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Table of Content
    Volume 14 Issue 3
    10 March 1990
      
    Research Articles
    The Characteristics and Classification of Oak Durisilvae in the Himalayan Region of China
    Yang Qin-zhou
    Chin J Plan Ecolo. 1990, 14 (3):  197-211. 
    Abstract ( 1788 )   PDF (834KB) ( 564 )   Save
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    The present paper deals with the oak durisilvae in the Himalayan region of China,, about its main characteristics and classified system.According to the characteristics of the A-shaped climatic diagrams of the meteorological stations in oak durisilvae region, the oak durisilvaeis regarded as the durisilvae of forests of the summer-rain region, which is different from the durisilvae of forests of the winter–rain region of U-shaped climatic diagrams of the world.According to the flora and ecological environment of the oak durisilvae, which is neither the subtropical laurisilvae nor the Mediterranean durisilvae,but is an endemic summer-rain durisilvae of the Himalayan region of China, and is often the climatic community of southern slopes in, the alpine region of west China.According to the dominant tree-species and the altitude, climate, soil, and associated tree-species, the Chinese oak durisilvae is classified into ten formations and two formation groups. The classified system is as follows.

    Vegetation type: Durisilvae

    Formation class: Durisilvae

    Formation group: Subalpine oak durisilvae

    Formation: Quercus aquifolioides forest

    Quercus pannosa forest,

    Quercus gilliana forest

    Quercus longispica forest

    Quercus guayavaefolia forest .

    Formation group. Mountain oak durisilvae

    Formation. Quercus semecarpifolia forest

    Quercus pseudosemecarpifolia forest

    Quercus senescens forest

    Quercus cocciferoides forest

    Quercus franchetii forest

    On the Distribution Pattern of Weed Communities of Summer Crop Fields in River valley and Hilly Lands of Anhui Province
    Qiang Sheng, Li Yang-han
    Chin J Plan Ecolo. 1990, 14 (3):  212-219. 
    Abstract ( 1999 )   PDF (424KB) ( 799 )   Save
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    Weed communities are classified with the quantitative analysis so as to avoid some possible subjective factors in the classification, description and distribution of weed communities; therefore, it is possible in this way to make the study comprehensively, objectively and quantitatively.

    In summer crop fields of river valleys and hilly lands of Anhui Province, 74 sampling fields were chosen to take 10 sampling plots, i.e. 10 plots were randomly selected from these fields. Transformed into overall values, the data collected by eyesight of weed damages to crops in seven scales were analysed with the fuzzy cluster. On the basis of ecological factors and community features of the sampling sites, the degree of confidence was selected and the sampling sites were classified into various clusters. The result showed that the distribution o[ weed communities in rape and wheat fields of the said areas is restrictly influenced by crop rotation systems and soil types. The distribution pattern of weed communities was described as follows, the Cerastium viscosum + Veronica persica association is in the grey muddy soil dry lands of the rotation of wheat (or rape) and cotton; the Galium aparine var. tenterum+Avena fatua association, in the yellow-red earth or yellow-brown earth dry lands of the rotation of wheat and sweet potato (or soybean or cotton); the Alopecurus aequalis association, in the rice soil fields of the rotation of rape and rice. In order to evaluate the weed damage degree to a crop in a type of weed community, the overall weed damage index (OWDI) was first developed. As a result, the worst weeds in the fields of different crop rotation systems and soil types were determined quantitatively in accordance with this index. Finally, the strategy for integrated control of the worst weeds was suggested.

    The formula of the overall value and the overall weed damage index (OWDI) is

    Overall Value=Σ (Number of a scale′s· Value of the scale occupying fields)/50

    OWDI =Σ(Number of a scale′s occuppying·Value or the scale fields)/ Total number of fields of weed community cluster·Value of the highest scale

    Cutting Level Determination in Fuzzy Dtrect Clustering and its Application to Ecological Data Analysis
    Gao Qiong
    Chin J Plan Ecolo. 1990, 14 (3):  220-225. 
    Abstract ( 1670 )   PDF (299KB) ( 679 )   Save
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    The assumption underlying all clustering analyses of vegetation community data is that the plants and the related environmental quantities are distributed either discontinuously or with very steep gradients. In particular, the direct clustering under the theory of fuzzy sets starts with the definition of a fuzzy relation matrix according to attributes of the units to be clustered, and then make a number of cuts into the fuzzy relation to construct a hierarchical clustering system. Therefore the selection of appropriate cutting levels is decisive to the final clustering result for given fuzzy relation. The determination of cutting levels up to date is more or less a subjective or trial-error-trial process. Hence certain subjectivity or arbitrariness is inevitably involved in the final clustering result. The author think that the cutting levels should be determined according to the data being analyzed to reflect the structural properties of the data set. Specifically the cutting level should be set in those places where the greatest variations of fuzzy relation are found. This principle has been implemented in a general-purpose software with sample analysis showing the expected results.
    Studies on Biological Productivity of Artificial Forests of Dahurian Larches
    Ding Bao-yong, Liu Shi-rong, Cai Ti-jiu
    Chin J Plan Ecolo. 1990, 14 (3):  226-236. 
    Abstract ( 1960 )   PDF (594KB) ( 677 )   Save
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    A preliminary research on the sociological characteristcs, plant biomass and productivity of artificial forests of Dahurian larches at an elevation of 300--350m in the Maoershan area of Heilongjiang Provance is presented here. By using "average standard tree" and "divided storeys" methods, the biomass and production of the trees, undergrowth, living plant covers and dead branches and fallen leaves were observed.The different arrangement patterns of Dahurian larches could produce different sociological characteristcs and biological production. The estimated total mean biomass of L. gmelini plantation communities was 159.445, t/ha, the net production was 12.237t/ha·a. The total mean biomass and net production of tree layers was 149.560t/ha and 9.627t/ha·a. respectively. The biological production of the larch stands depended. on the coverage of tree layer, leaf area index(LAI), leaf biomass and efficiency of leaf. Within a certain limit, the coverage of the tree stories decreased from 90% to 70% and at the same time, the LAI of the stand increased from 3.07 to 6.66. The net production of the stand and the tree layer would increase by 105.28% and 30.89% respectively.
    Compararive Studies on Biomass and Productivity of Pinus tabulaeformis Plantations in Different Climatic Zones in Shaanxi Province
    Xiao Yu
    Chin J Plan Ecolo. 1990, 14 (3):  237-246. 
    Abstract ( 1922 )   PDF (751KB) ( 726 )   Save
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    Based on the investigation in 7 research regions of 3 zones in Shaanxi Province, the biomass and productivity of P. tabulaeformis plantations were studied, The research materials of 295 felled trees in 55 sample plots became the basis of the establishment of the estimation equations for the biomass of each organ of P. tabulaeformis. The correlation coefficients of most equations were more than 0.90, and the precision was more than 90% (95% reliable level). The standing crops, average net primary production. current net primary production and dry-matter production efficiency of leaves in different climatic zones were studied and compared. The results show that the stands studied in to Qinling Mountains are superior to those in Northern Shaanxi, the main production indices of stands in the subtropical zone differ insignificantly with those in the south temperate zone, but were higher than those in the temperate zone. There is a decreasing trend in the proportion of stem (with bark) biomass from south to north, and a reverse trend in the biomass of the tree crown. The kinds of plant species under the studied stands were found not rich, their biomass accounting for approximately 1% of whole biomass of the community. The litter biomass differs very much among the studied areas and the proportion of duff biomass decreases from south to north. By comparing P. tabulaeformis plantations in Shaanxi Province with those in other provinces, we could see that the productivity level was higher in former.
    A Remote sensing Image Analysis of the Vegetation Structure of the Xilin Gol Steppe in Inner Mongolia
    Sun Xue-feng, Zhang Zhen-wan, Yong Shi-peng
    Chin J Plan Ecolo. 1990, 14 (3):  247-257. 
    Abstract ( 1802 )   PDF (752KB) ( 728 )   Save
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    This paper is analysed the ecological relationship between the spatial structure of each vegetation level (large, medium, small, fine) of the Xilin Gol Steppe in Inner Mongolia and the corresponding environmental factor by analysing their remote sensing images. The ground biomass and the theoretical livestock-carrying capacities of each vegetation type are estimated. The results show that the separation tendency of vegetation of Xilin Gol Steppe is clear, the large structure of vegetation is determined by large climatic factors, and large geomorphologic unit, and the landform and hydrological network are the primary factors affecing the medium structure of vegetation, but the small and micro structures are controlled mainly by local landform,surface water, matrix and human activities.
    A Correlative Analysis Between Spectral Reflectance and Yield of Grassland on Xilingol,Inner Mongilia
    Wang Yan-rong, Yong Shi-peng
    Chin J Plan Ecolo. 1990, 14 (3):  258-266. 
    Abstract ( 2085 )   PDF (515KB) ( 788 )   Save
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    This paper describes the spectral reflectance characteristics of herbaceous vegetation of grassland of Xilin Gol, Inner Mongolia and analyzes the correlation between reflectance of different band and yield of grassland. Some models for grassland yield estimation have been made using six different kinds of ratio-indexes or perpendicular indexes of vegetation. The accuracy of every model has been tested. It was found that G. ND and PVI may successfully be used for yield estimation of grassland with error less than 10%.
    A Study on the Productivity of Secondary Shrub Thicket and Shrub-Grassland in Yixian County,Anhui Province
    Jin Xiao-hua, Liu Hong-gang, Song Yong-chang
    Chin J Plan Ecolo. 1990, 14 (3):  267-274. 
    Abstract ( 1869 )   PDF (418KB) ( 584 )   Save
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    This paper deals with the primary productivity of subtropical secondary shrub thickets and shrub-grasslands in Yixian County of Anhui Province. By using direct harvesting method, the aboveground productivities of six samples of shrub thickets, two samples of shrub-grasslands and one sample of evergreen broad-leaved young forest in the county were measured.The study results show. the productivities of the evergreen broadleaved young forest, the secondary shrub thickets and the shrub-grasslands were 11.94, 6.84 and 3.80 t/ha·a-1 respectively. By comparing with other community types, the productivity of the secondary shrub thickets and shrub-grasslands are lower, and they are less efficient in using the abun- dant natural resources of heat and water in the subtropical zone. The following regression equation was derived from the correlation of the biomass and net productivity of the nine samples: Y=4.27+0.15x, and it shows thar net productivity increases with biomass.
    The Shell Mounds in North Shandong Province and Shell Mound Vegetation
    Gu Feng-tian
    Chin J Plan Ecolo. 1990, 14 (3):  275-280. 
    Abstract ( 2019 )   PDF (391KB) ( 907 )   Save
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    The shell mounds in North Shandong Province and the shell mound vegetation have not been studied systematically in the past. This article is an explanation of the development of the shell mounds of North Shandong province on the basis of the distribution of shellfich in the shallow Bohai Sea, the fluctuating rise and fall of the sea surface in the Holocene, and the hydrological dynamics of the Yellow River and the sea. Furthermore, this article gives a brief description, under this particular circumstance, of the components, the characteristics of ecotype, the exterior structure, and the systematic types of the vegetation.
    A Preliminary Study of Effect of Soil Water Deficit on the Photosynthetic Characteristic of Faba Vean (Vicia faba)
    Xia Ming-zhong
    Chin J Plan Ecolo. 1990, 14 (3):  281-286. 
    Abstract ( 1906 )   PDF (347KB) ( 580 )   Save
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    The effects of soil water deficit in different stages of reporductive growth on the photosythetic organs, photosynthetic rate and photosynthetic products of faba bean (Vicia faba), cultivar Xichang Dabai were investigated in a pot experiment. The experiment was conducted with six treatments of irrigation (Control) and drought at bud to initial bloom, initial bloom to full bloom, full bloom to initial pod, initial pod to full pod and full pod to plump pod stage.The results indicated that total photosynthesis, net photosynthesis. Chlorophyll content, leaf area, stomatal width, biomass and grain yield were decreased by all the soil drought treatments, but stomatal density and respiratory rate were increased. The light saturation point of droughty leaves was decreased from 50kLx to 30kLx, and the stomatal open of droughty leaves was 9--10 hour. The plant response at different growth stages to soil drought treatment was different. The plant of soil drought at the bud appearance to initial bloom stage was less affected, but the plant at initial pod to full pod stage was most sensitive to soil drought treatment. When the faba bean was dried at the stage, the biomass and grain yield per plant were reduced by 32.0% and 44.9%, respectively. The decreased level of the photosynthetic characteristic at different growth stages by soil drought treatment agrees with the level of biomass and grain yield. These results suggest that the initial pod to full pod stage is the critical moisture point of faba bean.
    A Preliminary Study of Spore-Pollen Society and it’s Development Process to T302 Pole Section,in Liuhe,Jilin
    Wang Pei-fang, Xia Yu-mei
    Chin J Plan Ecolo. 1990, 14 (3):  287-292. 
    Abstract ( 1646 )   PDF (367KB) ( 793 )   Save
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    Through the spore-pollen analysis,14C dating, remain analysis to the T302 pole section, in Liuhe County, Jilin Province, it was found that the peat of the pole bottom belonged to first development stage (low peat) in the early Holocene. From the bottom upward to the top part, medium peat and high peat were found, The paper discusses the law of development of peat.
    An Introduction to the Centre of Functional and Evolutive Ecology (C.E.P.E./C.N.R.S.)
    Li Yong-hong
    Chin J Plan Ecolo. 1990, 14 (3):  293-295. 
    Abstract ( 1484 )   PDF (179KB) ( 504 )   Save
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    The Use of Geographic Information System (GIS) Technology for Compiling Ecologlcal Map
    Pan Dai-yuan
    Chin J Plan Ecolo. 1990, 14 (3):  296-296. 
    Abstract ( 1418 )   PDF (83KB) ( 687 )   Save
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