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    Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    A PRELIMINARY STUDY OF THE EFFECTIVE IRRIGATION QUALITY INDEX SYSTEM OF FIELD WATER APPLICATION
    Lu Jingxuan Guan Zhihua
    1992, 7(1): 1-9. https://doi.org/10.11849/zrzyxb.1992.01.001
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    This paper first sets up the concept of the effective irrigation quality index system of field water application. The authors hold that the traditional irrigation quality index system of field water application lacks reasonable theoretical grounds and is inadequate to reflect the relationship between irrigation quality and crop production because it only describes irrigation quality by the depth of water infiltrated through soil surface. It is suggested to study the useful water volume of the total applied water and the effective distribution of this part of water, and then to establish an effective irrigation quality index system of field water application. The con-.cept of the effective irrigation quality index system of field water application and the current achievements in this field are discussed systematically in this paper. At last, the stochastic and timespace problems in irrigation quality index system of field water application are also analysed.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    PROBLEMS OF CHINA'S WATER RESOURCE MANAGEMENT
    Zhang Tianzeng
    1992, 7(1): 10-17. https://doi.org/10.11849/zrzyxb.1992.01.002
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    The water resource management, in the broad sense, involves its assessment, planning, development and utilization as well as its management and protection, etc. Currently the pressing problems about water resource management to be solved are presented as follows: 1. improvement and implementation of water resource laws; 2. reinforcement of management institutions; 3. establishment of feasible plan for water resource; 4. establishment of reasonable price system of water resource; 5. integrated assessment of the benefit of water resource development; and 6. adjustment of the investment policy of water resource exploitation.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    A DISCUSSION ON THE AFFORESTATION ON THE WASTE LAND SUITABLE TO FORESTS IN THE MIDDLE REACHES REGION OF THE YALUTSANGPO RIVER, TIBET
    Liao Junguo, Han Yufeng, Lai Shideng, Chen Yongrui
    1992, 7(1): 18-26. https://doi.org/10.11849/zrzyxb.1992.01.003
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    The middle reaches region of the Yalutsangpo River, or the one river and two tributaries (the Lhase River and the Nianchu River) region, is a major developing and artificial afforestation region. According to our field survey, there are 75 296ha waste land in the region, including 29 911 ha (39.70% of the whole waste land) which are suitable to forests. On the basis of the locality, conditions, the gravel content and other factors, we divide the waste land into 4 locality types and 4 soil types. The largest locality type is the pebble beach, and next are the moving dunes and the sloping fields of drift sand. The major soil type is the sand land. The area of fertile soil is 15.24% of the whole waste land, and the annual increment of the forest on this kind of soil can reach more than 5.5m3/ha. In the same part of the region, the productive capacity of the forest change violently with the gravel content. By our measurement, the difference between the largest and the least growth increment of the volume of Beijing Populus at different gravel content localities can be as great as ninefold. Therefore, soil reclamation is one of the most important problem of afforestation in the region.According to the conditions of the region, the utilization of the waste land suitable to forest is primarily to plant fuel forests and windbreak forests in order to get the benefits of fuel and protection. The development of the waste land suitable to forest may be divided into three steps. During the Eighth Five Year Plan, first we should chiefly levelop the waste land suitable to forest in Aimagang and Jiangdang, grasp the construction of the 3357 projects, dredge the Nianchu River and contruct the forests and grassland zone successively, afforest the waste land and the sand in the Yalutsangpo River valley step by step, levote major efforts to make shelter forest network and make forestry to play a better role in developing the national economy.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    A STUDY OF THE CONSERVATION PLANNING FOR THE RARE AND RISK PLANT SPECIES IN JIANGSU,ZHEJIANG AND ANHUI PROVINCES
    Xue Dayuan, Jiang Mingkang, Li Zhengfang
    1992, 7(1): 27-35. https://doi.org/10.11849/zrzyxb.1992.01.004
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    Based on full field survey and data collection, the conservation planning for the rare and risk plant species in the three provinces is studied. The 65 plant species in the area protected by the state are divided into several groups according to artificial conservation status and plant distributions and aboundances, and several types of the conservation planning are put forward. On the on-ther-spot conservation side, the establishments of six nature reserves, two national parks and more than 40 protection spots are proposed. On the off-the-spot conservation side, it is suggested to set up a multiply off-the-spot conservation network that consists of a regional off-the-spot center, three provincial-level conservation and breeding bases and a lot of small plant transplantation gardens. Furthermore, an "on-the-spot and off-the spot" conservation planning is proposed, which combines the advantages of the two kinds of conservation. In addition, a "naturalizatoin" planning is particularly emphasized, which requires that the artificial breeded populations of the rare and risk plants should be naturalided to their original habitats.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    ANALYSIS OF LAND USE SITUATION AND FORECAST OF ITS DEVELOPMENT TENDENCY IN FUJIAN PROVINCE BY MARKOV CHAIN
    Chen Pingliu Huang Qinglin
    1992, 7(1): 36-42. https://doi.org/10.11849/zrzyxb.1992.01.005
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    The study of land use situation is the important content of studies of the national land regulation and the forestry development plan. Applying the data of Continuous Forest Inven tory (CFI) and Markov Chain theory, the author has established the model of land use forecast, analysed the land use situation, forecasted its development tendency, and put forward the countermeasures of macroscopic control. The study can provide scientific method and basis for land use plan and making policy.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    THE FUZZY SYNTHETICAL EVALUATION OF THE QUALITY OF THE LAND IN THE YELLOW RIVER DELTA
    Xu Xuegong
    1992, 7(1): 43-54. https://doi.org/10.11849/zrzyxb.1992.01.006
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    In view of the complexity of the land itself and the characteristics of the blur existing in land quality evaluation, this paper applies the method of "multistage fuzzy synthetical judgement" in fuzzy mathematics to evaluate the land quality.The quality of the land in the Yellow River Delta can be divided into eight grades and thirteen classes. The result of the evaluation shows that the proportion of high-class land is relatively small, the general quality of the land is relatively low, but the land has potential superiority. In terms of the multi-porpose agriculture, considering the suitability of the land and its coordination with other natural resources we can say that the region possesses the conditions for setting up powerful bases of farming, animal husbandry and fishery.As an exploration of the evaluation method, after analysing and checking the evaluation results, this paper considers that the "fuzzy remark" contains rich quality messages which can well reflect the all-round quality and the main restricting factors, and that the evaluation results have relatively high accuracy. Therefore it is scientific and feasible to use the method of fuzzy mathematics in evaluating the land quality.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    EXERTING THE SUPERIORITY OF RESOURCES IN HAINAN AND EXPLOITING AND CONSTRUCTING THIS GREAT "OCEANIC PROVINCE
    Pan Jiangang
    1992, 7(1): 55-63. https://doi.org/10.11849/zrzyxb.1992.01.007
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    Hainan, the second largest island and the biggest Special Economic Zone of China, is rich in natural resources and has long been known as the "Tropical Treasure Island". However, due to a variety of reasons, its superiorities have not yet been brought into full play for many years. In order to rapidly develop the economy of Hainan and open it to the outside world, based on objective analysis and comprehensive consideration of its tropical crop resources, mineral resources, tourism resources and marine resources, the author has put forward a new strategy conception to exploit and construct this great "oceanic province", and discussed the strategic target, strategic steps, strategic key-point and so on.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    DISTRIBUTION CHARACTERISTICS OF THE WEATHERINGCRUST-TYPE RARE-EARTH RESOURCES IN NANLING, CHINA
    Huo Mingyuan
    1992, 7(1): 64-70. https://doi.org/10.11849/zrzyxb.1992.01.008
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    Based on the research on the distribution characteristics of the weathering-c rust-type rare-earth resources in Nanling in term of their elements, reserves, age, structure and geography, the author comes to the conclusion that the granite weathering-crust-type rare-earth resources predominate the weathering-crust-type rare-earth resources in the region and their Characteristics are high in element abundance, big in reserves, new in age, simple in tectonic conditions and wide in geographical distribution. Besides, there is. also occurrence of rare-earth minerals in the weathering crusts of volcanic rock and phyllite, thus negating the traditional concept that all the weathering-crust-type rare-earth minerals in Nanling are formed after the weathering of granites and broadening the ore-finding scope and the prospective reserves of rare-earth resources.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    RESEARCH ON THE POTENTIAL AGRICULTURAL I PRODUCTIVITY OF CHINA WITH THE HELP OF GIS
    Leng Shuying
    1992, 7(1): 71-79. https://doi.org/10.11849/zrzyxb.1992.01.009
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    This paper makes a study of the distribution of the potential agricultural productivity of China with the help of geographical information system (GIS).On the basis of the researches of others, the writer chooses appropriate mathematical model and parameters, collects meteorological data of 30 years (1951-1980) and distribution data of physical and chemical characterastics and nutritions conditions of zonal soils (or large-area soils) of China, creates a data base, calculates the potential agricultural productivity of China, and draws a series of maps. The work is with the help of ARC/INFO system, a software of GIS.This paper analyses all the factors influencing potential agricultural productivity. They are sunlight, temperature, water condition and soil condition. The soil condition is analysed by a new method that uses eight factors, namely, soil texture, pH value, nitrogen content, phosphorus content, potassium content, organic matter content, soil erosion status and soil alkalinity status, classifying each of them and giving every class a mark so as to know the soil condition of a region and to calculate its soil availability coefficient.This paper also devides the potential agricultural productivity of China into 9 classes and describes their distribution.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    THE PLANTING STRUCTURE OPTIMIZATION MODEL IN THE SALT-FRESH WATER REGION
    Liu Chunping
    1992, 7(1): 80-90. https://doi.org/10.11849/zrzyxb.1992.01.010
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    In the salt-fresh water region an optimization planting structure model is developed by combinning the groundwater control system with the cropping system. The object of this model is to maximize the net benifit of the crop production under the restrictions of water, soil resource, and so on. This model has been applied to determine the schemes of the planting structure optimization in Nanpi County for the years 1985, 1990, 1995, and 2000.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    A PREL IMINARY STUDY OF PLANT RESOURCES IN THE SHONGSHAN MOUNTAINS IN HENAN PROVINCE
    Ye Yongzhong
    1992, 7(1): 91-96. https://doi.org/10.11849/zrzyxb.1992.01.011
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    Shongshan Mountains are the famous tourist landscape, the second national forest park of China. Based on the in vestigation for several years, the statistical ma terial shows that there are 147 families, 633 genera and 1411 species (included va-rity) in Shongshan Mountains. The author studied and analysed the floristic element. According to the resource characteristics, the plant resources can be classified into 11 kinds.Among them, there are commercial plant 338 species, fruit plant 89 species, ornament plant 316 species, starch plant 94 species, oil-bearing plant 153 species, fibre plant 147 species, medicinal plant 1046 species, forage grass plant 303 species, fragrant oil plant 71 species, tanning material and dvestuff plant 149 spe-cies, poisonous plant 44 species.According to the characteristics of Shongshan Mountains, we make several suggestions about how to develope utilize and protect plant resources:1.To protect ancient plant, rare plant and natural landscape.2.To make full use of dominant plant resources, raise economic benefits.3.To devote major efforts to developing native land plant, protect vegetation lanscape, promote the positive succession of plant community and the fine cycles of the ecosystem.4.To introduce ornament plant in the neighbourhood, beautify the environment of tourist landscape.5.To develope the scientific study and scientific popularization of the forest park.