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Table of Content
    Volume 14 Issue 1
    10 January 1990
      
    Research Articles
    A preliminary study on the biomass and production of slash pine plantation in jiangsu provice
    Wang Qi-ming, Shi You-guang
    Chin J Plan Ecolo. 1990, 14 (1):  1-12. 
    Abstract ( 1835 )   PDF (595KB) ( 626 )   Save
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    The biomass of the Slash Pine (Pinus elliottii) aged 6-40 years on different sites in Jiangsu has been investigated by the "divided-storeys" method. The total biomass, the average annual net production and the assimilation rate of needles are from 42.19—1
    Characteristics analysis of secondary forest vegetation in zijin mountain
    An Shu-qing, Zhao Ru-lin
    Chin J Plan Ecolo. 1990, 14 (1):  13-22. 
    Abstract ( 1809 )   PDF (564KB) ( 726 )   Save
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    There are 627 species of 389 genera, including evergreen trees such as Castanopsis sclerophylla, Phoebe sheareri, Cyclobalanopsis glauca and so on, in Zinjin Mountain. The phytogeographic components of the mountain have intermediate traits between tempera

    Studies on Biomass and Primary Productivity of two Dominance Species,Cryptocar ya corcinna and C. chinensis,of Forest Vegetation on Dinghushan
    Peng Shao-lin, Zhang Zhu-ping
    Chin J Plan Ecolo. 1990, 14 (1):  23-32. 
    Abstract ( 1811 )   PDF (503KB) ( 757 )   Save
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    In this paper, the biomass and net primary productivity of two dominance species, Cryptocarya concinna and C. chinensis, of forest vegetation on Dinghushan Mountain are studied. After surveying quadrat samples, the total numbers of the two species and the height and base area of every tree are measured. According to the data on harvested trees, the growth relation formulas of the varied parts of a plant are built, and then the biomass of the two populations are calculated. The photosynthetic rates and respiration rates of the two populations are also measured, and their photosynthetic values and respiration values as well as their net primary productivity are calculated.The results show that the biomass of Cryptocarya concinna is 68.208 t· ha-1 (fresh weight) or 39.053 t· ha-1 (dry weight); the biomass of C. chinensis, 43.733 t· ha-1 (fresh weight) or 24,092 t· ha-1 (dry weight). The net primary productivities of Cryptocarya concinna and C. chinensis are 2.384 t·ha-1·a-1 and 1.193 t·ha-1·a-1. According to the biomass and net primary productivitys of the two populations, the populations of Cryptocarya concinna and C. chinensis hold an importnat position and play an important role in the community.
    Genecological Studies of Spartina alterniflora Loisel I. The Difference in Physiological Reaction Among the Three Kinds of Spartina alterniflora in Saline Environments
    Chen Jian-qun, Zhong Chong-xin
    Chin J Plan Ecolo. 1990, 14 (1):  33-39. 
    Abstract ( 1761 )   PDF (443KB) ( 702 )   Save
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    Three populations of Spartina alterniflora were introduced from Moreherd City, North Carolina; Sapelo Island, Georgia; and Tampa Bay,Florida to China. To find out whether they are ecotypes or ecophenes, the following methods were employed: determination of membrane permeability, contents of amino acids and ions of potassium and sodium, photosynthetic rate and dark respiration in saline environments. Great differences were obtained among the three populations, thus providing evidence of differentiation into the three ecotypes. This is the result of ecotype differentiation for long-time selection of different environments and adaptation of the Spartina alterniflora genetype. In regard to salinity resistance, the Floridaecotype is the most sensitive; the georgiaecotype is the most tolerant; the North Carolinaecotype is intermediate.
    A Study on the Trend of Geographic Epidemic of Chinese fir Sterile Seed
    Lin Si-zu, Song Shu-xia
    Chin J Plan Ecolo. 1990, 14 (1):  40-45. 
    Abstract ( 1739 )   PDF (352KB) ( 790 )   Save
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    The paper, applying trend-surface analysis (TSA) to the geographic epidemic of Chinese fir seeds in Fujian Province by giving the quadratic polynomial model, interpreting the Chinese fir sterile seed epidemic pattern, drawing the sterile seed epidemic figure and dividing it into four areas, 1. The progressively decreasing region for the sterile seed epidemic in the southwest of Fujian; 2. The progressively: increasing region for the sterile seed epidemic in the southeast of Fujian; 3. The progressively decreasing region for the sterile seed epidemic in the north of Fujian; and 4. the progressively steady region for the sterile seed epidemic in the centre and the northwest of Fujian. It is suggested that the habitat of China-fir seed orchard should be selected in Jianou in the progressively steady region.
    Analysis of the Regional Differences of Floristic Composition and the Nature of Vegetation in the Lower Zone on the Eastern slope of the Helan Mountain Range
    Jiang Yuan, Tian Lian-shu, Lei Ming-de, Kang Mu-yi
    Chin J Plan Ecolo. 1990, 14 (1):  46-54. 
    Abstract ( 1826 )   PDF (535KB) ( 933 )   Save
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    In this paper, by using quantitative and qualitative methods, the regional differences of floristic composition and the nature of vegetation in the lower zone on the eastern slope of the Helan Mountain Range have been analysed, and the relationship between the species groups as a result of the ordination and ecological environments in the zone has also been discussed. The resuls of analysis show that all the main forms of vegetation in the zone have the common characters of desert or desertified steppe vegetation and the composition of the vegetation is different in the northern, middle and southern parts of the zone. Those differences reflect that, in the zone, the most humid area and the most arid area are respectively the middle part above the altitude of 1600 meters and the northern part below it. Therefore, in the zone, it is necessary to make use of and to conserve the vegetation resources in different ways.
    The Principle,Method,and Application of Ecological Regionalization—Explanation of the ecological Regionalization Map of the Inner Mongolia Autonomous Region
    Li Bo, Yong shi-peng, Zeng Si-di, Cui Hai-ting
    Chin J Plan Ecolo. 1990, 14 (1):  55-62. 
    Abstract ( 1832 )   PDF (448KB) ( 795 )   Save
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    Ecoregions are regions designated on the basis of regional ecological equivalence and similarity in their potential productivity. The hierarchical classification of ecoregions that we call ecological division or ecological regionalization, is one form of natural regionalization.There are three ranks in the hierarchical system of ecological division unit:Ecoregion: Ecoregion is a region that shows a similarity in general not only in biotic climate but also in potential productivity and limited factors, and has the same dominant vegetation type on the zonal habitat. The whole region of Inner Mongolia is divided into seven ecoregions.Subecoregion: Subecoregions, on the other hand, are the natural regions among the ecoregion, which are characterized by greater similarities in biotic climate, landform and soil conditions as well as in utilization and management. These regions are indicated by vegetation subtype as well as its lifeform composition and synusia (or ecological species group) structure. The whole mongolian autonomous region has been divided into 35 subecoregions.Ecodistrict: Within subecoregion, the regional changes in the characteristics of the ecosystem are, taking place due to the vast land expanse and geographical separation, so each subecoregion may be divided into ecodistricts. The differences in ecological characters, potential productivity as well as utilization is much less than that between the different subecoregions.The details of ecological division in the Inner Mongolia Autonomous Region is shown in its ecoregion map.The sequential arrangement of these seven ecoregions reflects the regular change of nature, which is brought about by the fact that rainfall gradually decreases from east to west and temperature increases gradually from north to south. Besides, the following characteristics are reflected on this ecoregion map: 1. The overlap of horizontal zone and vertical zone is obvious. 2. Along the fringe area on the Inner Mongolia Plateau, the ecotone is quite evident. 3. The factors causing regional differentiation vary from place to place. In humid and semihumid areas of the eastern part, the dominant factors are temperature and rainfall. In the arid area of the western part, however, soil structure and topography become the dominant factors.The purpose of ecological regionalization is to offer us a better understanding of the characteristics of the land resources in the various ecoregions, so as to further improve our utilization and management of these resources.
    Study on the Quantitative Dynamics of the Neosinocalamus Affinis
    Zhong Zhang-cheng, Li Rui
    Chin J Plan Ecolo. 1990, 14 (1):  63-68. 
    Abstract ( 1853 )   PDF (310KB) ( 641 )   Save
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    Neosinocalamus affinis is a bamboo species distributed most widely and cultivated for a long time. The following problems about it is discussed in this paper.

    1) Tile growth of the bamboo species under various stand conditions shows that there is no significant correlation between the density of the clump of the bamboo and the stand conditions, that the density is limited mainly by the thickness of soil, and that the height and the breast-height diameter of the bamboo correlate with the altitude above sea level.

    2) It is shown that the diameter and the height of the bamboo and its clump density decrease with the decrease in thickness and humidity of the soil from the valley to the top of the slope when the series of the bamboo in the valley is investigated,

    3) Study on the growth and development of the bamboo shoots shows that the increment of the bamboo correlate mainly with yesterday′s humidity and today’s temperature. The growth curve exhibits tow peaks for one day; the first is before 10 a.m., the second is after 3 p.m.. The number of the bamboo shoots which appeared above the ground correlate with the thickness of soil, whereas the number of the bamboo shoots which disappeared above the ground is mainly limited by the height of the mother bamboo and the number of the bamboo shoots which appeared above the ground. The number of healthy bamboo shoots is mainly affected by the thickness of soil and the bamboo height.

    Study on Dynamics of Litter Fall of Bruguiera sexangula Mangrove in Hainan Island,China
    Lin Peng, Lu Chang-yi, Wang Gong-li, Chen Huan-Xiong
    Chin J Plan Ecolo. 1990, 14 (1):  69-74. 
    Abstract ( 2296 )   PDF (408KB) ( 792 )   Save
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    The litter fall of Bruguiera sexangula mangrove community in Hegang Village of Hainan Island has been studied for a period of 4 years form 1984 to 1987.The results showed that: (1) Mean annual litter fall production was 1255 g/m2 in this well-protected mangrove forest, which is one of the most productive tropical communities in litter production. This amount of litter fall is of a higher level as compared with those of other mangrove forests in the world. (2) The leaf, flower, fruit and twig litter fall proportions in the 4 years were 64.32%, 10.63%, 21.34% and 3.71% respectively. (3) The regression equation of monthly litter fall (Y,g/m2) and monthly mean air temperature (X,℃) was Y=5.009X–13.18 (r=0.44, df= 46) showing a greatly significant relation. (4) Litter fall yearly fluctuation rate R= 1.33.
    Modeling the Relationships Between Photosynthetic Rate and Environment Conditions in an Aneurolepidium chinense Community,Inner Mongolia Region
    Qi Qiu-hui, Sheng Xiu-wu, Huang Ju-guang
    Chin J Plan Ecolo. 1990, 14 (1):  75-79. 
    Abstract ( 2115 )   PDF (289KB) ( 870 )   Save
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    The diurnal changes in the photosynthetic rate of an Aneurolepidium Chinens; community with environment Conditions were measured using an simulation chamber under field conditions. The diurnal change curve of photosynthetic rates in Aneurolepidium chinense community showed"double peaks"under normal conditions, one in the morning and another in the afternoon but it declined at noon. This behaviour can be correlated with environmental factors. Under good humidity conditions, the photosynthetic rate changed with photosynthetic active radiation; in drought condition, the photosynthetic rate was mainly effected by humidity. Using regression techniques, the relationship between photosynthetic rate and environmental conditions was y= - 4.28 +0.77x1-0.09x12 + 12.85x2 -8.71x22(where: y is photosynthetic rate, x1 is photosynthetic active radiation, x2 is relative humidity). The complex correlation coefficient of the equation was 0.92; relative error was 0.03 and the relative error of estimation was 0.21. Thus using the above model, the photosynthetic rate may be calculated and grass productivity predicted.
    Preliminary Study on the Relationship Between Development of R104 (A Variety of Amaranthus cruentus) And Environmental Conditions
    Sheng Xiu-wu, Qi Qiu-hui, Yang Hua-min
    Chin J Plan Ecolo. 1990, 14 (1):  80-86. 
    Abstract ( 2072 )   PDF (406KB) ( 621 )   Save
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    Amaranthus has several species of grain crop which could be used both as foodstuff and forage. R104,K112,No.1(three varieties of A.crucntus),No.2 (A.hypochondriaus) and No. 3 (A.hydrides),introduced from Rod1 Agricultural Centre in the state of Pennsylvania,U S A,have been planted in the Xilinguole steppe region of Inner Mongolia during 1985—1988. The result shows that R104 produce not only high yield of biomass but also matured seeds while the other four varieties produce also high biomass but less matured seeds or even unmatured seeds. Thus,R104 of premature property has a very bright prospect for its extensive cultivation in cold temperate zone with a non-forst period of only 100 days.

    Several comparative tests on the growth and development of R104 have been made with such treatments as various seed-sowing date, water content of soil, salt content of soil and fertilizing,the aim being to examine the biological and ecological properties of R104 and find out technological measures for practical cultivation. The results are as follows.

    1. R104 is a kind of temperature plants. Seeds will germinate and grow into seedling only when the daily average temperature is up to 10℃.When average temperature rises up to between 20 and 23℃,the plants will grow fastest. The seed sowing date should be from 1st May to 15 May. If seeds are sowed earlier they will not germinate, but if seeds are sowed too late the plants cannot produce new matured seeds.

    2. R104 is a photophilous plant. Under the condition of adequate water, its leaves will not wilt even under the light intensity of 140000LX. But if light intensity is below 20000LX, the plants will grow slowly.

    3. R104 is of relatively strong drought-resistant capacity. The Xilinguole steppe region belongs to the semi-arid zone. When total rainfall is about 210mm during growing season of from May to September, the biomass of R104 can still reach a certain level without irrigation, but could be double with it.

    4. It is possible to get 100t/ha of biomass and 3000kg/ha of R104 seeds under the condition of irrigation and fertilization.

    5. R104 is of strong saline-resistant capacity too, and its plants can develep normally when soil pH value is about pH9 and salt content of soil less than 0.6%.But biomass of R104 will decrease if salt content of soil is more than 0.8%.

    The stem, leaf and seed of the R104 plant have high contents of protein, fat, vitamin and mineral elements, The seeds have all the essential amino acids needed by human beings, in particular, the content of lysine being the ghighest. Therefore, to develop entensive cultivation of R104 is of important value for improvement of food stuff quality and as a new source of forage.

    Biosphere Reserve Concept and a Number of Related Problems as Illustrated by the Xilinguole steppe Natural Reserve
    Xiao Xiang-ming
    Chin J Plan Ecolo. 1990, 14 (1):  87-92. 
    Abstract ( 1774 )   PDF (353KB) ( 882 )   Save
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    The Xilinguole Steppe Natural Reserve was set up in August 1985 and designated as a biosphere reserve by UNESCO/MAB in 1988. Its planning was assessed and compared with the general principles of a biosphere reserve and was found to have several faults in its functional pattern and institutional cooperation, which makes it far from being a fully functioning biosphere reserve.

    As regards the functional pattern the author suggests that:

    1. In addition to the five core areas for meadow steppe, typical steppe and forests in the reserve, the abundant wetland vegetation and the corresponding wetland ecosystems along the Xilin River and lakes should be taken into account and a core area located in the river′s upstream should therefore be established;

    2. Conservative management and environmental monitoring activities could be performed in the core areas;

    3. The buffer zone surrounding the Picea meyeri forest core area should be combined with that surrounding the core area of Populus-Betula forest so as to form a broader buffer zone, so that coniferous forests, deciduous broadleave forests, brushwood and meadow steppe landscapes would merge into an entity;

    4. Within the transition area effective cooperation amongst various institutions and local pastoralists should be established and enhanced;

    As regards the institutional cooperation the followingsuggestions are put forward:

    1. To organize a cooperative committee in which meetings can be held by the representatives from the Conservational Pureau,Baiyinxile Livestock Farm and Inner Mongolia Grassland Ecosystem Research Station of Academia Sinica as well as local people;

    2. To draw up a master plan which taks into account all the core areas.

    Biosphere Project at the International Institute for Applied Systems Analysis
    Jie Ming
    Chin J Plan Ecolo. 1990, 14 (1):  93-94. 
    Abstract ( 1391 )   PDF (162KB) ( 739 )   Save
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    Introduction to the Book of 《Vegetation Mapping》
    Pan Dai-yuan
    Chin J Plan Ecolo. 1990, 14 (1):  95-95. 
    Abstract ( 1337 )   PDF (96KB) ( 722 )   Save
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    The International Symposium on Conservation Phytoecology was Held in Beijing
    Hu Yi-hui
    Chin J Plan Ecolo. 1990, 14 (1):  96-96. 
    Abstract ( 1407 )   PDF (85KB) ( 580 )   Save
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