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Table of Content

    10 February 1989, Volume 8 Issue 01
    Dynamic Effect of Paulownia on Wheat Growth and Development and Soil Water and Salt Contents
    Kong Lixin, Zhang Jilin, Ni Jingde, Li Changsheng, Li Yude
    1989, (1):  1-4,10. 
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    Data were obtained for wheat growth and development and soil water and salt contents in paulownia-wheat intercropping field. It was indicated that paulownia could reduce the moisture losses from the topsoil of sheltered fields,ameliorate farmland site-conditions and increase wheat production by 6.15—9.25%. The intercropping of paulownia and wheat is profitable to the windy-sandy areas and well-irrigation areas of China.
    A Mathematical Model Estimating the Economic Production of Acanthopanax senticosus
    Zhu Ning, Jiang Hong, Zhang Dahong
    1989, (1):  5-7,13. 
    Asbtract ( 1308 )   PDF (586KB) ( 212 )  
    A mathematic model was set up for estimating the organs-and plant economic production of Acanthopanax senticosus with selected function types and variants such as ground diameter (D) and plant height(H). The optimum estimation model was determined according to the correlation coefficient(r) and surplus standard variation(Sd). The effectiveness of estimation was different for various organs: Stem>Plant>Leaf>Root stem>Root>Leaf stalk.
    Cyto-geographical Study on Polygonatum odoratum
    Fang Yongxin
    1989, (1):  8-10. 
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    Polygonatum odoratum is widely distributed in subtropical and temperate areas of China and temperate areas of Eurasia continent. In this paper, the karyotype and number of chromosomes of P.odoratum in different distribution areas of China are reported to reveal the evolutionary relationships among specimens from different areas. It provides new material for the cytogeographical research of Polygonayum.
    Dormancy Depth of Several North-east China Tree Species
    Tao Dali, Jin Yuehua
    1989, (1):  11-13. 
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    Six tree species were tested for their dormancy depth of seedlings by transfering them periodically from yard into growth chamber and recording the time span from trasfering to budbreaking. Fraxinus mandshurica needed >180 days and Tilia amurensis needed 296 days for breaking the deep dormancy in early October. However, the dormancy was reduced to 15—20 days in the next January. Similar patterns of change in dormancy depth are also reported for other tree species having less dormancy depth such as Magnolia parviflora and Kalopanax septemlobum. The implications of the results are discussed.
    Early-stage Occurance of Medical Important Flies in Southwest Shanxi Province
    Li Zhiquan, Jing Maju, Qiao Hangong, Xue Ruide
    1989, (1):  14-16,21. 
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    Results are presented for a study on the early occurance and age composition of medical important flies in Yuncheng city cf Shanxi province during Nov. 1986 and May 1987. 21 species and 8445 flies (females 6601) were captured in the early spring. The female/male ratio was 3.6. The predominant species were Aldriohina grahami,Lucilia sericata and Muscina stabulans etc. 225 females were anatomized, of which, 84% were un-oviposited, 40% were pregnant. Follicular stages were mostly from Ⅱ to Ⅴ Detinovas stages. These adults were frequently active in fish markets and warmer places. The earliest adults appeared in early Feb. Their occurance was related to the changs of air temperature. Early larvae appeared in the middle of March, breeding in animal wastes. Suggestions were given for the control of flies in the early seasons.
    Analysis on Characteristic Changes of Surface Heat Balance Caused by Sand-Holding Forest at Zhanggutai
    Xing Zhaokai
    1989, (1):  17-21. 
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    According to the observations on the surfaces of sand-holding forest, fixed dune and small-scale remnant of mobile dune in 1984 and 1985, sand fixation and afforestation changed the components of surface heat balance: (1) The surface reflection rate and effective radiation were reduced by 11—19 and 15—19% respectively and an increment of 603.7×108Jm-2 in net radiation was obtained during growing season after the fixation of drifting dunes and the establishment of forests. (2) The distribution of heat on the surface was changed due to sand fixation and afforestation. Sensible heat flux and Bowen ratio were reduced by 6—15% and 0.18—0.44% respectively, but latent heat flux was notably increased by 54—90%.
    Studies on Soil Structure and Soil Fertility in Ridged Paddy Field and Ridged Piscicultural Paddy Field
    Wei Chaofu, Che Fucai, Gao Ming, Deng Chun
    1989, (1):  22-26. 
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    Studies of soil structure and soil fertility in ridged paddy field and ridged piscicultural paddy field were carried out in comparison with traditional waterlogging paddy field in Sichuan province in 1987.Results showed increases in 0.01mm water-stable microaggregates and aggregation coefficient of 0.01mm soil particles. There was a tendency towards increase in mineral-cemented aggregate and deerease in soil potential fertility in ridged paddy field,but in ridged piscicultural paddy field, a significant increase in organic matter and a higher nutrient content and availability were observed because of the increase cf organic material-cemented aggregates,in which,Fe Al-humus cemented aggregates were dominant. With lime application and field sunning after fishing, high yield of rice could be reached without or with little fertilizer application.
    Expectations in Mountain Areas
    Shi Shan
    1989, (1):  27-30,35. 
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    From the viewpoint of theory and practice, making a good management in mountain and hilly areas is the way out for the solution of China’s agriculture. Mountain areas are rich in resources and productive potentials and may produce great economic and ecological benefits if correct policy and reasonable management are practised in these areas.
    Theoretical Approach to the Population Carrying Capacity of Ecosystem
    Jiang Wei
    1989, (1):  31-35. 
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    From the viewpoint of ecological theoretics, the author defines the population carrying capacity of ecosystem as the maximum population amount healthfully sustained by ecosystem when its structure and function remain undistructed. This amount was controlled by the quantity of food energy produced by ecosystem and the ways human beings consume these foods. Mathematical method for the quantitative rescarch of ecosystem’s population carrying capacity was given, by which, a scientific population target could be suggested for the controlling of population.
    Content of “Ecological Effect”and Its Features
    Liang Shuchun
    1989, (1):  36-39. 
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    "Ecological effect" is an important concept of ecological economics, but so far, no explanation has been available and can be accepted generally. This paper gives an essential definition on its content and discusses its features and its difference in industry and agriculture.
    Geographic and Population Ecology of Donkey in China
    Yang Zhai, Hong Ziyan
    1989, (1):  40-42,47. 
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    The number of donkey reared in China has reached to the first place in the world. The eco-geographic distribution is concentrated in 35-44°N latitudes with the Yangtze River as the south boundary and 46°50′N latitude as the north boundary. In the west, it can extend to the Qinghai-Tibet plateau with an altitude of 4000-4500m above sea level. China’s donkey breeds can be classified into three groups in terms of their natural distribution, ecological conditions and body types. Group 1: the small-type donkeys in pastoral areas of western and northern China with body height below 110cm, such as Xinjiang donkeys,Liangzhou donkeys,Xiji donkeys, Mongolian donkeys, and northeast donkeys. Group 2.the large and medium-type donkeys in plain and hilly agriculture areas of central China with body height of 110-130cm and over 130cm such as Guanzhong donkeys, Qingyang donkeys, Jiami donkeys, Dezhou donkeys etc. Group 3: the small type donkeys in plateau and mountain areas of southwestern China such as Sichuan donkeys, Tibet donkeys and Yunan donkeys.
    Evaluation on Ecological Factors in Tea Planting Area of Guizhou Province
    Wei Guoxiong
    1989, (1):  43-47. 
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    As one of the tea-planting bases in China, Guizhou province possesses a great many varieties of tea and complicated ecological environments. This paper attempts to cvaluate the natural factors such as climate, soil and elevation etc. in the area and their influences on the growth of tea trees and quality of tea. Proposals were also suggested for improving the ecological conditions in tea plantation and for tea production.
    Agroecolomic Division of Deqing County in Zhejiang Province
    Zheng Kefeng
    1989, (1):  48-53. 
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    Deqing county is a base county of ecological agriculture researches in the midst of Hang-Jia-Hu Plain. This research is one of the basic researches in the county. In this paper, 26 townships are considered, 14 agroecolomic factors expressing main properties of the units are defined as divisioning factors, and the method of fuzzy cluster analysis are used. The county is divided into three agroecolomic regions. "Ⅰ" is located on the east of the county containing 16 townships, "Ⅲ" is located in the west of the county including 5 townships, and "Ⅱ" is between "Ⅰ" and "Ⅲ" including 5 townships. The value of the method in carrying out the research is also discussed in the paper.
    Amount of Masson Pine Pests in Acid Rain Area
    Yang Jinkuan, Ji Lanzhu
    1989, (1):  54-55,60. 
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    This paper describes the acid rain damage on pinus massoniana and its relationship with the rampancy of periodical pests such as Ips spp. in heavy acid rain areas of Chongqing and Guizhou in southwest China.It could be observed in these areas that the higher acidity of rain results in the greater rampancy of periodical pests and heavier damages on pinus massoniana.