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    25 March 1997, Volume 12 Issue 1 Previous Issue    Next Issue
    Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    VARIATIONS OF SEDIMENT CHARACTERISTICS IN THE MIDDLE REACH OF YELLOW RIVER WITH RESPECT TO REGIONAL WATER AND SOIL CONSERVATIONSⅠ. Sediment Size Distributions
    Ni Jinren, Han Peng, Zhang Ren
    1997, 12 (1):  1-9.  doi: 10.11849/zrzyxb.1997.01.001
    Abstract ( )   PDF (287KB) ( )   Save
    Special attention has been paid, in the present study, to the variations of suspended sediment size distributions in the tributaries as well as in the main stream within the middle reach of Yellow River with respect to regional water and soil conservations and the human activities. It is revealed that the conservations of water and soil in various catchments between Hekou and Longmen have significant impacts on the sediment size distributions in their corresponding rivers, and principally reduce median diameters of the grain groups. The sediment distribution functions in the study area are found to be controled by both the geomorphologic factors and the types of conservation activities in addition to the hydrological/hydraulic effects. For the hilly ground in Loess Plateau, the sediment size distributions in the rivers are fairly presented by the normal distribution with two important parameters, median grain diameter and the mean square deviation, which are altered by the specific mechanical practices and the landforms, respectively. For the sand gravel hilly ground, a Pearson Ⅲ type function is a good approximation for the sediment gradings, with three parameters altered by the conservation measures. The topic presented herein is of great value but is rarely approached in the previous studies. The applications of the findings are discussed in greater details in the companion paper.
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    FRAGILITY OF MOUNTAIN ECOSYSTEM AND DESERTIFICATION
    Zhou Jingson
    1997, 12 (1):  10-16.  doi: 10.11849/zrzyxb.1997.01.002
    Abstract ( )   PDF (276KB) ( )   Save
    Desertification has become a global social environmental problem and is closely related to fragile ecoenvironment. From the viewpoint of landscape, mountain system lies in the agriculture forest cross zone. The fragility of its ecosystem shows on many hands, such as inner fragility, dependence on vegetation, transition of landscape, backward productive force, etc. Desertification is relatively severe. In this paper, by analyzing the hillside cascade system and the inner feedback mechanism of the system, the operating mechanism of mountain desertification is discussed and furthermore some thoughts about the prevention and control of desertification are raised.
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    A STUDY ON THE EFFECTS OF THE UTILIZATION WAYS OF WASTE HILLSIDES OF THE HILLY REGION IN THE MIDDLE PART OF SICHUAN PROVINCE ON SOIL EROSION
    Jiang Wanqin, Zhang Xinhua
    1997, 12 (1):  17-22.  doi: 10.11849/zrzyxb.1997.01.003
    Abstract ( )   PDF (185KB) ( )   Save
    The area of the waste hillsides of the hilly region in the middle part of Sichuan Province occupy a considerable proportion of that province. Preventing and curing soil erosion and rationally utilizing the water and soil resources, play an important role in developing the local economy. In this paper, through mesh point observation the reasonable utilization ways are explored. This provides a policy making basis for the development and utilization of the waste hillsides.
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    THE INFLUENCES OF PRECIPITATION RESOURCE ON GRAIN CROP YIELD IN DRY AREAS OF WESTERN HENAN PROVINCE AND THE COUNTERMEASURES
    Li Kehuang, Zhong Zhaozhan
    1997, 12 (1):  23-28.  doi: 10.11849/zrzyxb.1997.01.004
    Abstract ( )   PDF (203KB) ( )   Save
    This paper quantitatively expounds that the precipitation resource is one of the important factors that affect the fluctuation of the grain crop production in the dry areas of Western Henan Province. On the basis of the calculation results of crop water surplus and shortage during various growing periods and the critical period of water requirement in normal precipitation years, high precipitation years and low precipitation years of 19 counties or municipalities in Western Henan Province, the basic law of the influences of precipitation resource on grain crop production in dry areas is revealed. According to the randomness of water variation and the option of cropping system in dry areas, the macro countermeasures that use the geographic risk policy making and practise the water adaptability planting are expounded in this paper.
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    THE RESTORATION AND PROTECTION OF THE WINDDISASTER INTERFERED AREA ON THE WESTERN SLOPES OF THE CHANGBAI MOUNTAINS
    Hou Xiangyang, Han Jinxuan
    1997, 12 (1):  29-34.  doi: 10.11849/zrzyxb.1997.01.005
    Abstract ( )   PDF (315KB) ( )   Save
    he interference of the catastrophic wind disaster occurring on the western slopes of the Changbai Mountains results in tremendous losses of the forest resources of the Changbai Mountains natural reserve on one hand, and creates a new problem of how to strengthen protection and accelerate restoration on the other. The authors study the regeneration pattern and process and the relevant problems about the post interference management and set forth the protection methods of speeding up the regeneration and restoration from the site and landscape levels.
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    THE BASIC WAY OF IRRIGATION FOR RESISTING DROUGHT AND SUPPLEMENTING SOIL MOISTURE IN THE PLATEAU COLD AREA OF BASHANG, FENGNING COUNTY, HEBEI PROVINCE
    Li Jiexin, Cai Jinshan
    1997, 12 (1):  35-41.  doi: 10.11849/zrzyxb.1997.01.006
    Abstract ( )   PDF (225KB) ( )   Save
    China is the country having many plateaus in the world. On the plateau surface, the land resource is abandant, but the agricultural development is puzzled by long term drought and water shortage. The current productive level here is low. During the period of the eighth five year plan, the adoption of semi removable spray irrigation has succeded. The unit area grain yield can increase from present 750 kg/ha to 5 250 kg/ha. The investment cost can be returned in one year in respect of most grain varietis. Enomous potentials of grain yield in the area are of special significance to the short supply trend of China's grain production.
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    A STUDY ON THE RIDGE TROUGH CULTURE OF BUSH MULBERRY ON STEEP SLOPING LAND
    Li Zilian, Wu Yuanju
    1997, 12 (1):  42-46.  doi: 10.11849/zrzyxb.1997.01.007
    Abstract ( )   PDF (162KB) ( )   Save
    The study results of the ridge trough culture of bush mulberry on steep sloping land show that the calamities of soil erosion are prevented. In comparison with the contrast area, at the depths of 50cm and 100cm, the soil water content of the managed land is 10. 20%~33. 67% and 8. 27%~65. 37% higher respectively, the total N is 90% of the contrast area, the total P is 2. 9% and 26. 2% higher respectively, the total K is 3. 18% and 8. 01% higher respectively, the hydrolysed N is 61. 5% of the contrast area, the available P is 39. 02% and 97. 72% higher respectivley and the available K is 91. 48% and 92. 54% of the contrast area respectively. The per heatare leaf and cocoon production is 5~10 times higher than that of the contrast area. The economic benefit is 11. 88 times higher than that of the contrast area.
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    A STUDY OF THE LAND GRADE SYSTEM OF THE AGRICULTURAL RECLAMATION TOWNS OF THE XINJIANG PRODUCTION AND CONSTRUCTION CORPS
    Zhou Yinkang, Xu Mengjie, Peng Buzhuo
    1997, 12 (1):  47-54.  doi: 10.11849/zrzyxb.1997.01.008
    Abstract ( )   PDF (250KB) ( )   Save
    In this paper the urban land grade system of the Agricultural Reclamation Towns (ARTs) of the Xinjiang Production and Construction corps (XPCC) is set up. The system includes the categories, grades and ranks of land and the datum land price. This work provides a scientific losis of the land management of different levels for ARTs of XPCC, and has comparatively good theoretical and practical research significance to deepening the reform of the land use with compensation system of China, establishing the reasonable land market, and making the land resource a property.
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    ON THE STATE STRATEGY FOR THE PROTECTION OF GENETIC RESOURCES OF CHINA
    Xue Dayuan
    1997, 12 (1):  55-59.  doi: 10.11849/zrzyxb.1997.01.009
    Abstract ( )   PDF (147KB) ( )   Save
    The oblainment of genetic resources is a core issue of the Biological Diversity Convention and an argument focus in the negotiations of the Convention between the developing countries and the developed countries. In this paper, according to Article 15 of the Convention and the present situation of the protection of genetic resources in China, some strategic measures are suggested for conserving and rationally using the resources. The measures include establishing legislations, policies and patent systems to deal with the problem of obtaining genetic resources; promoting further the collection, protection and scientific researches of domestic genetic resources; and obtaining as many as possible the genetic resources from international agricultural research institutions and other foreign countries through resource exchanges,study co operation projects and other approaches.
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    RECENT SITUATION AND PROSPECTS OF THE STADY OF EUCOMMIA ULMOIDES
    Yang Junshan, Zhang Yumei, Jiang Shenghu
    1997, 12 (1):  60-67.  doi: 10.11849/zrzyxb.1997.01.010
    Abstract ( )   PDF (418KB) ( )   Save
    This paper generally describes the present study state of Eucommia ulmoides in the aspects of resources, cultivation, chemical constituents, medicinal activity and clinical application. Furthermore, the prospects of its exploitation and utilization are forecastad.
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    A RESEARCH ON THE RESOURCE OF THE FRUIT TREESOF RIBES IN THE NORTHEAST AND INNER MONGOLIA AREA, CHINA
    Zhang Bingbing, Liu Huitao, Dong Yingshan, Song Hongwei, Lin Fengqi
    1997, 12 (1):  68-71.  doi: 10.11849/zrzyxb.1997.01.011
    Abstract ( )   PDF (167KB) ( )   Save
    The paper makes an investigation of the resource of the fruit trees of Ribes in the Northeast and Inner Mongolia area. We preliminarily as certain that there are 19 species, 2 varieties and 1 forma. We also make researches on their features, characteristics, ecological environment, distribution and utilization value. Finally, we summarize the research achievements of domestication cultivation and put forward some suggestions about their exploitation and utilization.
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    THE DYNAMIC SIMULATION MODEL OF SOILMOISTURE OF THE NORTH CHINA PLAIN
    Lin Yaoming
    1997, 12 (1):  72-77.  doi: 10.11849/zrzyxb.1997.01.012
    Abstract ( )   PDF (188KB) ( )   Save
    According to the measured soil moisture,the agricultural meteologic data and the satellite monitoring data of the wheat season of the North China Plain in the years1993—1995,a regional soil moisture model is tested to simulate the process of the dynamic change of soil moisture and its related elements and to overcome the defect that former remote sensing model of soil moisture can only determine the soil moisture content but not the structure of water amount. This test has gained satisfactory effects. It successfully uses the remote sensing data as the input of the model and reaches the goals of monitoring the soil moisture conditions,analysing the hydrology and water conservancy and estimating the crop production based on remote sensing. At the time of exporting the structure of water amount,the model can also provide the information about the impacts of human activity on the water environment.
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    BUILDING THE KNOWLEDGE BASE FOR THE AGRO ECOLOGICAL PATTERN OF MULTIPLE CROPPING IN THE LOWER LIAOHE PLAIN
    Liang Wenju, Wen Dazhong, M. C. Saunders, B. J. Miller, Liu Dan
    1997, 12 (1):  78-83.  doi: 10.11849/zrzyxb.1997.01.013
    Abstract ( )   PDF (196KB) ( )   Save
    In this paper, on the basis of the situation of the Lower Liaohe Plain, the knowledge base for the agroecological pattern of multiple cropping is built by using the expert system development tool. The procedures for building the knowledge base of expert system are put forward. They include knowledge acquisition, knowledge expression, making codes, and verification. The building of the knowledge base can transfer the expertise and the domain experts' experiences on multiple cropping to the agricultural policy makers in an acceptable fashion, thus improving the automation and scientism of agricultural policy making.
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    A STUDY ON THE ANALYSIS DETERMINATION METHOD OFTHE RATIONAL ANNUAL CUT OF FORESTS
    Li Chungan
    1997, 12 (1):  84-88.  doi: 10.11849/zrzyxb.1997.01.014
    Abstract ( )   PDF (155KB) ( )   Save
    The analysis determination of the rational annual cut of forests is one the critical techniques used to work out the quota of the annual forest cut. It is also one of the important contents of forest management. In this paper, according to sustained utilization theory of forests, a synthetic evaluation model of the analysis determination is established and a precise method of the analysis determination of the rational annual cut of forests suggested, thus effectively assuring the results to be scientific and accurate.
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    CALCULATION OF THE PRODUCTION RATE OF METHANE IN RUBBISH AND ESTIMATE OF THE RUBBISH METHANE RESOURCE OF CHINA
    Xu Xinhua
    1997, 12 (1):  89-93.  doi: 10.11849/zrzyxb.1997.01.015
    Abstract ( )   PDF (404KB) ( )   Save
    In this study,we analyze several calculation methods of the production rate of methane in rubbish and make a detailed calculation of the production rate and the cumulate output of methane. On the basis of this study,we use a real rubbish dumping field to calculate the production rate and the cumulate output of methane. It helps to supply the useful reference deta for producing electricity from rubbish in the rubbish dumping fields. Finally we calculate the methane output from rubbish of every province and the potential methane resource in rubbish of the whole country.
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    THE CHARACTERISTICS OF MINERAL RESOURCESIN SHANDONG PROVINCE AND ITSDEVELOPMENT AND UTILIZATION
    Dai Hezhi
    1997, 12 (1):  94-96.  doi: 10.11849/zrzyxb.1997.01.016
    Abstract ( )   PDF (103KB) ( )   Save
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