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Table of Content
    Volume 7 Issue 4
    10 April 1983
      
    Research Articles
    Using Plants to Monitor and Evaluate the Level of Sulphur Dioxide Pollution in the Atmosphere of Guangzhou City
    yian Liying, Zhu Tianji
    Chin J Plan Ecolo. 1983, 7 (4):  265-272. 
    Abstract ( 1565 )   PDF (434KB) ( 1070 )   Save
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    Plants were used to monitor and evaluate the atmospheric environment of Guangzhou city in 1981. 18 sites were chosen within the city for monitoring and one site of Nan Hu at the outskirts of Guangzhou was chosen for control. On each site, we sampled four plants species for measuring the sulphur content in their leaves. Sampling were made four times in a year: spring, summer, autumn and winter, inflammation method was adopted.

    The sulphur content index was calculated by the following formula:

    IPC=Cm/Ck

    According to this index, four classes of pollution can be distinguished: Ⅰ.clean (<1.0); Ⅱ. light (1.1–1.5); Ⅲ. medium (1.6–2.0); Ⅳ- heavy (>2.1).

    Evalution:

    1. Comparing by graphic curves, it comes into notice that there were 69 sites among 70 sulphur content index (99%) with higher sulphur content than that of the control. Among the 4 plant species studied, three were found in Li Wan District with maximum amounts of sulphur.

    2. According to classes of pollution 12 (17%) out of the 70 indices belong to heavy. Among 14 indices in Li Wan District, 7 belong to heavy (50%), which means that Li Wall District is one of the serious polluted area by SO2.

    3. Comparing by correlation coefficients, we used the annual mean value of the four plant species as independent variables (x), and that of the atmospheric sample as dependent variables (y). The formula:

    was used to evaluate the correlation coefficients of these four species. The values obtained were 0.27, 0.49, 0.55 and 0.48 respectively. It shows clearly that the x and y are positively correlated.

    The Effects of Lead on Growth of Some Crops and Its Accumulation in Plants
    Xu Hebao, Wang Jiaxi, Xie Mingyun
    Chin J Plan Ecolo. 1983, 7 (4):  273-279. 
    Abstract ( 1999 )   PDF (391KB) ( 1086 )   Save
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    The solution of lead acetate was applied in the soil or spread on the leaves of sweet potatoes and egg-plants grown in pots to investigate its effects, accumulation and translocation within the plants.It was shown that even though very high concentration of lead was treated either in the soil or on the foliage, no visible injury symptoms had been found. It indicated that plants were rather tolerant to lead impact. Lead acetate solution applied in the soil could be absorbed by the roots and most of the lead remained in the roots, and the solutions spread on the leaves could be absorbed by the leaves and most of the lead remained in the leaves. Only a little amounts of lead could be translocated from roots to stems and leaves or from leaves to stems, roots and nontreated leaves. Very little lead was translocated into the fruits of egg-plant and the root tubers of sweet potato especially the edible parts of them (the pulp and starch).
    A Preliminary Study on Caloric Values of Common Plants in Alpine Meadow
    Yang Futun, He Haiju
    Chin J Plan Ecolo. 1983, 7 (4):  280-288. 
    Abstract ( 1662 )   PDF (547KB) ( 1275 )   Save
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    This work has been carried out at the alpine meadow research station of Men-Yuan County, Qinghai. The samples were collected during growing seasons in 1978 and 1980. Caloric values of different plants in alpine meadow were determined by JR-2800 bomb calorimeter. The caloric values of 29 species together with that including seasonal changes of 4 species were determined. Caloric values have been compared not only between various plants of same species but also 4 species at different phenologica phases. Caloric values of alpine meadow plants were higher than average caloric of world terrestrial plants but similar to that of dry meadow plants in Norway and Mt. Washington in America. The average caloric values were 4427.5 cal/g (ash-free, ovendry weight). The seasonal change of caloric values of different plants was different. This is correlated with higher altitude cold climate, ash content, plant phenophase and nutrients. It is found that shrubs have significantly higher caloric values than herbs due to their higher lipid content.
    The Regularities of Formation of Aboveground Biomass of Leymus chinensis’ Population
    Li Yueshu, Zhu Tingcheng
    Chin J Plan Ecolo. 1983, 7 (4):  289-298. 
    Abstract ( 1697 )   PDF (551KB) ( 1049 )   Save
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    Leymus chinensis–one of the most wide spread dominant species in the grassland of northeastern China. In this paper, the regularities of formation of its aboveground biomass was studied. Every year, in early April L. chinensis’ population turned green. Its highest relative growth rate (R), 0.l142g·g-1· day-1, occurred before earing (the second ten days--the last ten days of May)) but its highest absolute growth rate (G), 7.46g· m-2·day-1, appeared during florescence (the second ten days--the last ten days of June). It was found that the R was mainly controlled by the growth regularity of L. chinensis itself, while the G was influenced by the rainfall and temperature of growing season. The aboveground biomass of L. chinensis’ population changes with time and it reaches its highest peak at the growing season. The mean highest value of biomass was 305g·m-2. It occurred during the second ten days of August and then slowly declinded. The aerial parts of L. chinensis’ population all died during the second ten days of October. From our observation, the rainfall in earlier stage (April--July) of growing season was the main limiting factor to the aboveground gross biomass. The height of the peak of its aboveground gross biomass depends on the growth of the biomass of assimilating tissue of L. chinensis’ population. The increase of the aboveground gross biomass positively correlats with the growth of the assimilating tissue (r=0.9472).
    The Classification and Ordination of the Forest Communities of the Jinyun Mountain, Sichuan Province
    Shi Weide
    Chin J Plan Ecolo. 1983, 7 (4):  299-312. 
    Abstract ( 1801 )   PDF (759KB) ( 1316 )   Save
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    The Jinyun Mountain is situated in the northwestern part of Beibei district, Chongqing (29˚54′ N, 106˚29′E). It is possessed of the most typical zonal vegetation-evergreen broad-leaved forest of the mid-subtropics. It falls in the subtropical monsoon climate which is characterized by high temperatures and heavy rainfall in summer, and mildness and a small amounts of rainfall in winter. In the study of the forest communities of the Jinyun Mountain, the sampling technique of the point-centred quarter method was adopted. The numerical classification methods--the tabular comparison of data, the tabular comparison of similarity coefficients, the dendretic diagram and the hier-archical agglomerate--were tried for a comparatively objective classification of the thirteen forest communities of the Jinyun Mountain. The point ordinational chart shows directly the distribution of the thirteen communities. It reflects the gradient variation of the habitat, and correspondingly reflects the pattern in which the gradual transition to the climax communities is contained, namely the successional series of Communities. The evergreen broad-leaved forest is a relatively stable climax community type suited with local environment.All numerical classification methods are only enlightening, quantitative analysis must be closely integrated with qualitative analysis of ecological approach in the study Of the vegetation ecology. This paper is the first attempt to apply this comprehensive analysis to the study of the forest communities of the Jinyun Mountain.
    A Comparison of Three Methods Used in Investigation Evergreen-Broadleaved Forest
    Jin Zhenzhou
    Chin J Plan Ecolo. 1983, 7 (4):  313-329. 
    Abstract ( 1603 )   PDF (932KB) ( 857 )   Save
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    Three methods of vegetation surveying: the point-centered quarter method, counted quadrat method and releve method were used in the investigation of the subtropical evergreen-broadleaved forest of Westhill Kunming. The forest is dominated by Cyclobalanopsis glaucoides. Six sampling lines each with 15 center points were taken to compare with three 400m2 plots of two sets. Workmen are divided into 6 groups, each with the same number and similar skill level. The time taken by each group for accomplishing their work must be recorded so that the speed can be compared. We also compared the amount of work and speed of each group indoor. From this kind of comparison, we arrived at a conclusion that the point-centered quarter method is not a desirable one, at least in investigating subtropical evergreen-broadleaved forest.
    Discussion on Application of Some Plotness Sampling Techniques to Evergreen Broad-leaf Forest
    Wu Zhangzhong, Han Ruozen, Wei Shouzen
    Chin J Plan Ecolo. 1983, 7 (4):  330-337. 
    Abstract ( 1608 )   PDF (515KB) ( 953 )   Save
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    The Mathematical Approach to the Classification of Plant Communities of Subtropical Evergreen Broad-leaf Forest in Zhejiang Province
    Zhang Shen
    Chin J Plan Ecolo. 1983, 7 (4):  338-349. 
    Abstract ( 1579 )   PDF (565KB) ( 751 )   Save
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    Though it is efficient using mathematical approch to the classification of plant communities, yet the general mathematical means does not satisfy the needs of community classification of subtropical evergreen broad-leaf forest. In this paper the author discussed the effectiveness and deficiency of the ’Importance Value’ in naming and classifying the evergreen broad-leaf forest and suggested to adopt the ’Index of Similarity of Spatz (1970)’ combining with the ’Importance Value’ as the basis for classifying the subtropical evergreen broad-leaf forest.
    Comments on Book “Vegetation Geography of China and Chemical Composition of Its Dominant Plants”
    Zhang Shen, Wang Minyuan
    Chin J Plan Ecolo. 1983, 7 (4):  350-351. 
    Abstract ( 1564 )   PDF (156KB) ( 705 )   Save
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