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Table of Content
    Volume 11 Issue 1
    10 January 1987
      
    Research Articles
    The Pattern of K+ Efflux from Plants Leaves and Its Application in the Assessment of Atmospheric Pollution
    Liu Rong-kun
    Chin J Plan Ecolo. 1987, 11 (1):  1-10. 
    Abstract ( 1823 )   PDF (652KB) ( 922 )   Save
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    Using seven species of plants as materials, after exposing them to SO2, the author found that K+ efflux in plant leaves is independent of the concentration of K+ in the culture solution and the leaves. The efflux of K+ changes with different species, and the intensity of light, wider opening of the stoma and high sulphur content in the leaves make larger K+ efflux. They are closely linked with one another. On the basis of this pattern, the author evalutes the pollution situation of Shengyang by dividing it into four classes in accordance with the threshold and statistic methods (X±S) of the K+ efflux in Robinia pseudoacacia, and the result is the same as that by using the physico-chemical monitering method. The relevent equation between the SO2 concentration and the K+ efflux is as follows: Ŷ=0.0111X-0.0259(r=0.879, P<0.01). In accordance the SO2 concentration in the atmosphere was calculated from this equation in 1982 and 1988 and the forecast pictures were 95% true. This result shows that the new method is more reliable than the physico- chemical one.
    A Preliminary Study on the Effect of the Main Climatic and Edaphic Factors on the growth of Paulownia elongata
    Qi Jin-gen
    Chin J Plan Ecolo. 1987, 11 (1):  11-20. 
    Abstract ( 1787 )   PDF (659KB) ( 828 )   Save
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    Paulownia elongata is a native plant of the Huanghuaihai Plain. In the present paper, P. elongata is mainly studied of the ecological habitats of the plant with the methods of dendroclimatology, dendrochrology, forestry and autoecology. It was found that the volume index is better than the yearly ring index in reflecting the relationship between the growth of P. elongata and the ecological factors. The results based on analysing the annual mass of P. elongata regarding climatic ecological factors by the mono-correlative, poly-correlative and stepwise multiple linear regression analyses show that the percentage of sunny time, hours of sunny time, ≥IO℃ accumulative temperature and rain-fall are the most important among the climatic factors affecting the growth of P. elongata. According to the analysis of soil factors and physical characters, we believe that the texture, depth and nutrients of the soil are more important than other soil factors affecting the growth of P. elongata. Furthermore, we have extensively discussed the fast-growth conditions of P. elongata and divided its growth area into different regions. Finally, we are convinced that P. elongata has a great potentiality for development and that intercropping with P. elongata is a real community type for intercropping in the central region of the Plain.
    The Population Characteristics and determination of Biomass in the Quercus acutissima Forest Community on Mount Lao
    Li Xiang-gan
    Chin J Plan Ecolo. 1987, 11 (1):  21-31. 
    Abstract ( 2004 )   PDF (660KB) ( 898 )   Save
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    The Sawtooth oak (Quercus acutissima)forest community was measured by quarter point and quadrat methods. New patchness index has been suggested:

    Mathematical express of L index is the covariance of the probability of plant population density disposing in i resource axis’ j resource state and theoretical probability in i axis’ j state when the population is regularly disposed, (j=l,2,…’n; n=number of resource states). Dominant species in the shrub layer and herb layer were put in four axes–light level (k axis), relative soil water content (Rw axis), soil fertility score (F axis) and soil nitrogen content (N axis) and studied. Each species’ patchness index, niche breadth, niche overlap with other species have been analysed in the four axes. Shannon-Wiener diversity index (D) increases with the increase in abundance of resource, H’ (Homogeneity) decreases with the increase in abundance of resource, their regression equation:

    D=0.4040–0.0211 R+0.0248 F H’=1.112–0.1400 Ln Rw+0.00064N Biomass (W) regression equation:

    Herb layer: W= –12.30+4.07OLnRw

    Shrub layer: W= –16.70–0.0735k+2.080Rw–0.4400F

    Quercus acutissima’ seedling: W= –35.25+20.88LnN

    or W= 2.476 – 0.0371Rw

    A Study of the Grassland in Hainan Island
    Chen Zhang-he
    Chin J Plan Ecolo. 1987, 11 (1):  32-42. 
    Abstract ( 1862 )   PDF (603KB) ( 674 )   Save
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    This paper deals with the types and their distribution of the grassland in Hainan Island. Twenty seven communities have been distinguished so far according to dorminance. In these communities. 4 types are determined according to PCA.Most of the communities are secondary, which include the communities that have a savanna-like physiognomy in the western part of the island. Leptocarpus disjunctus community is primary and distributed in areas with special soil conditions. Soil fertility and water condition are the most important factors in determining the distribution of the grassland types.
    Studies on the Seasonal Dynamics of Height and Biomass for the Population Aneurolepidium chinense in an Artificial Grassland and Natural Community
    Gao Yu-bao
    Chin J Plan Ecolo. 1987, 11 (1):  43-49. 
    Abstract ( 1781 )   PDF (317KB) ( 735 )   Save
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    This paper compared the seasonal dynamics of height and biomass of the population Aneurolepidium chinense, which is the constructive species of the artificial grassland, with that of its neighbouring natural community.

    1. From the beginning of June to the middle of August, the height increase of the population follows

    and the maximum value of the average height reaches 52.98cm; furthermore, its individuals nearly occupy the middle and upper layers of the community; in the natural community, however, the curve of height increase of the population is expressed as and the maximum value of the average height is only 40.61cm.

    2. The biomass of the population increases as the following equation

    during the growing season, and the content of dry matter in the aboveground parts of plants varies by CA=27.4874+0.2245t. Both the peak of biomass and the maximum content of dry matter are more than those of natural community.

    Now the artificial grassland can be used as an area of mowing, and a large amount of grasses of good quality will be harvested from it.

    A Preliminary Study of the Age-Structure of Masson Pine Population at Jinyun Mountain
    Dong Ming
    Chin J Plan Ecolo. 1987, 11 (1):  50-58. 
    Abstract ( 1742 )   PDF (485KB) ( 848 )   Save
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    A Preliminary Study on Alder and Cypress Mixed Forest
    Deng Ting-xiu, Liu Guo-fan
    Chin J Plan Ecolo. 1987, 11 (1):  59-66. 
    Abstract ( 1592 )   PDF (480KB) ( 718 )   Save
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    The Vegetation and Rational Utilization on the Nanshan Mountain of Chengbu County, Hunan
    Xiao Yu-tan, Cao Tie-ru, Pen Zhong-hua, Xie Yuan-kai, Yang Yi-tuan
    Chin J Plan Ecolo. 1987, 11 (1):  67-74. 
    Abstract ( 1793 )   PDF (531KB) ( 889 )   Save
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    The Nanshan Mountain is the largest pasture in southern China, with a total area of 138,345mu (9,223 ha). According to the principle of ecology physiognomy, its vegetation can be divided into 10 main types. They are evergreen needleleaf forest; mixed evergreen and deciduous broadleaf forest; deciduous broadleaf forest; bush-wood; bamboo thicket; grassland, swampland; cropland; economic forest and fruit trees. The natural vegetation belongs to mixed evergreen and deciduous broadleaf forest or deciduous broadleaf and low montane forest. The present grassland was created by forest fires and felling of forest communities, i.e., unstable secondary vegetation.It follows that in the exploitation and utilization of nature resources on the Nanshan,forestry should play an important role and graziery should be combined with forestry. On slopes of over 35 degrees, forestry must be developed, and on those of 25–34 degrees consideration must be given to both forestry and pasturage, while on those under 24 degrees pasturage may be developed and all kinds of shelter-forest must be planted.
    The 30th Symposium of International Association for Vegetation Science (IAV) in Halle, GDR
    Song Yong-chang
    Chin J Plan Ecolo. 1987, 11 (1):  75-77. 
    Abstract ( 1479 )   PDF (227KB) ( 652 )   Save
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    International Symposium on Mountain Vegetation Was Held in Beijing
    Chen Wei-lie, Chen Qing-lang
    Chin J Plan Ecolo. 1987, 11 (1):  78-78. 
    Abstract ( 1373 )   PDF (78KB) ( 926 )   Save
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    Introduction on 《Dynamic Environment of the Plants》
    Hu Yi-hui
    Chin J Plan Ecolo. 1987, 11 (1):  79-79. 
    Abstract ( 1428 )   PDF (149KB) ( 530 )   Save
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