resistance and Conductivity of Different Geographic Population
    Qian Ji, Ren Wenwei, Zheng Shizhang
    Chin J Plan Ecolo. 1997, 21 (1):  38-43. 
    Abstract ( 1892 )   PDF (299KB) ( 919 )   Save
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    The seeds of Leymus chinensis collected from different typical steppes in the Inner Mongolian Plateau in the same season were planted in campus of Fudan University, Shanghai and then their one-year-old seedlings were investigated. The changes of electrical resistance and conductivity in L. chinensis were measured after treated by polyoxyethylene glycols (PEG) of different concentration for six hours and twelve hours. The results show that the responses of electrical resistance and conductivity in L. chinensis from different geographic population was different. Using UPGMA, we found that those five geographic populations could be divided into three groups according to their changes in electrical resistance and conductivity. Among them, L, chinensis plants from Ji Lin and Ding Weizhan had strong resistance to drought, while those from Xiertala were weak . Those from A-Qi and Xiwu-Qi was intermediate.
    Reproductive Allocation in Gordonia acuminata in Subtropical Evergreen Broad-leaved Forest and Analysis of Its Adaptation Using Gray Rational Degree
    Sun Fan, Zhong Zhangcheng
    Chin J Plan Ecolo. 1997, 21 (1):  44-52. 
    Abstract ( 1877 )   PDF (468KB) ( 955 )   Save
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    The reproductive allocation (RA) of G. acuminata in different community types of subtropical evergreen broad-leaved forest of Jinyun Mountain was investigated. We analyzed the reproduction of the plant population as its adaptive strategies. Reproductive allocation in G. acuminata and its environmental adaptation were analyzed using gray rational degree and gray dynamic model. The results showed that the reproductive allocation in G. acuminata varied among age and community types. It was largest in pure forest of G. acurninata, intermediate in evergreen needle and broad-leaved forest, and smallest in evergreen broad-leaved forest. The gray rational analysis revealed that the soil pH, the average air temprature, the organic matter content of soil and soil moisture played an important role in formation of reproductive allocation of G. acuminata. The gray rational time dynamic model for interaction between reproductive allocation and environmental factors was expressed as:dy/dt+0.42y=0.07x1–4.26x2–6.38x3+15.54x4–7.46x5+4.72x6+1.97x7–0.66x8+0.57x9–0.20x10
    Studies on the Dynamics of the Bamboo shoots in Phyllostachys pubescens
    Li Rui, Zhong Zhangcheng, M. J. A. Werger
    Chin J Plan Ecolo. 1997, 21 (1):  53-59. 
    Abstract ( 2162 )   PDF (433KB) ( 912 )   Save
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    In terms of the knowledge about the regulation and adaptation of clonal plants, this paper deals with the temporal and spatial dynamics of bamboo shoots in Phyllostachys pubescens. It was found that the mean number of new shoots emerging per unit area and the mean individual size varied among years. More, larger and higher new shoots emerged and survived in the favourable year than in a unfavourable year. Furthermore , shoots of the earlier cohorts were constantly larger and higher than those of the later cohorts from beginning to end. Shoots of the earlier cohorts grew slowly before their fast growing, while shoot growth of the later cohorts did not show such a slowly growing phase. Nevertheless, All shoots of both cohorts reached the fastest growing phase almost at the same time. The daily height increment of the bamboo shoots may amount to approximately 100 cm per day. It was discussed that why and how subtropical bamboo shoots differing in emergence time in spring may reach the canopy almost at the same time. At last, some suggestions were proposed for the management of the bamboo forests.
    Density and Growth Dynamics of Leymus chinensis Population
    Piao Shunji, Yang Chi, Huang Shaofeng, Song Minghua
    Chin J Plan Ecolo. 1997, 21 (1):  60-66. 
    Abstract ( 1899 )   PDF (528KB) ( 1028 )   Save
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    The influence of Leymus chinensis population density on growth dynamics at modular level was investigated. The correlation between density and growth dynamics of single experimental L. chinensis was analyzed. The results were as follows:① Genet’s density influenced ramet’s density and developmental process. Adjusting genet population density can narrow the variation range of ramet density. ② The population biomass increased as density increase, but it did not come to a constant value. But the biomass per genet began to decrease as density became bigger. ③ Under low density, vegetative propagation dominated and survival capacity of rhizome buds was high while sexual reproduction dominated and the reproduction allocation value was big under high density.
    Quantitative Structure and Dynamics of Leaf Populations of Gordonia acuminata on Jinyun Mountain
    Li Yunxiang, Liu Yucheng, Zhong Zhangcheng
    Chin J Plan Ecolo. 1997, 21 (1):  67-76. 
    Abstract ( 1834 )   PDF (558KB) ( 872 )   Save
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    Based on the modular theory ,the size dynamics ,growth pattern and quantitative structure of leaf population of representative genets of Gordonia acuminata were studied. The results were as follows:The natality of leaf population in all genets followed a monomodal curve and it reached its peak value from the end of March to the beginning of April. The pattern of leaf-expanding approximates the “flush-type” suggested by Kikuzawa (1983). The mortality is bimodal shape. The first peak appeared at the beginning of April, which was just a little later than that of the natality’s. The second peak appeared at the end of the growing season. The relationship between the genet’s age and its leaf population size could be well modeled by means of the power function and the Logistic equation. The earlier the new leaves were born, the more slowly their leaf areas and biomass increased. Generally, the area of 2 or 3 years old leaves no longer increased. The maximum area of leaf population appeared from July to August in mature genets, and from August to September in young genets. But the maximum biomass is formed in October in both mature and young genets. This suggests the mature genets reproduce between formation of the maximum leaf area and formation of the maximum number of leaves or biomass.
    POD’s and SOD’s Activity and MDA’s Content in Different Geographic Populations of Leymus chinensis’s
    Ren Wenwei, Luo Xiuquan, Zheng Shizhang
    Chin J Plan Ecolo. 1997, 21 (1):  77-82. 
    Abstract ( 1829 )   PDF (272KB) ( 1142 )   Save
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    The changes of POD’s, SOD’s activity and MDA’s content in the different geographic population of Leymus chinensis were measured after treated by polyoxyethylene glycols (PEG) of different concentrations for twenty hours and forty hours. The results showed that the responses of POD’s, SOD’s activity and MDA’s content in L. chinensis from different geographic populations were different. Using UPGMA, we found that those four geographic populations could be classified into three groups according to the changes of POD’s, SOD’s activity and MDA’s content.
    Biomass and Leaf Area Dynamics of Modular Populations in Gordonia acuminata
    Yin Shuyan, Liu Yucheng
    Chin J Plan Ecolo. 1997, 21 (1):  83-89. 
    Abstract ( 2007 )   PDF (355KB) ( 947 )   Save
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    The modular population dynamics and leaf area dynamics in Gordonia acuminata in Mt. Jinyun were studied. They were both expressed by the logistic equation. But there were particularities at different level: (1) The dynamics of leaf biomass and leaf area were similar. They could be well fitted by power function and logistic equation. Their figures looked like flatted and upside clown S-shape. (2) Biomass of roots, leaves, branches and buds began to increase again after a cease period of growth. Perhaps they were a spirally logistic increase, differing from traditional logistic curve. (3) In the process of the stand development, the innate increasing rates of branch and stem were very high, the ratio of branch and stem biomass to the tota biomass continued to go up ,accounting for 0%~11% and 19~66% respectively. The corresponding ratio for roots was constantly around 22% ,while innate increasing rate of the leaves and buds was smaller and the ratio for them continuously declined :from 61 to 1% and from 0.2% to 0. 003%, respectively. Furthermore, the decrease in leaves and the increase in branches and stems showed dual linear correlation (p<0.01). It shows that chance to receive biomass differ among different modulers. Branches have priority over stems in this aspect.
    Polyacrylamides Membrane Chromatogrphy of Flavonoids in Gordonia acuminata
    Zeng Bo, Zhong Zhangcheng
    Chin J Plan Ecolo. 1997, 21 (1):  90-96. 
    Abstract ( 1675 )   PDF (406KB) ( 810 )   Save
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    Gordonia acuminata is a widely distributed tree species. Its secondary metabolism features differ significantly with its geographical distribution. By the method of polyacrylamides membrane chromatography and quantitative analysis, the flavonoids in G. acuminata were analyzed using the samples collected from Mt. Laojun (situated in Wenshan, Yunnan), Danling (in Sichuan ), Xingwen (in Sichuan), Mt. Jinyun (in Sichuan). Sanchahe (in Yangshuo, Guangxi) Sanpan (in Yangshuo,Guangxi), Mt. Gupo (in Hexian,Guangxi). The results show that G. acuminata plants collected from different geographical regions were very different in flavonoids components. Based on the variations in flavonoids components, three kinds of geographical distribution patterns of G. acuminata were distinguished: (1) higher elevation and lower latitude distribution, (2) middle elevation and lower latitude distribution, and (3) middle elevation and middle latitude distribution.

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