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Table of Content
    Volume 24 Issue 4
    30 April 2000
      
    Research Articles
    Germination, Seedling Survival and Growth of Two Carpinus Species from a Chinese Beech Forest
    GUO Ke
    Chin J Plan Ecolo. 2000, 24 (4):  385-390. 
    Abstract ( 1906 )   PDF (389KB) ( 895 )   Save
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    Carpinus cordata var. chinensis and Carpinus fargesiana are two common shade tolerant species of beech forests in Daba Mountains, China. Seed germination, seedling survival and growth under field experimental conditions were studied in relation to the regeneration. C. cordata var. chinensis seeds have a distinct dormancy of more than one year and mainly germinate in the second and third growing seasons after seed fall. Some of C. fargesiana seeds germinate in the first growing season after seed fall, but most germinate in the second. As the two species often produce seeds in the same mast year every two or three years, emergence of some seedlings in the forest occurs every year. Seedlings survive and grow significantly better under better-lit conditions than in the shady understorey. Fertilization can hasten seedling death especially in the understorey, but can enhance seedling growth in better-lit conditions. Results suggest that the seedlings of both species can persist in the shade of the beech forest canopy, but substantial net growth occurs only under better-lit conditions, such as beneath a sparse canopy or in canopy gaps.
    Effects of Stolon Severance on Growth and Resource Use Efficiency of Sabina vulgaris Daughter Plants
    HE Wei-Ming
    Chin J Plan Ecolo. 2000, 24 (4):  391-395. 
    Abstract ( 1791 )   PDF (418KB) ( 794 )   Save
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    Population Structure and Regeneration of Quercus aliena var. acuteserrata in Shennongjia
    LIU Feng, CHEN Wei-Lie, HE Jin-Sheng
    Chin J Plan Ecolo. 2000, 24 (4):  396-410. 
    Abstract ( 1823 )   PDF (457KB) ( 1130 )   Save
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    Nature of Seed Rain, the Seed Bank and Regeneration of a Castanopsis fargesii Community of Fanjing Mountain
    LIU Ji-Ming, ZHONG Zhang-Cheng
    Chin J Plan Ecolo. 2000, 24 (4):  402-407. 
    Abstract ( 1880 )   PDF (494KB) ( 806 )   Save
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    Diurnal Variations in Gas Exchange of Aspen, Hazelnut,Jack Pine and Black Spruce
    YANG Li-Tao, Timothy J. Arkebauer, Elizabeth A. Walter-Shea
    Chin J Plan Ecolo. 2000, 24 (4):  408-419. 
    Abstract ( 1924 )   PDF (940KB) ( 926 )   Save
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    Measurement of Canopy Respiration in Artificial Acacia mangium Forest in a Low Subtropical Hill Forest Region of Guangdong
    ZENG Xiao-Ping, PENG Shao-Lin, ZHAO Ping
    Chin J Plan Ecolo. 2000, 24 (4):  420-424. 
    Abstract ( 2040 )   PDF (404KB) ( 863 )   Save
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    The total respiration rate of artificial Acacia mangium forest (tree layer) was estimated in low subtropical hill region of Guangdong province. The respiration rate was determined by infra-red CO2 gas analyzer with a large number of detached samples of leaves and woody organs taken from trees of various sizes. Using pipe model theory, the formulas of diameter frequency distribution and the relation of the respiration to its diameter for woody organs were established. Accordingly the formulas for total respiration rate of woody organs and leaves were then given. Results showed that the respiration rate of woody organs was negatively correlated with diameter and the total respiration rate was positively correlated with DBH and height (D2H). The yearly total respiration rate of Acacia mangium forest was calculated to be 47.51 t CO2·hm-2, trunk, branch, leaf and root accounted for 23.1%, 13.9%, 48.7 % and 14.4 % to the total respiration rate, respectively.
    Comparative Analysis of Genetic Diversity in the Endangered Shrub Tetraena mongolica and Its Related Congener Zygophllum xanthoxylon
    ZHANG Ying-Juan, YANG Chi
    Chin J Plan Ecolo. 2000, 24 (4):  425-429. 
    Abstract ( 1817 )   PDF (374KB) ( 918 )   Save
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    Genetic diversity and differentiation in the endangered shrub Tetraena mongolica were compared with those of its relative Zygophyllum xanthoxylon from the same habitat on the western Ordos Plateau using the method of vertical polyacrylamide gel electrophonesis. Allozyme data indicated that both plant species maintained a relatively high level of genetic variation as compared with other shrubs. However the endangered shrub had lower population-level genetic variation, with P(Percentage of loci polymorphic)= 60% and 83.3%, A(Mean No. of alleles per locus) =1.6 and 2.2, He(Mean expected heterozygosity) = 0.245 and 0.392 respectively. Genetic differentiation among populations was low with Gst value being 0.051 and 0.020 respectively. These results confirm that genetic issues are not the same, nor as pressing in all endangered plants, and that conservation strategies should therefore not all be the same.
    Gradient Analysis of the Influence of Mountain Topography on Vegetation Pattern
    SHEN Ze-Hao, ZHANG Xin-Shi, JIN Yi-Xing
    Chin J Plan Ecolo. 2000, 24 (4):  430-435. 
    Abstract ( 1881 )   PDF (494KB) ( 1477 )   Save
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    Quantitative Division of Altitude Belts in Forest Vegetation of Mt. Huoshan, Shanxi Province
    BI Run-Cheng, YAN Gui-Qin
    Chin J Plan Ecolo. 2000, 24 (4):  436-441. 
    Abstract ( 1812 )   PDF (380KB) ( 879 )   Save
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    Ecotone positions on the east and west slopes of Mt. Huoshan, Shanxi Province were identified by calculating edge effects of different sampling regions located at one hundred meters (altitude) intervals. A quantitative division of vegetation types was achieved using these identified ecotones and a cluster analysis of biotypes. The vegetation of the warm temperate broad-leaved forest in Mt. Huoshan in Shanxi Province was subsequently divided into five vegetation altitudinal belts and three subbelts.
    Studies on Community Distributive Patterns of Epiphytic Bryophytes in Forest Ecosystems in Changbai Mountain
    GUO Shui-Liang, CAO Tong
    Chin J Plan Ecolo. 2000, 24 (4):  442-450. 
    Abstract ( 1918 )   PDF (713KB) ( 1130 )   Save
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    DCA and TWINSPAN were applied in this study of the community distribution patterns of epiphytic bryophytes based on the cover of epiphytic bryophytes in different forests in Changbai Mountain. The results showed that the distribution of epiphytic bryophytes is well correlated with forest types. Epiphytic bryophyte communities in this area can be divided into six groups, which are distributed in Larix olgensis forest, Betula ermanii forest, dark conifer forest, transition forests between Pinus koraiensis broad-leaved mixed forest and conifer forest, Betula platyphylla forest and Pinus koraiensis broad-leaved mixed forest respectively. The factors influencing the ecological distribution of epiphytic bryophytes in Changbai Mountain were also analyzed and described.
    Surface Flow in an Acacia mangium Plantation and an Orchard in Heshan, Guangdong Province, China
    ZHOU Guo-Yi, YAN Jun-Hua, SHEN Wei-Jun, HOU Ai-Min, YU Zuo-Yue, LIN Yong-Biao
    Chin J Plan Ecolo. 2000, 24 (4):  451-458. 
    Abstract ( 1879 )   PDF (652KB) ( 1154 )   Save
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    Temporal Variation in Dust Deposition in the Xilin River Basin
    WANG Yan-Fen, CHEN Zuo-Zhong, HUANG De-Hua, HAN Jian-Mei
    Chin J Plan Ecolo. 2000, 24 (4):  459-462. 
    Abstract ( 1733 )   PDF (353KB) ( 833 )   Save
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    Temporal and Spatial Changes in Acidity and Electrical Conductivity of Forest Precipitation
    FAN Hou-Bao
    Chin J Plan Ecolo. 2000, 24 (4):  463-467. 
    Abstract ( 2036 )   PDF (394KB) ( 954 )   Save
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    The chemistry of forest precipitation was monitored for three years at two sites in Chinese fir (Cunninghamia lanceolata) plantations with different distances from a known atmospheric pollution source. Precipitation acidity and electrical conductivity (EC) were significantly elevated upon passage through forest canopies at both sites, and more so especially by stemflow. The average volume-weighted pH values for rainfall, throughfall and stemflow were 6.13,6.06 and 4.18, respectively, at the FFC forest site (further from emission source), and 5.86,5.67 and 3.37 at the XQF forest site. Acidity of rainfall and throughfall showed some seasonal trends,with minimal pH values in summer and maximal in winter. The average volume-weighted EC values for rainfall, throughfall and stemflow were respectively 28.51, 63.71 and 240.85 at FFC, and 36.99,66.41 and 501.85 at XQF. EC values of precipitation exhibited a strong seasonal pattern, with minimal values consistently found in summer months, intermediate in spring and fall, and maximal in winter, a pattern which appeared to be influenced greatly by the pattern of total precipitation. Acidity and electrical conductivity of precipitation at XQF near the emission source were significantly higher than that at FFC, which was relatively unaffected by air pollution.
    Mechanism of Degradation Succession in Leymus chinensis+Stipa grandis Steppe Community
    WANG Wei, LIANG Cun-Zhu, LIU Zhong-Ling, HAO Dun-Yuan
    Chin J Plan Ecolo. 2000, 24 (4):  468-472. 
    Abstract ( 1636 )   PDF (375KB) ( 917 )   Save
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    Study on Effect of Litter Layer on Community in Aneurolepidium chinense Grassland in Songnen Plain
    GUO Ji-Xun, SUN Gang, JIANG Shi-Cheng
    Chin J Plan Ecolo. 2000, 24 (4):  473-476. 
    Abstract ( 1822 )   PDF (332KB) ( 850 )   Save
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    Seasonal change in litter weight and number of germinating plants showed a parabolic form. The peak number germinating was 200g·m-2. Litter effected germination via its influence on surface temperature and soil water. The number of species present in the community increased with increasing litter weight up to a peak value of 800 g·m-2: species saturation occurred at 14·m-2 , then decreased. Changes in the density, average height, coverage and aboveground biomass of dominant species with litter weight were basically similar and each peaked at around 600g·m-2. The litter layer had a strong influence upon the dynamics of community succession. The difference between plots in which litter weight was low was small, while communities diverged as litter weight increased. The changes of aboveground biomass and underground biomass of community with litter weight showed a single peak at 600g·m-2 and 700 g·m-2 respectively. Underground and aboveground biomass both varied with litter weight in a ‘V’ type pattern with the lowest value around 550 g·m-2 .
    Vegetation Development on Tropical Abandoned Fields, Hainan Island, China
    YANG Xiao-Bo, WU Qing-Shu
    Chin J Plan Ecolo. 2000, 24 (4):  477-482. 
    Abstract ( 1965 )   PDF (476KB) ( 906 )   Save
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    The Structure of A Culm and Shoot Producing Stand of Phyllostachys pubescens
    ZHU Jin-Mao, HUANG Mao-Ti, CHEN You-Qiang, HUANG Ru-Zhu, LI Xiao-Qing
    Chin J Plan Ecolo. 2000, 24 (4):  483-488. 
    Abstract ( 1696 )   PDF (426KB) ( 950 )   Save
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    Effect of Plant Density on Microclimate in Canopy of Maize (Zea mays L.)
    LIU Kai-Chang, ZHANG Xiu-Qing, WANG Qing-Cheng, WANG Chun-Ying, LI Ai-Qin
    Chin J Plan Ecolo. 2000, 24 (4):  489-493. 
    Abstract ( 2072 )   PDF (398KB) ( 1350 )   Save
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    The canopy microclimate of two new maize hybrids was studied under high yield condition in 1997-1998, farm-based field experiment in Jinan. Photosynthetic photon flux density (PPFD), CO2 concentration, air temperature, and wind velocity were significantly affected by plant density. The role of microclimate in affecting levels of available stored energy in grain was confirmed, and it is suggested that higher available stored energy could be obtained in grain by adjusting plant density and thereby adjusting microclimate.
    Quantitative Remote Sensing Study of the Cover of a Sand Artemisia ordosica Community
    CHI Hong-Kang
    Chin J Plan Ecolo. 2000, 24 (4):  494-497. 
    Abstract ( 1844 )   PDF (334KB) ( 1049 )   Save
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    Desertification is closely related with the vegetation coverage of sands in the Ordos region. Dynamwith titoring of vegetation coverage of sands using NOAA satellite data can usefully aid in the understanding of the dynamic processes of desertification in the Ordos region. By analyzing the sand reflectance mechanism we built a correlative model between the coverage of Artemisia ordosica community and a modified soil adjusted vegetation index (MSAVI). Satellite data required processing before the application of the correlative model: atmospheric effects were corrected using the bare sand soil line method and soil background effects reduced using the MSAVI.
    The Study of Synthetical Judgement in Many Sides on the Mixed Model of Masson-Pine-Mixed Fores
    HAN Jin-Chun, LI Hong-Kai
    Chin J Plan Ecolo. 2000, 24 (4):  498-501. 
    Abstract ( 1809 )   PDF (347KB) ( 715 )   Save
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    Relative to pure stands, mixed forest of masson pine does better in the storage of timber, the improvement of forest microclimate conditions and the organic matter content of soil. The sequence of superiority of management models is masson pine-Chinese fir mixed forest, followed by masson pine-eucommia (Eucommia ulmoides Oliv.) mixed forest and masson pine-sweetgum mixed forest. This sequence is derived from the quantification and synthetic judgment of economic benefit, ecological effect and the nutrient content of soil among the three forest types. A suggested technique for the selection of an optimal management model is provided.
    Comparative Analysis of Regeneration and Colonization Ability in Five Submersed Macrophytes
    CUI Xin-Hong, XIONG Bing-Hong, PU Yun-Hai, LI Wei, CHEN Jia-Kuan, HE Guo-Qing
    Chin J Plan Ecolo. 2000, 24 (4):  502-505. 
    Abstract ( 1719 )   PDF (317KB) ( 685 )   Save
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    Potamogeton malaianus, P. maackianus, Vallisneria spiralis, Myriophyllum spicatum and Hydrilla verticillata are common dominant submersed macrophytes in lakes of the middle and lower reaches of the Changjiang River. We investigated the regeneration abilities of these five species in growing experiment. The species can be arranged in order of increasing rate of production of asexual propagules: H. verticillata > P. maackianus > P. malaianus > V. spiralis > M. spicatum. Rates of survival of plants were measured at two scales : 1) the whole plant, in which survival of H. verticillata > M. spicatum > P. maackianu > P. malaianus > V. spiralis, and 2) vegetative propagules: H. verticillata > V. spiralis > M. spicatum > P. maackianus P. malaianus. In addition to the fragment of Myriophyllum spicatum, colonization ability (root growth rate) of each species was correlated with its survival rate and the ranks order of colonization ability in the 5 species and their propagules were identical to that of their rates of survival.
    Effects of Doubled CO2 Concentration on Structure of Vascular Tissues of Quercus liaotungensis
    LIANG Er-Yuan, HU Yu-Xi, LIN Jin-Xing
    Chin J Plan Ecolo. 2000, 24 (4):  506-510. 
    Abstract ( 1917 )   PDF (421KB) ( 915 )   Save
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    The structure of secondary xylem and secondary phloem of Quercus liaotungensis grown under conditions of ambient (350 μl·L-1) and doubled CO2 concentration (700 μl·L-1) was investigated. Statistical analysis of results indicated that ring width increased significantly under the CO2-enriched environment, which was 300%–370% of those from plants grown under ambient CO2 environment (CK). In particular, latewood width was affected much more strongly by the treatment. Furthermore, vessel number per square millimeter and radial diameter of vessels of latewood as well as ratio of wood fibers also increased, 150%, 120% and 150% respectively of that observed under CK. Nevertheless, no dramatic change was observed in terms of mean length and tangential diameter of vessels, thickness of cell wall and length of fibers of secondary xylem. In the secondary phloem, mean length and number of phloem fibers and crystalliferous parenchyma cells per phloem fiber band increased in response to higher CO2(p≤0.05). In contrast, width and total cells of secondary phloem formed each year and diameter of sieve tubes were reduced to 82%, 80% and 87% of that of the CK grown plants respectively with increased CO2 concentration. It was concluded that secondary xylem responded positively, while the diameter of sieve tubes and the width of secondary phloem showed a negative response to CO2-enrichment during the experiment.

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