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Table of Content
    Volume 15 Issue 1
    10 January 1991
      
    Research Articles
    Studies on Biomass and Litter Fall of Acacia glauca Community in Xiamen
    He Dun-huang, Lin Peng
    Chin J Plan Ecolo. 1991, 15 (1):  1-8. 
    Abstract ( 1670 )   PDF (491KB) ( 810 )   Save
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    This paper is a report on the studies on the biomass and litter fall of A.glauca community in artificial stand in Xiamen.

    1. The biomass of 5-year-old A. glauca comm. is 81.0t/ha, and the average net productivity is 16.2t/ha·a. Its solar radiant efficient is 0.56%. The extinction coefficient of the stand in autumn is 0.52. This biomass can be expressed by the regression equation as W =a+bD+cD2 in which W is the theoretical biomass; D is the basal diameter;a, b, and c are constants.

    2. The annual litter fall in 5-year-old A. glauca comm. is 7.88 t/ha. The content of the major elements in the falling leaves of A. glauca is (kg/ha·a) 152.1 for N, 32.3 for P, and 26.0 for K, and is higher than those in Pinus massoniana and Acacia confusa locally. The decomposite efficiency of the litter fall is fast.

    A Study on Biomass and Productivity of Larix mastersiana Plantation in Sichuan
    Zhou Shi-qiang, Huang Jin-yan
    Chin J Plan Ecolo. 1991, 15 (1):  9-16. 
    Abstract ( 1895 )   PDF (463KB) ( 703 )   Save
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    In this paper, the biomass and productivity of 22-year old Larix mastersiana plantation at an altitude of 2300m in Wolong Natural Reserve are studied. The biomasses of trees, shrubs, herbs, and dead branches and leaves in L.mastersiana stand were investigated using the “average standard tree”and“divided storeys”methods. The regression equation of the dry weight of each organ of L.mastersiana were derived as WT=0.0422 (D2H) 0.8533; WB = 0.0051(D2H) 0.8933; WBr = 0.0016 (D2H) 0.8519; WL = 0.0048 (D2H) 0.7641;WR = 0. 001 (D2H) 1.0755 The estimated total biomass of L.mastersiana stand is 135.17t/ha, the productivity is 10820.52kg/ha·a. Total aboveground biomass is l13.57t/ha, and the productivity is 8951.63kg/ha· a, in which the percentage of trunks, barks, branches, leaves and roots are 54.84% ,9.76%,15.77%,3.50%, and 16.13% respectively. The biomass percentages of L.mastersiana, shrubs, herbs and dead branches and leaves are 84.02%, 1.01%, 4.44% and 10.53% respectively. The productivity percentages of L.mastersiana,shrubs and herbs are 82.73%,3.17% and 13.86% respectively. Annual litter and drying trees productivity of L.mastersiana stand is 3996.14kg/ha·a, and the percentage is 36.93 %.
    Classification and Ordination of Tropical Limestone Seasonal Forest of Guangxi
    Wu Chun-lin
    Chin J Plan Ecolo. 1991, 15 (1):  17-26. 
    Abstract ( 1864 )   PDF (626KB) ( 950 )   Save
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    Thirty samples of tropical limestone forests in Guangxi were classified into six formations using Two-Way Indicator Species Analysis (TWINSPAN) and these six formations constitute two vegetation types of higher class. The classification results are: Ⅰ. Valley seasonal rain forest:( 1 ) Form. Saraca chinensis + Sterculia nobilis ( 2 ) Form. Horsfieldia hainanensis +Dracontomelon duperreanum. Ⅱ.Limestone hill seasonal forest: (1)Form. Deutzianthus tonkinensis + Acrocarpus fraxinifolius var. guangxiensis( 2 )Form. Cleistanthus petolottii + Vitex annamensis ( 3 ) Form. Cephalomappa sinensis ( 4 ) Form. Cephalomappa sinensis + Burretiodendron hsienmu. The samples were also ordinated using DCA (Detrend Correspondence Analysis) . The first axis of ordination reflected water gradient from wet valley to dry hill. The second axis was shade gradient.
    A study on Geographical Variation of Seed and Germination Behavior of Pinus armandii
    Li Xiao-jie, Xu Hua-cheng
    Chin J Plan Ecolo. 1991, 15 (1):  27-35. 
    Abstract ( 1702 )   PDF (588KB) ( 698 )   Save
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    Seeds of Pinus armandii, collected from 6 different provenances, were studied. The result shows significant georaphical variation strongly correlated to the vegetation zones. Seeds produced from temperate steppe zone (Xunhua, Guyuan)and western subtropical evergreen broad-leaf forest zone (Huidong) were bigger, heavier and less dormant, even non-dormant, while those from warm temperate deciduous broad-leaf forest zone (Lantian) and eastern subtropical evergreen broad-leaf forest zone (Yichang, Jiangyou) were smaller, Lighter and more dormant. Oil content, fatty acid and amino acid compositions of decoated seeds also varied with their vegetation zones. Stratification for 20 days (at 0—5℃) proved to be effective, regardless of seeds’dormancy state.
    Studies on the Biocycling of Nutrient Elements of Tree Layer of Cunninghamia lanceolata Mature Plantations
    Wen Zhao-mu, Liang Hong-wen, Li Yue
    Chin J Plan Ecolo. 1991, 15 (1):  36-45. 
    Abstract ( 1924 )   PDF (641KB) ( 1012 )   Save
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    The total uptake of the ten nutrient elements of 25—28 years old Cunninghamia lanceolata in Guangxi Longsheng county Lilao forest region were 139.278 kg/ha·a, 19.5% of which(was retained by the tree layer, and 48.1% and 32.4% of which were returned to the soil through litter and rain leaching respectively. The ratio of annual return to annual uptake of N, Mg, S, Mn, Zn, B was more than 0.8 for N, Mg, S, Mn, Zn and B, was 0.72—0.74 for P, K, Ca, and was under 0.7 for Cu.The main factors which affect the biocycling of nutrient elements on the tree layer of Cunninghamia lanceolata plantations were the soil depth and the nutrient concentration in soil, and the diameter and height of the tree, etc.
    The study on Seed Rain Change of Stipa grandis Community in the Songnen Plain of China
    Yang Yun-fei, Zhu Ting-cheng
    Chin J Plan Ecolo. 1991, 15 (1):  46-55. 
    Abstract ( 2042 )   PDF (569KB) ( 710 )   Save
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    In light of the field-investigation at the fixed position from 1982—1988, a quantitutive analysis was done on the change of seed rain, and the relationships between the seed rain and water-heat climatic factors in Spipa grandis community was discussed in this paper. There were 46 plant species altogether and 9 of which were constant species in the seed rain of the community. The density of S. grandis which is dominant species was only about 0.3—1.3% in the total density of the seed rain every year. The seed rain density of dicotyledon group was generally about 1.5—13.5 times higher than that of the monocotyledon group, and the perennial group were 0.2—7.4 times higher before 1985,but 0.4—1.0 times lower after 1986 than the annual group in the community. The ratios of hemicryptophytes were usually the highest in life form spectrum of the seedrain plants every year. There was positive correlation of different value between the seedrain densities of both some plant groups and constant populations and the sunshine hours,the accumulated temperature, the rainfall in the earlier-middle growing season, and the rainfall in different periods preceding growing season respectively.
    A Study on Keteleei Ria Davidiana and its Community in Hilly Area in Dangyang of Hubei Province
    Huang Cheng-yi, Wang Wei-duo, Sun Jin-cheng, Chen Rong-hua, Zhou Xin-cheng, Zhang Shi-yan
    Chin J Plan Ecolo. 1991, 15 (1):  56-65. 
    Abstract ( 1970 )   PDF (630KB) ( 710 )   Save
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    This article is a general study on the distribution, origin, change, biological characteristics, law of growth and development, community type, structure, regeneration and succession of Keteleeiria davidiana in Dangyong.A large area of pure and mixed forest in the hilly area at the low altitude of 100—393 m is reported.Keteleeiria davidiana in hilly area in Dangyang was originated 60 million years ago. Without the damage of Quaternary glacier and little disturbance by human in history, it survives until today.The properties of Keteleeiria davidiana is very similar to that of Pinus massoniana. It has easy propagation, good adaptability, and long life. It can grow into big trees. Single tree growth speed are not lower than that of Pinus massoniana. The species has strong germination and regeneration ability, thus several harvests are possible once planted.It is proposed to use the species as an improved timber source fnlarge-scale artificial forests in its adaptable region. However, the specis in now on the verge of extinction, we propose to protect it as grade 3 protectd species.
    The Relation of Distribution Character and Diurnal Changes of Stomata Opening and Closure with Transpiration Intensity of Main Plants in Kobresia humilis Meadow
    Zong Hai-min, Yang Fu-tun, Shen Zhen-Xi
    Chin J Plan Ecolo. 1991, 15 (1):  66-70. 
    Abstract ( 2019 )   PDF (296KB) ( 742 )   Save
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    The relation of distribution, density and diurnal changes of stomatal opening and closure in six plants of alpine Kobresia humilis meadow were studied during May–September in 1986. The results indicate that the leaf stomata of most plants are distributed in both the upper and lower epidermis, but with the K. humilis they are distributed in the lower epidermis, and with the Festuca ovina, they are all distributed in the upper epidermis. The leaf stomata open at 9 am until 3pm and then close gradually. Transpiration intensity of plants varies with the stomata’s opening and closure. The transpiration intensity of K. humilis achieved peak at about 11 am, but Elymus nutans and Saussurea superba at about 1 pm, after which it falls gradually until stops completely sunset. The changes of stomatal opening and closure as well as the transpiration intensity of plants are affected by both air temperture and the relative ambient humidity.
    Studies on the water Conservation Efficacy of Forest in the Land Area Qinghai Province
    He Dong-ning, Wang Zhan-lin, Zhang Hong-xun
    Chin J Plan Ecolo. 1991, 15 (1):  71-78. 
    Abstract ( 1842 )   PDF (467KB) ( 822 )   Save
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    There are six main forest community types in the forest district of the north mountain of Ledu county. The test and analysis of the physical preperties of forest soil, forest litter, water absorption capacity, the infiltration velocity of soil and underground run-off as well as the estimate of the efficacy of water conservation point out that forest community soil of this area contain good efficacy of water conservation. It shows that volume-weight is reduced and porocity is increased. The forest community soil of this area can conserve water about 461—978t/ha. The absorbing water capacity of forest litter is 2.9—7.6 more than its weight. The infiltration velocity of soil is far more than maximum rainfall intensity of this area.
    Effects of Inorganic Nutrition on the Adaptations of Spring Wheat to Drought
    Xu Meng, Shan Lun
    Chin J Plan Ecolo. 1991, 15 (1):  79-87. 
    Abstract ( 1920 )   PDF (539KB) ( 632 )   Save
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    Effects of inorganic nutrition on the adaptations of spring wheat to drought were studied, including the changing process and the degree of osmotic adjustment, the accumulation of free proline, changes of leaf conductance, water loss rate of leaves in vitro, variations of leaf area and water consumption, the root growth and root/shoot ratio. Then, variances of grain yield and water use efficiency (WUE) were discussed. It follows that the effects of inorganic nutrition on the adaptations of different organs and different physiological activities in the spring wheat were not in the same direction: some were benificial to resist drought, others could change the process of a few physioecological adaptations, and still others were detrimental to the drought resistance. Comprehensive analyses explained that increasing yields of dryland crpos with fertilizer are mainly because the need of nutrients in drop growth is satisfied and the root development is promoted as a result of raised WUE, but are not because the drought tolerance of crop plants is significantly strenghened.
    The Gradient Variation of Photosynthetic Ecophysiology on Plateau Type Keny Rice
    Xia Ming-zhong
    Chin J Plan Ecolo. 1991, 15 (1):  88-93. 
    Abstract ( 1904 )   PDF (391KB) ( 900 )   Save
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    The light-photosynthesis and the ecophysiology responese of various kinds of keny typical rice (Oryza sativa subap. Keng Ting) at different altitudes to light and temperature were investigated under field culture and pot culture conditions. The five varieties of keny rice were used. Keng No. 10, Dao No 4, Mei Dan,79-2 and Chu Keng No. 3 altitudes of 2510, 2490, 2400, 2200 and 1850m, respectively. The results indicated all photosynthetic characteristics of keny rice varieties at different altitudes showed apparent gradient variations. Under lower intensity of illumination, the photosynthetic rate at the ear-bearing stage would gradually decrease in Keng rice varieties along with the increase in altitude. Under higher intensity of illumination, however, the rate would gradually increase along with the increase in altitude. The relationships between photosynthesis of Keng rice and illumination could be determined by the curve equations: p=a+blgI, where p is photosynthetic rate, I is light intensity. The light saturation point of keng rice showed a tendency to increase with the rise of altitude. The effects of shading on yield parameters of keng rice at bighter altitudes were much greater than of keng rice at lower altitudes. The plateau keng rice varieties have high coldtolerance when different varieties exposed to low temperature at the blooming stage. The results suggested that different photosynthetic ecophysiology responses to light-temperature were determined by their difference in matabolic pattern and adaptability to the environment.
    Application of the Fuzzy Graph Theory in the Vegetational Regionalism of Shanxi Province
    Zhang Feng, Shangguan Tie-liang
    Chin J Plan Ecolo. 1991, 15 (1):  94-100. 
    Abstract ( 3091 )   PDF (409KB) ( 747 )   Save
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    In this paper, the maximal-tree method of the fuzzy graph theory is applied to the numerical classfication research of vegetational regionalism of Shanxi Province,which is divided into 2 vegetational zones, 6 vegetational regions, 17 vegetational plots. Compared with fuzzy clustering analysis and other methods which are used in plant synecology, the maximal-tree method of the fuzzy graph theory produces tree graph from similar coefficient matrices directly so that it avoids the comples compound calculation of similar coefficient matrices. However, the result is not only more audio-visual, but also more satisfactory, Thus we deem it suitable to apply the fuzzy graph theory to vetetational regionalism.

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