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    Change of arable land area in China during the past 20 years and its policy implications
    LI Xiu bin
    JOURNAL OF NATURAL RESOURCES    1999, 14 (4): 329-333.   DOI: 10.11849/zrzyxb.1999.04.007
    Abstract357)      PDF (183KB)(139)      
    Dynamics of arable land and its driving forces in China during the past 20 years are discussed in this paper based on statistical and survey data at national,provincial and county levels.It was found that (a)the general trend of net arable land loss started in the late 1950s which got continued and accelerated in the study period;(b)peaks of arable land loss were usually correspondent to the booming up periods of the economy;(c)the lost arable land was mostly those high quality land in the eastern part while the acclaimed land was mostly marginal land in the western part of the country;(d)area of arable land occupied by non agricultural sectors was sensitive to investment in fixed assets,indicating a low efficiency of land utilization in non agricultural sectors;and (e)urbanization rate had a positive influence on the efficiency of land utilization.The author claims that the following points should be emphasized in land management in order to protect the valuable arable land resources in the country:(a)importance should be placed on both the quantity and quality of arable land.In this connection,the present policy of “keeping quantity balance" within an administration territory is no good to the very land required protection,namely,the high quality arable land;(b)policies on rural urban migration and the development of rural industry should be reviewed,since land utilization of the non agricultural sectors in rural areas is far more inefficient than those in urban areas; and (c)land market construction in both urban and rural areas should be strengthened,since the poor circulation of land resources is a major factor of the low land utilization efficiency in China.
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    Cited: Baidu(352) CSCD(231)
    THE CLIMATE SUITABILITY OF TOURISM AT THE COASTLINE DESTINATIONS OF CHINA
    FAN Yezheng, GUO Laixi
    JOURNAL OF NATURAL RESOURCES    1998, 13 (4): 306-311.   DOI: 10.11849/zrzyxb.1998.04.003
    Abstract135)      PDF (403KB)(73)      
    Chinas 18000 kilometer long coastline has great potential for the deve lopment of seashore tourism. The unique natural conditions, particutarly the mild climate, have attracted numerous tourists to come for the leisure or convalescent tourism on seashore. The research focuses on the physiological climate of coastal cities and small offshore islands in China.Four indexes—temperature, humidity, wind velocity and sunshine hours were selected in this research. Each of the indexes has its own effect on a body of person, so two integrated indexes were employed in the research. One is temperature humidity index, it shows true temperature sense of body; and the other one is index of wind effect, it shows true wind sense of body. These two indexes are calculated from temperature, humidity, wind velocity, and sunshine hours. The data from 37 observatory(25 coastal cities and 12 small offshore islands)were analyzed in this research. The influence of tropical cyclone and cold airflow was also considered. In this research, it is found that there are about 4~6 months convalescent climate for tourism in Bohai Gulf and southern Hainan coastal cities, in addition, there is great seasonal complementarity between the two areas. It is also found that the climate is not very good for tourism in the other coastal cities of China.
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    Cited: Baidu(121) CSCD(76)
    Research on solutions to domestic solid waste in cities of China
    WANG Weiping
    JOURNAL OF NATURAL RESOURCES    2000, 15 (2): 128-132.   DOI: 10.11849/zrzyxb.2000.02.007
    Abstract102)      PDF (202KB)(107)      
    Municipal Domestic Solid Waste problem is a global concern.It puts great challenges to cities all over the world.China's cities are facing the same problem.Both the central and local government attaches great importance to it.Waste problem is attracting great social awareness as well.Solutions to and management structure of the current solid waste problems are not compatible with the situation and must be adjusted.Referring to overseas experience,this thesis proposes adjustment scheme for solution to domestic solid wastes in China's cities.
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    Cited: Baidu(23) CSCD(4)
    RESEARCH ON THE METHODS OF QUANTITATIVE ESTIMATE OF THE GRASS OUTPUT OF A VAST GRASSLAND BY USING THE REMOTE SENSING DATA OF NOAA/AVHRR
    Li Jing, Chen Jin, Yuan Qing
    JOURNAL OF NATURAL RESOURCES    1994, 9 (4): 365-368.   DOI: 10.11849/zrzyxb.1994.04.009
    Abstract124)      PDF (416KB)(233)      
    In this paper, the Advanced Very High Resolution Radiometer (AVHRR) data from the NOAA Meteorological Saterllite are used to estimate the grass output of a vast grassland. Xilingele League of Inner Mongolia is selected as a test area, which is a typical grassland in North China. From the aspects of estimate principles, vegetation index selection and landscape ecological regionalization, the feasibility and approaches of using the NOAA/ AVHRR data to estimate and monitor the grass output of a vast grassland are discussed. Some new methods, including atmospheric correction, geometric correction and so on, are tried in data preprocess. The GIS technology also is applied in the research. It can be concluded that suitable landscape ecological regionalization and essencial data preprocess are the basis of improving the accuracy of output estimate.
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    Cited: Baidu(18) CSCD(13)
    STUDY ON OPTIMIZATION STRUCTURE MODEL OF FARMING AND ANIMAL HUSBANDRY IN AGRICULTURAL ECOSYSTEM
    YANG Xiu, LI Wenhua
    JOURNAL OF NATURAL RESOURCES    1998, 13 (4): 344-351.   DOI: 10.11849/zrzyxb.1998.04.009
    Abstract265)      PDF (330KB)(77)      
    According to the principle of harmonious development of integrated farming system, based on material and energy flow and economic value flow in the existing agriculture system in consideration of restrained factors of land area, manpower, livestock power, social demand and fodder amount in the investigation area, an optimization structure was suggested. In the light of the optimization model, the total net profit of farming and animal husbandry can be 69 14% more than that of conventional one, and the system's comprehensive profit index can be increased by 33.48%, which indicated that this optimization design can provide significant benefits for adjusting the structure of agriculture system in the investigation area.
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    Cited: Baidu(17) CSCD(11)
    A QUANTITATIVE STUDY ON THE EFFECTS OF CONTROLLEDBURNING ON THE NUTRIENT LOSS OF THE YOUNG CHINESE FIR PLANTATION
    Xie Yinghe, Hong Jianping, Jin Zhinan, Lin Dayi, Zhao Jingkui
    JOURNAL OF NATURAL RESOURCES    1997, 12 (3): 243-249.   DOI: 10.11849/zrzyxb.1997.03.007
    Abstract82)      PDF (218KB)(66)      
    On the basis of the results of a long term fixed location observation of 5 years, this paper uses the two model parameter t test, the elasticity analysis and the marginal analysis for exploring the effects of the annual time series on the nutrient losses of controlled burning and the the constractive young Chinese fir plantation.The t test shows that the B and A parameters of the loss models of amoniacal nitrogen, nitrous nitrogen, nitrate nitrogen,phosphate, potassium and arganic matter on the annual time series are quite different under different treatments. The elasticity analysis and marginal analysis show that the effects of annual time on the above mentioned nutrients under different treatments are negative. Under the controlled burning conditions, the elasticity coefficients of the above mentioned nutrient losses are-1.215%, -1.214%, -1.215%, -1.215%,-1.214% and-1.214%respectively,and their marginal amounts are-0.394 kg,-0.033 kg-0.365 kg, -0.023kg, -30.010 kg and -59.421 kg respectively. Under the treatments without controlled burning, the elasticity coefficients of the above mentioned nutrient losses are -0.842%,-0.851%, -0.844%, -0.854%, -0.845% and -0.841% respectively, and their marginal amounts are -0.159 kg, -0.010 kg, -0.085 kg, -0.006 kg, -12.024 kg and -17.767 kg respectively.
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    Cited: Baidu(10) CSCD(7)
    RESEARCH ON CAUSES FOR ENDANGERMENT OF RHODODEND RON PROTISTUM VAR. GIGANTEUM AND R. CYANOCARPUM
    ZHANG Changqin, FENG Baojun, LU Yuanlin, ZHOU Bing, GAO Lianming
    JOURNAL OF NATURAL RESOURCES    1998, 13 (3): 276-278.   DOI: 10.11849/zrzyxb.1998.03.014
    Abstract145)      PDF (191KB)(87)      
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    Cited: Baidu(8)
    Study on the resourceful property of coal fly ash and the applied technology to pavement engineering
    LIU Shengyong,ZHANG Quanguo,YANG Qunfa,ZHANG Xiangfeng
    JOURNAL OF NATURAL RESOURCES    2000, 15 (2): 180-183.   DOI: 10.11849/zrzyxb.2000.02.017
    Abstract201)      PDF (144KB)(72)      
    Based on the study of technological parameters of coal fly ash in laboratories,the influencing regularity of different ingredients and forms of coal fly ash on its resourceful property was disclosed.The optimum experiment for geting rid of carbon harmfulness to resourceful property of coal fly ash was initially finished.The coopera ting rate of decarbonized coal fly ash concrete was researched and used to fulfil the pavement repair work.The result shows that decarbonized coal fly ash can obviously improve the working property of the concrete.Both practical road conveyance and technological function can satisfy the demands of pavement engineering.Both the economic and environmental benefit is enormous.
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    Cited: Baidu(6) CSCD(1)
    THE WILD ORNAMENTAL XYLOPHYTA RESOURCE IN THE SHERGYLA MOUNTAIN REGION IN TIBET AND ITS EXPLOITATION AND UTILIZATION
    Zheng Weilie
    JOURNAL OF NATURAL RESOURCES    1996, 11 (1): 89-98.   DOI: 10.11849/zrzyxb.1996.01.012
    Abstract135)      PDF (612KB)(120)      
    The wild ornamental xylophyta resource in the Shergyla Mountain region is abundant. There are 40 families, 75 genuses and more than 190 spieces. The main families are Rose Family, Heath Family, Honeysuckle Family, Saxifrage Family and Pea Family. The main genuses are Rhododendron, Honeysuckle, Plum, Spiraea and Contoneaster. Of them 47.6% are Flower trees, 24.6% are Flower-fruit trees, and 11.0% are Fruit trees. Of the Flower trees, 46.4% are white flower spices, 19.6% yellow, 18. 1 % red and pink, type makes up 75.3%, the Sun-shrubs type 16.8% and the Alpine-shrubs type 7.9%. The spieces of the Sun-shrubs type are introduced and used most easily. Yellow Peony, Hookers St. John'swort, Rockspray Cotoneaster, Largeflower Jasmine, Big Cupress and so on must be exploited first, as they are introduced easily and their ornamental value is very high.
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    Cited: Baidu(5) CSCD(3)
    DEVELOPMENT AND UTILIZATION OF THE MACRO-FUNGUS RESOURCE IN THE SHENNONGJIA FOREST DISTRICT
    Chen Qiwu, Zhu Lanbao, Yang Xinmei
    JOURNAL OF NATURAL RESOURCES    1996, 11 (3): 268-271.   DOI: 10.11849/zrzyxb.1996.03.012
    Abstract111)      PDF (238KB)(77)      
    There is very rich macro-fungus resource in the Shennongria Forest District. There are 252 species, belonging to 86 genera, 24 families, 8 orders and 2 classes. Of the many species 114 are edible, 10 are medicinal, 19 are poisonous and about 109 whose usage is yet unknown. These fungi account for 38.36% of the total 657 species collected in the whole country. This paper deals with their natural genesis kinds and distribution, and puts forth some suggestions about their development and utilization.
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    Cited: Baidu(4) CSCD(2)
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