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Table of Content
    Volume 17 Issue 3
    10 February 1993
      
    Research Articles
    Detrended Correspondence Analysis of Koreanpine Broadleaf Mixed Forest in Changbai Mountain Biosphere Reserve
    Huang Jing, Han Jin-xuan, Yang Han-xi
    Chin J Plan Ecolo. 1993, 17 (3):  193-206. 
    Abstract ( 2439 )   PDF (798KB) ( 1109 )   Save
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    Detrended Correspondence Analysis is used to analyse the distribution of Korean Pine-broadleaved forest along the environmental gradients and the relation between varities of forest types and environmental changes. The results show that the integrated changes of various factors, such as water temperature and humidity in response to increasing altitudes in Changbai mountain,are the main gradient which decides the diversity of Korean Pine-broadleaved forest, the next is the changes of local topography and micro-topography. The technique of secondary ordination is applied to classify the Korean Pine-broadleaved forest and a classification system is given at the end of the paper.
    Research on the Use of Point-Centered Quarter Method in Phytoeoenological Investigation on the Experimental Stand of a Tropical Mountane Rain Forest Community
    Zhang Jia-cheng, Jiang You-xu, Wang Li-li, Huang Quan, Zheng De-zhang, Li Yi-de, Zhao Yan-min
    Chin J Plan Ecolo. 1993, 17 (3):  207-216. 
    Abstract ( 1940 )   PDF (651KB) ( 850 )   Save
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    The result obtained with point-centered quarter method by 56 sampling points was compared with the results obtained with actual measurement and count-plot method by 78.5 % sampling ratio of area in phytocoenologicai investigation on a tropical mountane rain forest community in Jianfengling region, Hainan Island. The comparison showed that density,mena area at brest height, dominance, number of component species and order of I. V. of component species obtained with the point-centered quarter method were satiafactory for phytocoenological investigation. The advantage in speed with the point-centered quarter method was particularly great, with a saving of 60% or more in term of time spent by the count-plot method. But the determination on number of sampling points for the expenimental stand was not based on the conclusion, in almost all the cases, a sample of sufficient size to give an adequate sample of distances will produce an adequate sample of basal area as well, which was drawn by Cottam and Curtis, the designers of point-centered quarter method. The number of points required by adequate sampling of mean area at brest height was the number of sampling points for the experimental stand of the tropical mountane rain forest community.
    Study on Pattern and Successional Trend of Vegetation in Qinghai Lake Region
    Peng Min, Chen Gui-chen
    Chin J Plan Ecolo. 1993, 17 (3):  217-223. 
    Abstract ( 1661 )   PDF (531KB) ( 728 )   Save
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    Qinghai Lake is the largest inland one in China. It is situated in the northeastern part of Qinghai-Xizant (Tibetan) Plateau. The area of Qinghai Lake region is 29661km2. The lake area is 4304.5km2 measured in 1986.

    The vegetation types distributed in Qinghai Lake region mainly include desert vegetation, temperate steppe, alpine shrub, alpine meadow, alpine steppe and alpine subnival vegetation. In this region, the dominant vegetation types are of alpine ones, and the temperate types are only distributed in the area near the lake.

    Based on our investigation and analysis, some characteristics of vegetation succession in this area are showed as follows:

    (1) The forest is a stage of regression. Only two tree species(Sabina przewalskii and Picea crassifolia)are distributed as relic species in this area.

    (2) The alpine vegetation types are relatively developing, but the temperate vegetation are not.

    (3) The vegetation around Qinghai Lake has its individual characteristics and special successional trend, In general, vegetational landscape in Qinghai Lake region has been tending to become one which has a strong adaptation to extremely high and harsh habitats.

    According to the study on succession of aquatic environment and palaeoclimatology and ancient sporopollen analysis. The climate of this area tended to become colder and drier although the fluctuation did exist during the process of change. Under the increasing pressure caused by this climatic change, the plant species which adapted the change got developed, and the development of individual species which did not adapt to this change was suppressed and inhibited, This is the reason why vegetation around Qinghai Lake tended to success towards the type adapting extremely high and harsh habitats.

    Study on Dividing the Successional Stages of Forest Communities with Division Method of Optimization
    Zhang Jia-lai
    Chin J Plan Ecolo. 1993, 17 (3):  224-231. 
    Abstract ( 1827 )   PDF (519KB) ( 931 )   Save
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    Based on the mathmatical methods and computer technology, the paper deal with the succession of Pinus massoniana communities on the natural condition in the mountains of northern Fujian Province, China, based on samples from 82 10×10m2 plots and 320 2×2m2 plots. Successional stages of all species in the area were divided into three groups, failing, transition and progressing according to their species association coefficients of X2 statistics. The sere was reconstructed and the five stages were defined from the result of the relative important value of the three groups with the division method of optimization.
    The Study of Edge Effect of the Forest Communities in Jinyun Mountain
    Xi Wei-min, Zhong Zhang-cheng, Bi Run-cheng
    Chin J Plan Ecolo. 1993, 17 (3):  232-242. 
    Abstract ( 2150 )   PDF (612KB) ( 793 )   Save
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    This paper explores the characters of gap edge effect of the forest communities in Jinyun mountain. The species diversity and ecological dominance as well as the index of the edge effect of 29 forest gaps in Jinyun mountain are measured, on the basis of Shannon-Wiener index and Simpson index as well as the index of the edge effect. The results show that three indexes have an effect on explaining the gap edge effect in forest communities. Based on the measurement of the species diversity, the index of the gap edge effect in subtropical forest communities is about 1—3, and on the basis of the ecological dominance index, the former result is about 0.1—1.2, the results also show that the index of gap effect of forest communities is affected not only by its size, but also by its aspect and growing phase. The importance of gaps for regeneration of trees and maintenance of species diversity as well as the application of the gap edge effect on forestry practice are discussed.
    Community Features and Ordination of Some Meadows in Xilin River Flood Land, Inner Mongolia
    Li Yong-hong, Liu Shu-rong, Zhang Zhi-cheng
    Chin J Plan Ecolo. 1993, 17 (3):  243-252. 
    Abstract ( 2022 )   PDF (580KB) ( 893 )   Save
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    Community composition, organization laws, above ground phytomass and habitat characteristics of three main meadow communities in the Xilin river flood land of Innermongolia were studied.The community, dominated by Eleocharis intersita, Carex enervis, Agrostis gigantea and mesic forbs, had a high aerial phytomass of 445.64 gDM·m-2, which was 2—4 times higher than the steppe phytomass. The aerial phytomass of Saussurea acuminata mesic forbs meadow and Iris lactea mesic forbs meadow were 3584.50gFM·m-2 and 1444.02 gFM·m-2 respectively. Meadow community had no obvious single edificator species, i. e. the edifocator had the smaller dominance in meadow than in steppe.DCA ordination of the 44 quadrats of the marsh, meadow and steppe communities shows: in the meadow habitats, the mesic forbs meadow occupied the relatively dry sites, the grasses meadow distributed on the moderate humid sites and the Cyperaceae meadow developed on the wet sites. The sites drier than that of mesic forbs meadow were occupied by meadow steppe ,while the sites wetter than that of Cyperaceae meadow are for marsh.
    The Implications of Niche Separation and its Measure
    Yu Shi-xiao, L. Orlóci
    Chin J Plan Ecolo. 1993, 17 (3):  253-263. 
    Abstract ( 2314 )   PDF (555KB) ( 885 )   Save
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    The actual value of a resource state, or alternatively, a resource state′s position along the resource spectrum, is often neglected by empirical niche metric formulae. To remedy this defect, a different niche separation metric formula is needed for measuring species niche dissimilarity. From this approach, the actual value of the resource state is incorporated as a distance from the state to the theoretical niche center in n-dimensional hyperspace. An example from Cryptocarya community in the Dinghushan Nature Reserve, South China reveals niche sparation between species in utilizing soil resources
    A Study on Ca, Mg Content in Aneurolepidium chinense Grassland in Northeast China
    Ge Ying, Li Jian-dong
    Chin J Plan Ecolo. 1993, 17 (3):  264-272. 
    Abstract ( 1751 )   PDF (466KB) ( 672 )   Save
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    The characters of Ca, Mg contents of the Aneurolepidium chinense grassland harvested by cutting in Northeast China were studied. Results showed that: In A. chinense community, the Ca, Mg concentrations of root were the highest among the organs and were higher in the peak growing season than in other time. The seasonal variation curves of Ca, Mg accumulation of the aboveground biomass of A. chinense have a "S" shape, while those of Cares duriuscula and Heleocharis acicularis were bimodal. The Ca, Mg accumulations in the underground part of the community were account for 97% and 92% of the total accumulations of the whole community. The Ca, Mg accumulations in the community were account for 0.05% and 0.03% of the total reserves of the soil, account for 52.20% and 14.62% of the soluable+exchangeable reserves of the soil respectively. The accumulation of Ca in all organs of plant was higher than that of Mg.
    Studies on the Features of Energy Value and the Factors of Affecting Measuring Energy Value of Neosinocalamus affinis Clone Population
    Su Zhi-xian, Huang Yan-ping, Mu De-jun, Xiong Qun-xian, Zhong Zhang-cheng
    Chin J Plan Ecolo. 1993, 17 (3):  273-279. 
    Abstract ( 1865 )   PDF (388KB) ( 1196 )   Save
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    This paper is based on the theory of Harper′s(1977) modular structure, explored the features of energy value and the method of measuring energy value of Neosinocalamus affinis clone population in the surburbs of Nanchong at three levels: the unit of modular construction, the ramet and the clone.In the Neosinocalamus affinis clone population, the mean AFCV of each unit of modular construction is as follows, root 15349.42J/g, rhizome 16372.92 J/g, culm 17106.06J/g, branch 18111.99J/g and leaf 19451.90J/g; the AFCV of the ramets of Neosinocalamus affinis is increasing with age class; the allocation to the total energy (AFCV) at the ramet level are that 1 age class is 16.47%, 2 age class is 25.76%, 3 age class is 36.32%, 4 age class is 13.08% and 5 age class is 8.37%. The changes of the energy value are related to the oxygen pressure in the oxygen bomb calorimeter, which measures thermal value with combustion method at constant volume. The energy value calculated with the experience formula is bigger than with the way of Leiro check curve; It is more accurate if the energy is expressed with AFCV than GCV, and the AFCV is bigger than the GCV.
    The Main Characteristics of the Vegetation and its Impact on the Soil Essence in the Loess Plateau of Northern Shanxi Province
    Zhu Zhi-cheng
    Chin J Plan Ecolo. 1993, 17 (3):  280-286. 
    Abstract ( 1963 )   PDF (492KB) ( 982 )   Save
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    This paper explicates the vegetation characteristics and is representation with data of the soil analysis, destruction of the vegetation cover, which not only influences mechanical corrosion of the soil, but also influences diminution of the value of the important soil essence(orgonic matter,nitrogen, phosphorus, water, etc.) in the loess plateau of northern ShanXi province, it is more unhealthy the limit of diminution is in between 2—7 times under normal conditions; besides this restoration of the vegetation cover not only helps to conserve water and prevent soil erosion, but also essence of the soil essence is developed in good direction, fertility of soil is improved, it is more important. Vegetation cover ererts a physical influence and chemical action on the soil, both are an united process.
    The 17th International Grassland Congress Held In New Zealand And Australia
    Chen Zuo-zhong
    Chin J Plan Ecolo. 1993, 17 (3):  287-288. 
    Abstract ( 1397 )   PDF (170KB) ( 732 )   Save
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