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  • 1986 Volume 6 Issue 1
    Published: 30 January 1986
      
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  • ON THE RELATIONSHIP BETWEEN PRODUCTIVITY OF FISH AND PLANKTON’S QUANTITY IN THE DIKE-POND REGION
    WANG Zenqi, LUO Qilin, WANG Guohan
    1986, 6(1): 1-12.
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    It is especially benefit to bighead carp(Aristichthy nobilis)and silver carp(Hypopthalnaichthys molitrix)in the dike-pond ecosystem of the Zhujiang Delta, which is potimun to the growth of plankton. If the area of a pond is smaller, the kinds and quantities of plankton will not be stable, thus the dike-pond ecosystem has no selfcorrecting homeostasis. To acquire maximum sustained yield of bighead carp and silver carp, the dynamic equilibrium of population between plankton and fish must be kept by controlling the oxygen, fertilizer and forage artificially. In the light of the fact that the monthly amount of plankton and the average month produce rate of fish are synchronous, the author suggests that before the growth season of bighead carp and silver carp coming, the basic quantity of plankton must be increased by artificial controlling, in order to bring every pond's productivity into fully play.
  • ON THE ENVIRONMENTAL SUPERIORITY OF XIZSHUANG BANNA IN RUBBER PLANTATION
    PENG Yongan
    1986, 6(1): 13-17.
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    Xishusng banna is a rubber production base in China. Its fame is only next to that of Hainan. Island. Rubber tree requires a climate with high temperature, high humidity as well as-plentiful precipitation. It also needs calm weather and fertile soil. Considering these conditions, Xishuang banna is one of the most favourable places for rubber planting.
  • THE MOUNTAIN TEMPERATURE INVERSION IN XISHUANGBANNA OF YUNNAN
    GUO Yuqing, ZHONG Shaohuai
    1986, 6(1): 18-22.
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    In Xishuangbanna, take Atuzhai village for example, obvious mountain temperature inversion occurs during the dry season, which lasts for six months. On an average, inversion days amounts to a number of 84 on the south slope and 102 on the north one. The maximum frequency and intensity of inversion occurs in the period from February to April in the dry season, during which the maximum frequency is higher than 70 percent on both slopes, and the mean intensity is +0.4℃/100m on the south slope, and +1℃/100m on the other.
  • MORE ON THE RELATIONSHIP BETiIIOEEN TROPICAL REFORESTATION AND GROUND WATER IN XlAOLIANG, GUANGDONG
    LIU Rinhua
    1986, 6(1): 23-29.
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    The ground water recharge process in forest is mainly affected by the forest regime.Observational data and field test results show further that different types ef a.rtificial forests (eucalyptus forest or mixed broad leaf forest) may change the hydrogeologic condition in forest land. Although soils in the mixed forest and in the eucalyptus forest ate same, but the groundwater sources is rich in mixed forest and poor in eucalyputs forest. As a matter of fact, the percolation intensity of surface water is larger, the penetrability of shallow soil layer is good, so the ground water table is high and there is abundant ground water in the mixed forest.Compared with mixed forest, the eucalyptus forest is characterized as lamer water dissipation, bare and dry forest land, stronger surface runoff and weak water percolation as well as unfavourable supply of phreatic water. Thus it is difficult to form an exquisite forest environment under the eucalyptuses in Xiaoliang.
  • LAND LJSE AND LAND POLICY OF HONG KONG
    ZHENG Tianxiang, LIANG Xuelian, David K. Y. CHU
    1986, 6(1): 30-37.
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    The small areal size of Hong Kong has forced it to pursue at increasing the rate of utilisation of its przcious land. Indeed the which, up.to the 1950s, were thus restricted to the south of the Boundary Street with reclamation as tlic cizief source of nesv land supply. ThP enormous growth of population,number of factories and its expanding economy since the 1960s eventually have led to the construction of new towns in the New Territories on the one hand and abandonment of farmland on the other. The massive construction of public housing with improving designs, however, does not prevent a significant proportion of population from living in mired uses, high density, high rental and highly priced private housing, which also constitutes a subject of criticisms on the Hong Kong land policy.
  • CLIMATOLOGICAL FEATURES OF PHYSICAL SENSATION TEMPERATURE (TEMPERATURE-HUMIDITY INDEX) DISTRIBUTION IN SOUTH CHINA
    WANG Dehan
    1986, 6(1): 38-44.
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    Using ten years'mean temperature and humidity data of 1961-1970, the distribution maps of surface mean Temperature-Humidity Index(THI) of China in January, April, July and October were compiled. The cumulative frequencies of THI at 14 cities in South-China in summer were computed from surface air temperature and humidity observations at 14:00 in the period of 1961-1977. Some features of human physio-climate of China were revealed.
  • REGIONAL CLIMATIC DIFERENCES OF THE SAHARA DESERT
    LIN Hongyue
    1986, 6(1): 45-50.
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    The Sahara is the biggest desert in the world. Its characteristics of climate are high temperature, little rainfall, dry and windy. The Sahara Desert may be divided into four climatic regions: 1.The Northern Winter-rain Region. It may be subdivided into the Mediterranean Coast Province and the Atlas South-foot Province.2. The Southern Summer-rain Region.3. The Western Coast Foggy Region.4. The Central Extremely Arid Region. It may be subdivided into the East central Extremely Arid Province, the Central Highland Arid Province and the west-central Extremely Province.
  • WATER RESOURCES OF SHENZHEN
    CHEN Qinde
    1986, 6(1): 61-62.
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    Subtropical monsoon climate with plentiful rainfall provides abundant water reso urces for the economic development of Shenzhen. But the seasonal variation of precipitation causes a number of difficulties in making good use of such resources. Take account of aforementioned condition, the reservoir constructions for regulate of water should be want. The mean annual rainfall amounts to 1600-2000mm. The runoff depth shifts from 800mm to 1100mm by declining westwards in almost the same way, while the require ment of water resources decreases eastwards. Speaking of water quality, it is excellent, except that of the Shenzhen river which has been seriously polluted by urban sewage.Although the quantity of water can fullymeet demand at present., but will be in short supply by 2000 yr A.D., in that time the population will reach 800,000. Groundwater, which deposits in the granite crack, can be exploited as auxiliary source. Efhcientmeasures must be taken in order to save mater, to effectively utilize local water resources and to improve waetr environment.
  • ON THE STRATEGY OF INDLUSTRIAL DEVELOPWENT IN HAINAN ISLAND
    YANG Ying, ZHOU Jiahui
    1986, 6(1): 63-72.
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    The fpcus pf the wprld economy is shifting to ASPA (Asian and pacific Area) at present. To explpit the respurces anddevelpp the economy of Hainan Island in time, especially to set up an industrial system with distinguishing features, we must both consider its internal and external ppsitipn and draw the lessons of other nations in economic development. The economic development and the establishment of an industrial direction in an area usually are affected by their natural,social-economic, and technical factors. With the comprehensive curves on Hainan, we suggest that its industry system should bebased on the following four departments: the tropical agricultural processing industry, the mining and metallurgical industry and the building material industry, the, oil-erfining and petrpchemicl industry, and the elec-tronic industry.
  • PROMOTE PRODUCTION OF WINTER WATER MELON IN SOUTHWEST HAINAN ISLAND
    XIE Guogan
    1986, 6(1): 73-76.
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    Plantation of winter water melon, which is favourite in oversea markets, is a traditional agricultural production in Hainan Island. The southwestern part of Hainan is located in the tropical zone. Its climate, plentiful sunshine, warm and a little of rainfall in winter, is favourable for winter water melon Along the coastal area in Changjiang, Dongfang, Ledong counties and Sanya, there are widespread undeveloped land can be used for melon cultivation and be built into an important melon production base for exportation. To promote winter water melon production in southwestern Hainan, the following proposes is suggested: I.a great number of talented scientists and agronomists should be organized; 2, emphasizing variety renovation and collection of information from abroad; 3. a transportation and service network should be set up; 4. effective and flexible administrative policies for agricultural products exportation should be adopted.
  • AN EXPERIMENT ON INTERCROPPING RUBBER PLANT AND MEDICINAL INDIANMULBERRY IN HAINAN ISLAND
    LIN Shaolong
    1986, 6(1): 77-81.
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    In order to make full use of the land resources of China's txonical zone, an experiment on setting up multi-level community by intercropping rubber tree and medicinal indianmulberry was carried out. The experiment in Dongping state-farm shouted that intercropping rubbet plant and medicinal indianmulberry was successful, The author describes the agrotechnique and environment in delail. Now is the right time for popularizing this experience.
  • B10GEOCHEMICAL CHARACTERISTICS OF SOME ELEMENTS IN COASTAL REGION IN HAINAN ISLAND
    ZENG Shuiquan, JIN Weigen
    1986, 6(1): 82-92.
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    Coastal region in Hainan Island is divided into two biogeochemical group:Group of Amphibian(Rhizophora apiculata)-salt marshes soil; And Group of Terrestria(Casuarina equiselifolia)-Coastal Sandy soil. The former group is a special ecosystem. It is mainly restricted by oceanic factors A great quantity of salt take part in biogeochemical cycle. Steeping in brine, failed branches and failed leaves on the surface of soil decompose difficultly, so that nutrient stockpile in the bodies of dead organism. It slows down the speed of biogeochemica cycle. The net growth quantities of Rhizophora apiculata increase slowly. Molybdenum, Cadmium, Cupper are reactive among trace elements which take part in the cycle.