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Table of Content
    Volume 13 Issue 2
    10 February 1989
      
    Research Articles
    The Ecological Conditions for Nostoc flagelliforme and their Analysis
    Qian Kai-xian, Chu Hao-ran, Chen Shu-gu
    Chin J Plan Ecolo. 1989, 13 (2):  97-105. 
    Abstract ( 1777 )   PDF (896KB) ( 868 )   Save
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    The ecological conditions of Nostoc flagelliforme in Yongdeng, Gansu and Alashanzuoqi, Neimenggu have been investigated in this paper. The water rhythm phenomenon in the growth of N. flagelliforme was discovered by us.This alga grow in desert steppes with continental climate. The mean annual temperature of such steppes should be 4.5—8℃ and the annual and daily differences in temperature are big and marked about 50℃ for the year and 15℃ for the day. The mean annual precipitation is only 201—290 mm and the mean annual relative humidity 45—58%. There are about 83 days with dewfall in one year. Therefore, the climate of such steppes is Very dry. Their soil shows a strong alkaline reaction, with pH values over 9.0 and contents of organic matters, nitrogen and phosphorus is very poor. However there is plenty of sunshine for the alga in such steppes, totalling 3000±300 hin one year.The growth of N. flagelliforme exhibits an obvious water rhythm phenomenon. From May to October, the dry alga absorbs quickly the water from rainfall or dewfall for its growth in a short duration. The water will beevaporated soon in the sunshine, and the alga will stop to grow and become dry again. The growth process of N. flagelliforme is a successive intermittent growth and accumulation in the rhythm of moisture⇌dry.
    The Reasons of Midday Photosynthetic Depression in Aneurolepidium chinense and Stipa grandis under Sufficient Moisture in the Soil
    Du Zhan-chi, Yang Zong-gui
    Chin J Plan Ecolo. 1989, 13 (2):  106-113. 
    Abstract ( 1807 )   PDF (451KB) ( 911 )   Save
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    This paper deals with the characteristic of diurnal courses of photosynthesis and the reasons of midday photosynthetic depression without lack of moisture in soil for two main community-forming species, A. chinense and S. grandis in a typical steppe zone. The results of research show that the diurnal courses of photosynthesis of these two species are of the highpeak type before noon and their photosynthetic rate at midday decreases certainly. The main reasons for the depressing photosynthesis are the decrease of leaf water content and the stomatal conductance caused by the fall of atmospheric humidity. A secondary effect is the increment of light respiration resulting from the rise of air temperature and light intensity in the midday period. The reduction of CO2 concentration, and the accumulation of photosynthetic product also contribute to photosynthetic depression at midday. Biorhythm has no effect on photosynthetic depression during the midday period.
    Analysis of Ecotypes and their Geographical Distribution of Wild Soybean (G. soja) in the World
    Xu Bao, Lu Qin-hua, Zhuang Bing-chang
    Chin J Plan Ecolo. 1989, 13 (2):  114-120. 
    Abstract ( 1925 )   PDF (387KB) ( 958 )   Save
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    In 1981—1986, the effects of photo-period and temperature on the development of wild soybean (Glycine soja) from various locations, with latitude 24—53˚N, longitude 97—143˚E and altitude 0–2650m, were studied. According to the analytical data of 343 germ-plasm lines (China 292,Japan 32, South Korea 14, USSR 5), seven ecotypes and their geographical regions and thirteen sub-regions were divided. They are: 1. the northern ultraearly-maturing region. 2. the northern early-maturing region. 3. the western plateau early-maturing region. 4. the central medium-maturing region. 5. the central-southern medium-late-maturing region. 6. the south-western late-maturing region. 7. the south-eastern ultra-late-maturing region.
    Influence of Environment Factors on Winter Wheat Stomatal Conductance
    Lu Zhen-min
    Chin J Plan Ecolo. 1989, 13 (2):  121-128. 
    Abstract ( 1817 )   PDF (383KB) ( 610 )   Save
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    This paper gives the results of wheat stomatal resistance influenced by environmental factors. The analysis method used is multiple regression. The results explain that: soil water potential in the root zone is the major factor that influences stomatal resistance. The effect of environmental factors to abaxial stomata and adaxial stomata are different: the abaxial stomatal resistance is mainly influenced by soil water potential, but the adaxial stomatal resistance is mainly influenced by air temperature and air humidity.
    Studies on the Ecological Environments and Adaptability of Introduction of Olive Tree in Hanzhong
    Wang Guang-lu
    Chin J Plan Ecolo. 1989, 13 (2):  129-135. 
    Abstract ( 1936 )   PDF (475KB) ( 985 )   Save
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    The adaptability of introduction of Olive trees in their introduction into the Hanzhong area was investigated regarding to ecological factors. Through analysing the conditions of the main producing areas of Olive trees, we chose several from a lot of ecological factors as follows: the temperature and rainfall in the Hanzhong area, particularly the annum distribution of precipitation, length of solar radiation and soil condition. The result of study showed that particular attention should be given to the drainage in raining season, soil loosening, regualation of pH value and application of calcium, phosphorus, boron etc. and breeding of new cultivars which are particularly suitable to the local conditions of the Hanzhong area.
    A Preliminary Study on transpiration Intensity of Plants in Kobresia humilis Meadow
    Yang Fu-tun, Shen Zhen-xi, Zhong Hai-min
    Chin J Plan Ecolo. 1989, 13 (2):  136-143. 
    Abstract ( 2099 )   PDF (488KB) ( 770 )   Save
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    The present study in transpiration intensity of plants in alpine Kobresia humilis meadows was carried out at Haibei Research Station of Alpine Meadow Ecosystem during the growing season from May to September in 1986.The transpiration intensity of Kobresia humilis and plants of nine other species, the daily courses of transpiration intensity of Elymus nutans and plants of two other species as well as the evapotranspiration intensity of different ground covers in Kobresia humilis meadows were measured by method of cobalt paper. At the same time,meteorological data ewer also recorded.The study results are as follows:

    1. The transpiration intensity of Kobresia humilis and plants of nine other species and their phenological phases, were lower during the early growth period and higher during the growth-development period. In general, the transpiration intensity of plants in alpine meadows is higher due to the special habitat conditions on the Qinghai-Xizang plateau.

    2. The daily transpiration courses of Elymus nutans and plants of other species showed one peak curve at noon or afternoon, due to the longer time opening of the stoma to which is also one of the reasons of the higher transpiration intensity. But on the other hand, the transpiration coefficient is higher and the transpiration ratio is lower of the plants in Kobresia humilis meadows.

    3. The evapotranspiration of different ground covers showed that evapotranspiration with ground cover is higher than that without ground cover (bare land).

    Study on Relationship Between the Structure of Underground Rhizome of Uneven-Aged Planted Fishscale Bamboo Forest (Phyllostachys heterocalada) through the Selective Cutting and its Soil
    Sun Tian-ren, Ye Shao-chuan
    Chin J Plan Ecolo. 1989, 13 (2):  144-155. 
    Abstract ( 1779 )   PDF (618KB) ( 737 )   Save
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    Based on the analysis of fifteen soil profiles and investigation on fifty-nine plots of planted fishscale bamboo of different ages through selective cutting in the Long He area of Shucheng county, Anhui province, the relationship between the structure of underground rhizome, the depth of its extension, the proportion of vigorous rhizome and the principal physical properties and the chemical composition of the soil are studied, and 22 regressive equations are also derived.The result shows that the depth of rhizomatous extension is little related to the thickness of soil but is certainly related to the type of sloi and closely related to zhizome ages. The amounts of rhizome distribution within 20 cm depth and 30cm depth are, respectively, 62.82% and 82.63%. In loam sandy soil with 60–72% sand particles, 16–20% powder particles and 11–18% clay particles the weight of the rhizomes is larger and the proportion of vigorous rhizomes is higher, but the depth of extension in the soil is shallower. In the soil with 1.00–1.20 specific gravity, 43–61% total porosity, 33–46% capillary porosity, 0.46–1.24% content of organic matter in the surface layer of the soil, 0.0080% effective nitrogen, 35ppm effective phosphorus and 45ppm effective potassium, the biomasses of underground rhizomes are higher. In loose, fertile and porous soil the extension of rhizome system is deeper.
    Preliminary Study on the Climatic Productive Potential of Masson Pine Stands in Anhui
    Wan Zhi-hu, Xu Jun, Liu Xian-yin, Zhu Xi-chun
    Chin J Plan Ecolo. 1989, 13 (2):  156-163. 
    Abstract ( 1620 )   PDF (430KB) ( 749 )   Save
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    The solar energy productive potential and the climatic productive potential in masson pine stands were estimated based on Leith model. The analysis of calculated value thus obtained, supported by real biomass determined, shows: (1) the climatic productive potential in low hilly regions of the periphery of Huangshan stands is the highest, and that in the south of hilly lands along Yangtze river and Huaihe river comes second, while that in the districts north of the watershed between the two rivers is the lowest; (2) the biomass production and economic productive potential are 1.3×103–4.0×103kg/ha·a and 2.7–6.3m3/ha·a respectively, while the increament ratio are to 10.8 to 37.8 per cent and 38.8 to 134.1 per cent respectively.
    The Study on the Main Vegetation Types of Guilongshan in Southwest Fujian Province
    Zhou Xiu-jia, Feng Zhi-jian
    Chin J Plan Ecolo. 1989, 13 (2):  164-170. 
    Abstract ( 1870 )   PDF (393KB) ( 889 )   Save
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    The Guilongshan district is situated in southwestern Fujian Province, at 25˚32′N and l16˚07′E. It is bounded on the south by Wuping county and on the west by Jiangxi Province. It is one of the southern most main peaks of the Wuyishan mountain range, with the summit of 1037m. It has a total area of more than 12km.The forest vegetation in Guilongshan district is composed mainly of genus Castanopsis, Elaeocarpus, Mangtietia, Machilus, Schima, Eurya, Rhodomyrtus, etc. The district is basically of evergreen broad-leaved forest, which is the zonal vegetation.The vegetation zone of the Wuyishan mountain range is located in a transition between Holarctic region and Palaeotropical one.
    The Effect of Shading on the Formation and Abscission of Flowers and Pods in the Bean Before, During and After the Flowering Period
    Xia Ming-zhong
    Chin J Plan Ecolo. 1989, 13 (2):  171-179. 
    Abstract ( 1852 )   PDF (529KB) ( 690 )   Save
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    The present paper deals with the effect of shading on the formation and absoission of Vicia faba flowers and pods during the three different periods before, during and after flowering, the capability of yield compensation and the ecologicphysiologie, principle of the formation and abscission of flowers and pods. In our experiments the total number of flowers and pods was reduced in the case of shading before flowering, but the rate of abscission was reduced. The weight of the resulting grain was therefore significantly larger than thar of the treatment of shading of during and after flowering, even larger than the unshaded plants. There was no distinct influence on the total number of flowers of shading before flowering and after flowering, but the ruduction of the grain yield was significantly higher than the unshaded plants. The specific leaf weight, chlorophyll content of the leaves by the end of shading, photosynthetic production, the rate of distributing dry matter to the reproductive organs, the sugar and the nitrogen contents of plants were reduced at various stages of shading, but at mature, the sugar and nitrogen contents and the amounts of nutritive elements (P,K, Ca, Mg)absorbed by the grains, stems and leaf were not affected. The principal reason for flower and pod reduction caused by shading was the decrease of the sugar-nitrogen ratio, and not any change in the abundance of nutritive elements.
    Numerical Taxonomic System for Microcomputer and its Application
    Hu Jia-qi, Wu Wen-yu, Shu Jun
    Chin J Plan Ecolo. 1989, 13 (2):  180-183. 
    Abstract ( 1620 )   PDF (268KB) ( 793 )   Save
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    A Research on the Theory Recognizing Populations of Vegetation from Remote Sensing Images with Computer
    Wang Zheng, Mei An-xing, Liu Shu-ren, Wang Xue-ling
    Chin J Plan Ecolo. 1989, 13 (2):  184-189. 
    Abstract ( 1489 )   PDF (384KB) ( 820 )   Save
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    The Third International Rangeland Congress (IRC) Was Held in India
    Chen Zuo-zhong
    Chin J Plan Ecolo. 1989, 13 (2):  190-190. 
    Abstract ( 1398 )   PDF (66KB) ( 660 )   Save
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    An Introduction to Inner Mongolia Grassland Ecosystem Research Station Academia Sinica
    Zhang Li-he
    Chin J Plan Ecolo. 1989, 13 (2):  191-191. 
    Abstract ( 1985 )   PDF (130KB) ( 681 )   Save
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    A Brief Introduction to《Ecology and Agricultural Development》
    Duan Xian-yuan
    Chin J Plan Ecolo. 1989, 13 (2):  192-193. 
    Abstract ( 1565 )   PDF (160KB) ( 640 )   Save
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    An Introduction to 《The Science of Allelopathy》
    Wang Zhong-min
    Chin J Plan Ecolo. 1989, 13 (2):  194-196. 
    Abstract ( 1449 )   PDF (97KB) ( 544 )   Save
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