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Four different kinds of water treatment were applied to examine the photosynthetic characteristics of baldcypress (Taxodium distichum) seedlings in the hydro-fluctuation belt of the Three Gorges Reservoir area.
      
distichum takes on the features of a water-tolerant and hydrophilic plant, which can be considered as one of the species for the building of a forest protection system for the hydro-fluctuation belt in the Three Gorges Reservoir area.
      
Effects of reforestation on the hydrological function of a small watershed in the Three Gorges Reservoir Area
      
Four different kinds of water treatments were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings in the environment of the Three Gorges hydro-fluctuation belt.
      
To establish a protection forest system in the hydro-fluctuation belt in the Three Gorges Reservoir Area, the species T.
      
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The main works of diverting south-water to north which the paper mentioned, from three gorges reservoir of Yangtze River, Cross Yangtze River, Huai River, Yellow River and their drainage area, is 1600 km long. That's great project which make great change to take place in our country.The programme of the project begin in 1950's, and its feasibility has been scientifically expounded and proved. In 1984, infrared colour aerial photography on the scale l/20000 had been finished along the main works from...

The main works of diverting south-water to north which the paper mentioned, from three gorges reservoir of Yangtze River, Cross Yangtze River, Huai River, Yellow River and their drainage area, is 1600 km long. That's great project which make great change to take place in our country.The programme of the project begin in 1950's, and its feasibility has been scientifically expounded and proved. In 1984, infrared colour aerial photography on the scale l/20000 had been finished along the main works from Yellow River to Beijing section by center of Remote Sense, Ministry of Geology and Mineral Resources in order to discuss the feasibility of the project and prepare to earlier work. In this time, we choise a section which is 407km long and 18916km2 in Hebei to have success- fully done the analysis of remote sensing on hydrological engineering geology.

拟议中的南水北调中线工程,南起长江三峡水库,横跨长江、淮河、黄河及海河流域,全长 1600km,是一项跨流域远距离调水,改变祖国面貌的宏伟工程。自50年代起,该项工程就开始了 规划,并对其可行性进行了多方面科学论证和研究。1984年地矿部地质遥感中心沿黄河至北京段 进行了1:2万彩红外航空摄影,为河北段进行遥感解译试点工作提供了先决条件。本次工作选择 河北段长470km,面积18,916km2进行遥感水文工程地质解译,取得了成功。

Baoji-Tianshui railway was built before sept. 1949. lot of diseases and hidden dangers were left at that time. After that time a large-scale of controls were carried out. The state investiment has broken through two millions per kilometer. It is full enough to construct another Baoji-Tian-shui railway. Direct loss and influnce caused by landslides are even more immeasurable.The policy that is taken in tackling these geological hazards by railway department is to rely mainly on putting prevention first while...

Baoji-Tianshui railway was built before sept. 1949. lot of diseases and hidden dangers were left at that time. After that time a large-scale of controls were carried out. The state investiment has broken through two millions per kilometer. It is full enough to construct another Baoji-Tian-shui railway. Direct loss and influnce caused by landslides are even more immeasurable.The policy that is taken in tackling these geological hazards by railway department is to rely mainly on putting prevention first while making treatment subsidiary, and to combine treatment with prevetion. However, for prevention we should have a pretty clear idea of how things stand. And it is necessary for treatment in order of importance and urgency. Just for this goal we carried out landslide investigation and research on Baoji-Tianshui railway.The investigation and research are divided into two stages: general survey of landslide distribution and dynamic analysis and comparison of landslides. The former was completed through interpretation of panchromatic black and white aerial photographs, imaged on August 20th, 1985, on the scale of 1:10000. To accomplish the latter were used panchromatic black and white, infrared color airphotos of difference time phases and on several scales. For inspecting physiographic environment and geological background were analysed MSS images of Landsat also.In process of general survey of landslides for inspecting natural distribution laws of landslides, our remote sensing image analysis v/as carried out over a more wide range that involves two sides of each kilometer of railway. In interpretation of airphotos 398 landslides and 206 collapses were found out. Landslides directly related to the railroad is 61 while collapses-94. The former is concentrated on the sections Hudian-Fenggeling and Jianhe-Boyang. The latter is concentrated on section Yanjiahe-fenggeling. They are concentrated in the middle part. They reach the peak from Pingtou, and then stretch right to the west of Boyang.Generally speaking, such conditions reflect the following factors: topography, geology, hydrology and human activity. Looking from the topography, the middle part of Baoji-Tianshui railway winds through the gorge of Weihe river. Qinling mountain and Lupan Mountain hold it under duress from left and right. The railway was situated at the foot of the Mountain and beside the river. The high filling and deep cutting were compelled to take. Undoubtedly, this is closely related with the design idea and engineering measures at that time. Therefore it also reflected the influnces of man-made factors. Intense lateral erosion of Weihe river is the main hy-drologic factor while the influence of ground water is also important. As for geologic factors, here they mean frequent magmatic intrusion, violent tectonic movement, crushing and weathering of meta morphic rocks as well as peculier nature of loess. The generation of landslides and collapses is closely associated with lithology. According to the preliminary statistics the landslides generated in loess are the most. They are totalled up to 271 and make up 71.7 percent of the sum total. The landslides generated in crushed metamo-rphic complex and weathered granite series are the second. The two are respectively 51 and 54, that make up 13.5 and 14.3 percent of the sum total. The landslides generated in sandstone-conglomerate series only make up 0.5 percent of the sum total.Collapses generated in granite series are the most. They are totalled up to 102 and make up 49.5 percent of the sum total. The collapses generated in metamorphic complex are second. The total of them is 74 and make up 35.9 percent of the sum total. Collapses generated in loess are far less, only 28 and make up 13.6 percent of the sum total. As for collapses generated in sandstone-conglomerate series, they are seldom seen. They amount only to 2 and make up 1.0 percent of the sum total.Looking from the general lithological distribution of landslides and collapses, the advantage is also laid with loess-61.2 percent. The granite series a

本文介绍了利用遥感技术对宝天铁路滑坡和崩塌灾害的调查与动态分析。通过对5个时相不同比例尺的航空像片的分析判读,在宝天段线路两侧各1公里的地带内共发现滑坡398处、崩塌206处,其中涉及线路的滑坡61处、崩塌94处。其次,在综合分析地形、地质、水文和人文等病害因素的基础上,探讨了该区域工程病害的发生规律。分析结果表明,滑坡以发生在黄土者最多,其次为破碎的变质岩和风化的花岗岩,而砂砾岩中最少;崩塌以发生在花岗岩者居多,其次是变质岩系,再次为黄土,砂砾岩中最少。该成果不仅发现了比既有资料多得多的滑坡数量,而且初步摸到了滑坡的发生规律,从而为该段线路病害的防治提供了可靠的依据。

This paper introduces the geological-geophysical characteristics of landslides.It is shown that the distribution of geophysical properties in landslides and the geophysical anomalies due to them are distinct from those in stable slopes,thus providing a good geological-geophysical prerequisite for studying landslides with geophysical methods.The paper also introduces the application of geophysical methods to the study of landslides.It is shown that geophysical methods can be successfully used to study the condition...

This paper introduces the geological-geophysical characteristics of landslides.It is shown that the distribution of geophysical properties in landslides and the geophysical anomalies due to them are distinct from those in stable slopes,thus providing a good geological-geophysical prerequisite for studying landslides with geophysical methods.The paper also introduces the application of geophysical methods to the study of landslides.It is shown that geophysical methods can be successfully used to study the condition of engineering geology of landslides and to forecast landslides.Finally,the paper discusses the necessity and possibility of application of geophysical methods to the study of landslides in the reservior area of the Three Gorges. Because the amount of landslides in the area is large,the task of studying landslides is pressing and most of landslides in the area are suitable of being detected by geophysical methods, the application of geophysical methods to detection of landslides is not only necessary but also possible.The prospects for the application of geophysical methods to the detection of landslides in the reservior area of the Three Gorges are brilliant.

介绍了滑坡的地质-地球物理特征,指出了滑坡中的物性参数分布和滑坡产生的地球物理异常都和稳定边坡有明显的不同,为用物探方法研究滑坡提供了良好的地质-地球物理前提;对物探方法在研究滑坡时的应用进行了介绍,用实例说明了物探方法可以成功地用来研究滑坡地段的工程地质条件和预测滑坡过程;对三峡库区应用物探方法研究滑坡的必要性和可能性进行了探讨。

 
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