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  • 1985 Volume 40 Issue 4
    Published: 15 October 1985
      
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  • THE CHARACTERISTICS AND THE QUANTITY OF SEDIMENT YIELD ON THE HUANGLING AMTICLINAL REGION IN THE YANGTZE GORGES
    Lin Chengkun
    1985, 40(4): 293-306. https://doi.org/10.11821/xb198504001
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    The Huangling Anticlinal Region lies in east Three Gorges of the Yangtze River. According to different physiographic factors, the auther divides the Huangling Anticline into five sediment yield zones : I. zone of complex, II. zone of plagioclastic granite, III. zone of quartz diorite, IV. zone of limestone, V. zone of sandstone and limestone.In this paper, the author based on the data observed on the modulus of sediment yield at nine typical small watersheds (0.8- 553.5 km2) in the Huangline Anticline Region, analyzed the different physiographic factors such as thickness of weathering crust.
  • A STUDY ON SELENIUM IN ECO-ENVIRONMENT OF SHAANXI SHENG
    Chen Daizhong, Li Jiyun, Ren Skangxue
    1985, 40(4): 307-322. https://doi.org/10.11821/xb198504002
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    Selenium is one of the essential element to life which have close relations with human health. In order to expound the relation of Se in eco-environment with human body health, the distributional and differentia] rule of Se for each essential factors of eeo-environment in Shaanxi, the pathway and flux for trasmision of Se from environment to human body, the metabolism level of Se in our human body, and its effect on human body health has been studied systematically. It is showed that there are integrated eeo-environment series from deficiency-optimal-toxicity of Se in Shaanxi.The quaternary loess and granite with low-Se content are predominnted in rock and parent materials of the soil in Shaanxi, thus most of soil in whole province belong to the soil deficient in Se.
  • THE DISTRIBUTION OF PRECIPITATION IN MOUNTAIN QILION(NANSHAN)
    Tang Maocang
    1985, 40(4): 323-332. https://doi.org/10.11821/xb198504003
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    Based on the climatic data longer than 20 years, the characteristics of precipitation, including its distribution, variation with altitude and monthly changes are analysed. It may be argued that the variation of anmal precipitation with altitude may be described as a triple curve (one maximum and one minimum appeared in different height). However, in the winter time, it may be described exactly by a quadratic curve (only one maximum height appeared). The "Plateau monsoon has a evident effect on the precipitation distribution of different slopes. Comparing with the surrounding area, the precipitation in the Qinghai lake is reduced in Feb-Jwne and increased by July-Jan, which may be contributed to the thermal effects of this lake.
  • THE PRINCIPLE AND METHOD FOR MEASUREMENT OF GRASS OUTPUT OF INNER-MONGOLIAN GRASS LAND USING NOAA-CCT
    Xiru Xu, Lifang Jin, Lin Changgong, Zhou Sisong, Zhang Meng
    1985, 40(4): 333-346. https://doi.org/10.11821/xb198504004
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    It is very important to know grass output of this year for mordernizing manege-nient of grass land. Satellite data is an ideal tool for solving this problem. Because the circle period of Landsat covering is about 14-18 days, it’s difficult to get the whole Nei Monggol Zizhiqu grass land Landsat Image cover with the proper time phase, but the NOAA series satellite have much more chance to offer scan of earth surface, four times per day, and the instruments AVHB-K aboard on NOAA has two similar spectrum bands with Landsat MSS(AVHER channel I is similar to MSS5 AVHER channel 2 is similar to MSS7). So it is reasonable 1o try using NO AA-CCT to know grass output of Nei Monggol Zizhiqu grass land.Bassed on linear mixture pixel theory and one layer flat plane model of grass field we pointed out the greenness G, namely The ratio of spectrum reflectance of AVHRR channel 2 to channel I G = ρ2/ρ1, has the best sensitivity. We gave out the linear statistics relationship shown on figure 2 between the greenness and grass output (wet weight) through fields experiments in Nei Monggol Zizhiqu Xilin Gol Meng.
  • ORIGIN AND FORMATION OF SPHERICAL QUARTZ SANDS IN JIDONG PLAIN
    Gao Shanming
    1985, 40(4): 347-355. https://doi.org/10.11821/xb198504005
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    Fiue spherical quartz sands with high roundness are widely extended in Jidong Plain. They are carried away to many places compound with sediments from the Luan-he River, but mainly concentrated on the second terrace of Luanhe River in the Yan-shan Mountainous region and the alluvial fan plain of the Late Pleistocene. The largest buried depth is about 180 m.The upper Luanhe River is called as a Shandianhe River. A larger Whenshandak desert on the Xei Mongolia Plateau to north of the river is an origin of spherical sands and quartz grains with surface covered by eoliau dish-shaped pits.The sands in desert are leapt to south by wind force and are transported by Luan-he river and dropped into water. Owing to trasportation in a long distance, abrasion and depositing, the surface of quartz sand has impacted by dense V-shaped pits in a collision.
  • A PRELIMINARY DISCUSSION ON THE NATURAL SUPERIORITY OF HAINAN DAO AND ITS ORIENTATION FOR DEVELOPING COMPREHENSIVE AGRICULTURE
    Liu Donglai
    1985, 40(4): 356-366. https://doi.org/10.11821/xb198504006
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    The author suggests the following two key priciples ought to be followed in our human economic activities: 1) to keep the equilibrium relationships among the four variables──natural resources, the environment, population, and development, and to establish a global carrying-capacity of renewable resources for humanbeings. 2) to develop the superiority, i.e. to develop the favourable conditions of each specific area in its natural, economic and technical aspects as a whole. To meet the requirements for the development of national economy, it is preferable to develop in areas most favourable in conditions the most suitable agricultural sectors and crops so as to put the minimum cost and to achieve maximum economic benefits.In accordance with the principles mentioned above, the paper discusses the changes occurred in Hainan Dao in its of agricultural development over the past 30 years, particularly the changes of equilibrium among the four variables------natural resources, environment, population, and development, and that of global carrying-capacity of renewable resources for humanbeings, the unfavourable natural conditions, fragility and superiority of the area. Based on its superiority, the author proposes the orientation for developing comprehensive agriculture of island, and for its vealization correspondent policy and a aeries of measures needed to be adopted.
  • TWENTY FIVE YEARS OF GLACIOLOGY IN CHINA: RETROSPECT AND PROSPECT
    Shi Yafeng, Xie Zichu, Zhang Xiangsong, Huang Maohuan
    1985, 40(4): 367-376. https://doi.org/10.11821/xb198504007
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    Glaciology in China has gone through several stages of saddle development in the past twenty five years. A research team of Chinese workers in glaciology has been established with its centre at Lanzhou Institute of Glaciology and Cryopedology. It filled in the gaps of research on contemporary glaciers in China and accumulated abundant glaciologioal data from field observation and experiment. We have solved a lot of important engineering problems concerning economic construction. Basic researches of regional glaciology and measurement techniques of glaciology have also been carried out. The field of our research has been extended from mountain glaciers to Antarctic Ice Sheet, including glacial geomorphology, geology, glacical hydrology, meteorology, physics of snow and ice et al.. The main area of research are the glaciers on the Qinghai-Xizang Plateau and its adjacent high mountains, and extend to the study of other natural snow and ice. We do not only attach importance to the basic theorectical research but also the applied aspect. A system of glaciology with Chinese characterization has begun to take shape.The particular conditions China determine the trends and tasks of the development of glaciology in China. They are: concentrating our efforts to solve in fulfilling the key items for economic construction, particularly those concerning agriculture, communications and environment, focus on the Qinghai-Xizang Plateau and at the once time paid attention to the trends of international glaciology, Training of younger workers in glaciology, and raise the level of mathematics and physics; accelerate the construction of Tianshan Glaciological Station and Low temperature laboratory; adopt more new techniques; research on the Antarctic Ice Sheet, to take an active part in the international glaciological expedition and international academic exchange. According to the principles of "developing good points and discard shortcoming, bring into play superiority, making the key points stand out, and giveing consideration to general", we hope that shall be able a attain a higher and level in glaciological research and become one of the research centres of international glaciology in the near future.