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Table of Content
    Volume 8 Issue 4
    10 April 1984
      
    Research Articles
    Preliminary Studies on the Phytocoenological Features of the Davidia involucrata Forests in the Wolong Region of Sichuan Province
    Zhong Zhangcheng, Qin Zisheng, Shi Jianhui
    Chin J Plan Ecolo. 1984, 8 (4):  253-263. 
    Abstract ( 1674 )   PDF (638KB) ( 848 )   Save
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    Wolong is situated between latitude 30˚45′—31˚25′ north and longitude 102˚52′—103˚34′’east, and belongs to Wenchuan of Sichuan Province. It is one of the Chinese natural preserves under the protection of the state. Wolong has a large area of Davidia involucrata forests. Davidia involucrata is a tertiary relict species in our country. In this paper, the Davidia involucrata forests are analyzed on the basis of the floristic geographical composition, the dominant species and the physiognomy and structure of the community. The discussion is made mainly on the following points:

    1. The floristic composition of the community in the site of Davidia involucrata forests consists of 154 species which belong to 60 families and 110 genera. This shows that the floristic geographical elements are very complex and varied. Among the 110 genera are relic floristic compositions of the tertiary period, such as Lithocarpus, Fagus, Helwingia, Tetracentron, Cercidiphyllum, Euptelea, Acer, Tilia, Juglans, Pterocarya, Viburnum etc, from which we can see the relic nature of the community.

    2. In mixed Davidia involucrata communities, the Davidia involucrata is distributed in each layer, from that of seedlings to that of arbors, which indicates that this species is a stable dominant one.

    3. The analysis of the life form spectrum, leaf-size class and leaf form from the 145 species showed that the nature of mixed Davidia involucrata communities is mixed deciduous-evergreen broadleaf forests.

    4. The dynamics of communities shows that the mixed Davidia involucrata communities are stable and developmental communities.

    Investigation of Taiwania flousiana Forests of Leigong Mountain Preserve in Guizhou Province
    Qiu Xianquan, Wu Shuyuan, Long Kaihu
    Chin J Plan Ecolo. 1984, 8 (4):  264-278. 
    Abstract ( 1688 )   PDF (800KB) ( 810 )   Save
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    The Leigong Mountain is the only region of centralized distribution of Taiwania flousiana in Guizhou Province. The region is located at the areas between 26˚20′—26˚25′N and between 108˚12′—108˚20′E. The distribution height in elevation is 800--1300m; the slope is more than 30 degree. The soil is deeper and pH value is between 4.1—5.3. The content of organic matter on topsoil is about 11%, but that under the topsoil is 6.8—0.3%.Through investigation of Taiwania flousiana forests in the Leigong Mountain, qualitative and quantitative analyses of the community characteristics of Taiwania flousiana forests, the authors proffer suggestions and measures of protection and development for its resources and promote natural regeneration of this plant by man.
    A Preliminary Studies on the Plotycladus orientalis Forests in the Qinling Mountain and the Loess Plateau of Northern Shaanxi Province
    Zhu Zhicheng
    Chin J Plan Ecolo. 1984, 8 (4):  279-293. 
    Abstract ( 1640 )   PDF (807KB) ( 830 )   Save
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    The Platycladus orientalis was developed in the dry and warm climate of forest-steppe during geological times, 2--3℃ warmer than the climate of such regions at present. This region is center of abundance of this species of plant. Owing to the limitation of biological factor, no zonal predominance of the plant was formed. As the supply of water and heat in these regions decrease gradually from the south to the north, corresponding changes of the Platycladus orientalis forests occur in the composition of species, stratification and structure of synusia as well as the ecological types of the plant. The present center of abundance of the Platycladus orientalis will not shift if no great fluctuations occur in the supply of water and heat in the future.
    A Study on Community Types of Evergreen Broadleaf Forests in the Daxue Mountain in Zhenkang County, Yunnan Province
    Peng Jian
    Chin J Plan Ecolo. 1984, 8 (4):  294-304. 
    Abstract ( 1529 )   PDF (757KB) ( 706 )   Save
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    The Daxue Mountain in Zhenkang county is situated in the southwest part of Yunnan Province, occupying 24˚20′N, 99˚06′E. The evergreen broadleaf forests under study are well preserved. They are characterized by complexity of types, abundance of tree species and wide distribution in a wide range of altitudes (from 1900m to 2800m above sea level). They are typical mountain humid evergreen broadleaf forests in the subtropical region of Yunnan.In the paper, according to similarity in community structure, dominant species and habitat condition, these evergreen broadleaf forests have been divided into five community types, They are:1. Lithocarpus echinotholus-Ardisia crispa var. amplifolia community; 2. Cyclobalanopsis glaucoides-Vaccinium bracteatum community; 3. Lithocarpus echinotholus-Ophiopogon grandis community; 4. Lithocarpus echinotholus-Acer sikkimense var. serrulatum community; 5. Lithocarpus echinotholus-Tsuga dumosa community.Stratification in all these communities is obvious. The trees totaling 85 species may be divided into three layers. Some of these species have tropical origin, such as species of the Elaeocarpaceae, Sapotaceae and Proteaceae. The dominant species of tree layer are different from the other mountain humid evergreen broadleaf forests in other places of Yunnan. One of them is the Lithocarpus echinotholus, which is distributed widely in this region. The trees of the upper layer are always mixed with a few deciduous broadleaf trees and the Tsuga dumosa (an evergreen needle tree). Bamboo groves of the species synusia are conspicuous in the undergrowth, which also contains of Chimonobambusa and Pleioblastus. The herb layer is not well developed. The dominant plant lifeforms of this forest are the mesophanerophytes and microphanerophytes, which account for 62.5% of the forest. The trunks of big trees are round and straight, the bases of which often become little buttresses. The timber storage of this forest reaches over 260m3/ha. The natural regeneration of the dominant species is very poor under the canopy, but better at forest-windows or forest-edges.It is suggested that these kinds of evergreen broadleaf forest must be delimited into a natural preserve, so that they may present a principal scientific base for forestry research.
    The Rice-Weed Communities and Bio-Ecological Characteristic of the Weeds in Baigezhuang of Hebei Province
    Yang Baozhen, Lü Dezi
    Chin J Plan Ecolo. 1984, 8 (4):  305-312. 
    Abstract ( 1605 )   PDF (612KB) ( 751 )   Save
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    This paper is a study of, the rice-weed communities and the bioecological characteristic of rice-weeds in Bai Ge Zhuang of Hebei Province. The main life-forms of the weeds in rice fields are therophytes, and perennial grass. Though they grow luxuriantly and have strong reproductive ability, there is a weak stage in the life cycle of every species of weed. In this stage, the nutrition of the seeds or the under-ground organs are exhausted at all and their strong roots haven’t developed yet. This is the optimum stage to control the weeds. The weeds often mix with the rice to form a rice-weed community which has certain floristic composition, structure and physiognomy. As a rule different plant communities form in different ecological conditions. But some of the rice-weed communities which have widely ecological amplitude can distribute everywhere in China. There are also seasonal dynamic and regularity of succession of the rice-weed communities. Such process is effected not only by the weed’s biological characteristics, but also by environmental conditions and the artificial influence. Only when the developments of succession of communities are fully known, can the effective measures be taken to control the weeds in time.
    The Biomass of Planted Oriental Oak (Quercus variabilis) Forest
    Bao Xiancheng, Chen Lingzhi, Chen Qinglang, Ren Jikai, Hu Yihui, Li Yang
    Chin J Plan Ecolo. 1984, 8 (4):  313-320. 
    Abstract ( 1926 )   PDF (447KB) ( 994 )   Save
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    Oriental Oak forest is widely distributed in 25˚—40˚N of China. Depending on the hydro-thermal condition of its area, this species grows well both in the Southern warm temperate zone and the northern Subtropical zone, in which the annual mean temperature is about 10˚—16℃ and rainfall reaches 500--1200mm.Oriental Oak is a heliophyllous tree. In Beijing, it mainly occurs at low hilly region with thin soil. Man’s activity are so frequent in the region that the physiognomy of natural Oriental Oak forest is uneven. The companion is Quercus dantata or Q. aliena. The shrub layer and herb layer are distinctive, the former being mainly composed of Vitex chinensis, Grewia biloba var. parviflora, Leptodermis oblonga, the latter being mainly composed of Clistogenes caepitosa, Carex nanella, Arundinella hirta, Themeda triandra var. japonica. In the planted Oriental Oak forest, the tree layer is of monospecies. The species and individual plants are less in number both in the shrub layer and herbaceous one.The biomass of a 26-aged planted Oriental Oak forest was determined at an altitude of 300m. of Xishan (Weat Mountain), in Beijing. The dry weight of each part of trees was obtained from ten sampling trees. Based on the power equation W=a(D2H)b, the data are as follows: trunk biomass 32.16 t/ha, branch biomass 9.85 t/ha, leaf biomass 1.68 t/ha, root biomass 9.95 t/ha. The biomass of shrubs and herbs obtained by harvest method are as follows: aboveground biomass of shrubs 1.33 t/ha, underground biomass of shrubs 2.3 t/ha; aboveground biomass of herbs 0.15 t/ha, underground biomass of herbs 0.8 t/ha. So the total aboveground biomass of the planted Oriental Oak forest is 45.17 t/ha, and the underground one is 13.05 t/ha, with the sum being 58.22 t/ha.
    The Variation of Leaf Area Index in Stands of Pinus yunnanensis
    Lin Hongrong, Jiang Hong, Liu Yuejian
    Chin J Plan Ecolo. 1984, 8 (4):  321-328. 
    Abstract ( 1518 )   PDF (444KB) ( 688 )   Save
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    In this paper the variation of leaf area index of stands of Pinus yunnanensis is studied and the relationship between leaf area index and the age, density and elevation gradient of the stand as well as the orientation of the stand slope is analyzed. Knowledge of these things is of great significance to forestry management.
    On the Measurement of niche Overlap in Plant Communities
    Wang Gang
    Chin J Plan Ecolo. 1984, 8 (4):  329-335. 
    Abstract ( 1629 )   PDF (411KB) ( 1134 )   Save
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    In this paper, the importance of niche overlap to plant ecology is expounded. It is pointed out that the measurement of niche overlap between plant species is distinct from that between animal species.The author suggests that ecological factor gradient should be replaced by community gradient and the interval of ecological distance may be used as weighting factor in the formula for measuring niche overlap. Thus measurement of overlap can be simplified. Taking the herbs growing under the forests of the Mahan Mountain as an example, the author measured the overlaps between species on two different conditions respectively, i. e. first on the gradient of light intensity, soil moisture and organic matter, and then on the community gradient. Both the results were analysed. Finally, the difference between partial overlap and total overlap and that between quadrats and resource states were discussed.
    Studies on the Transfer, Accumulation and Purification of Phenol, Cyanogen in the Common Waterhyacinty (Eichhornia crassipes)-Water System
    Wu Yushu, Bao Yijia
    Chin J Plan Ecolo. 1984, 8 (4):  336-345. 
    Abstract ( 1619 )   PDF (569KB) ( 785 )   Save
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    In this paper, the absorption, transfer and accumulation law of phenol and cyanogen in the water-plant system polluted by phenol and cyanogen and the plant Eichhornia crassipes that can be used for purifying water have been studied.Eichhornia crassipes can absorb and accumulate phenol and cyanogen in the water. By the analysis of phenol and cyanogen concentrations in water, it showed that the mean removal rates of phenol and cyanogen in water were 56.7% and 34.1% respectively, the highest were 85.1% and 52.2% respectively. Therefore the water quality is improved markedly. The content of phenol in different organs of Eichhornia crassipes is leaves>roots>stems, but the content of cyanogen is roots>leaves>stems. It is positive correlation between phenol and cyanogen contents in water and the permeability of the leave cell membrane. It shows that the degree of damage of the leave cell membrane increases correlatively. It is also positive correlation between the phenol and cyanogen contents in water and the activity of peroxidase of the plant. It shows the resistance of plant to phenol and cyanogen pollutant in water is related to the activity of peroxidase of plant.The phenol and cyanogen pollutant in water partly is absorbed and accumulated by Eichhornia crassipes, partly is adsorbed by roots of Eichhornia crassipes, partly is deposited onto the bottom of water.
    Brief News on Training Class of Plant Ecology, Guaugxi, 1983
    Li Xiangdong
    Chin J Plan Ecolo. 1984, 8 (4):  346-346. 
    Abstract ( 1415 )   PDF (140KB) ( 979 )   Save
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