2004 Vol. 10, No. 4

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FEATURES OF SPACE DISTRIBUTION OF THE FOREST LINE AND RELATIONS BETWEEN THE FOREST LINE AND CLIMATIC LIMIT OF PERMAFROST AND CLIMATIC SNOWLINE IN CHINA
JIANG Fu-chu, WU Xi-hao, WANG Shu-bin, FU Jian-li, WANG Yan, ZHAO Zhi-zhong
2004, 10(4): 289-299.
Abstract (340) PDF (495KB)(28)
Abstract:
The altitude of the forest line that is generally marked by the upper limit of the dark coniferous forest zone in the vertical zones of natural vegetation is controlled by the temperatures and their annual range.In this paper, based mainly on the heights above sea level of the upper limits of the mo...
LAKE-LEVEL CHANGE OF NAM CO,TIBET,SINCE THE LATE PLEISTOCENE AND ENVIRONMENT INFORMATION OF CLAY MINERALS IN LACUSTRINE DEPOSITS
ZHU Da-gang, MENG Xian-gang, ZHAO Xi-tao, SHAO Zhao-gang, MA Zhi-bang, YANG Chao-bin, WANG Jian-ping, WU Zhong-hai
2004, 10(4): 300-309.
Abstract (236) PDF (335KB)(8)
Abstract:
Field surveys of lacustrine sediments and lakeshore levees and leveling surveys of lake terraces at peripheries of Nam Co-the largest lake with the highest altitude above sea level in Tibet-indicate that there are 6 lake terraces below the lakeshore of Nam Co 48 m above the lake level and highstand ...
QUATERNARY SPOROPOLLEN ASSEMBLAGES AND ENVIRONMENTAL EVOLUTION OF THE GONGHE BASIN ON THE NORTHEASTERN MARGIN OF THE QINGHAI-TIBET PLATEAU
SHI Wei, MA Yin-sheng, WU Man-lu, DU Jian-jun, ZHANG Xi-juan
2004, 10(4): 310-318.
Abstract (176) PDF (506KB)(9)
Abstract:
Relatively thick Quaternary strata are deposited in the Gonghe basin on the northeastern margin of the Qinghai-Tibet Plateau.They record Quaternary environmental changes in the basin in details.On the basis of an analysis of the characteristics of Quaternary depositional sequences and sporopollen as...
PALEOGENE AND NEOGENE PALEOCLIMATIC CHANGES IN THE TURPAN BASIN,NORTHWEST CHINA
ZHANG Xi-juan, CHENG Jie, WANG Hai-zhi, YU Wen-yang
2004, 10(4): 319-326.
Abstract (290) PDF (246KB)(9)
Abstract:
The Paleogene and Neogene at the Lamjin section in the Turpan basin, Xinjiang, have a sedimentary thickness of~1779 m.This section is a good carrier for the study of the paleoclimate in this period in the basin.Major element geochemical analysis of the sediments in the section indicates the followin...
DISCOVERY OF QUATERNARY REMNANTS OF GLACIATION IN THE NORTHERN SEGMENT OF THE LULIANG MOUNTAINS,NINGWU,SHANXI,AND THEIR SIGNIFICANCE
MENG Xian-gang, ZHU Da-gang, SHAO Zhao-gang, YU Jia, HAN Jian-en, MENG Qing-wei
2004, 10(4): 327-336.
Abstract (262) PDF (618KB)(19)
Abstract:
Lying at an average elevation of~2000 m above sea level and a relative elevation of a few hundred to about one thousand meters, the northern segment of the Lüliang Mountains, Ningwu, Shanxi, belongs to a medium mountain area.In the area Quaternary remnants of glaciation are very well developed and t...
VARIATION OF PRECIPITATION IN NAM CO,TIBET,SINCE THE LATE PLEISTOCENE AND ITSENVIRONMENTAL RESPONSE
SHAO Zhao-gang, MENG Xian-gang, ZHU Da-gang, WANG Jin, YANG Chao-bin, HAN Jia-nen, YU Jia, MENG Qing-wei
2004, 10(4): 337-343.
Abstract (218) PDF (225KB)(6)
Abstract:
Field surveys of the Nam Co-a large lake with the biggest area (1940 km2) and highest elevation above sea level (4718 m) in Tibet show that there are extensive lacustrine sediment around the Nam Co.Uranium-series and 14C dating indicate that the lacustrine sediments along the shores of the Nam Co ar...
INVESTIGATION OF THE EVOLUTION AND ENVIRONMENT CHANGE OF TYPICAL LAKES IN YUNNAN
SHI Zheng-tao, MING Qing-zhong, ZHANG Hu-cai
2004, 10(4): 344-350,365.
Abstract (276) PDF (1636KB)(13)
Abstract:
This paper introduces the primary results of investigations of seven lake systems and geomorphology of the lake areas in Yunnan.A total of 140 m of drilling cores were recovered from the wells in the seven lakes and bed mud samples were taken from some of the lakes.Investigation and study of the lak...
REMOTE SENSING CLASSIFICATION OF SURFACE FEATURES ON THE ROIG(E) PLATEAU
XU Gang, ZHAO Zhi-zong
2004, 10(4): 351-356.
Abstract (190) PDF (212KB)(9)
Abstract:
All materials have their characteristic spectral absorption peaks in remote sensing data.So missing and mixing of information that usually occurred in previous remote sensing classification may be greatly reduced by spectral identification.In order to solve the problem of the remote sensing classifi...
NUMERICAL SIMULATION OF THE STABILITY OF HIGH SAND LOESS SLOPES
ZHANG Yong-shuang, WANG Hong-cai
2004, 10(4): 357-365.
Abstract (206) PDF (302KB)(10)
Abstract:
Based on field investigation and lab tests, the main failure form of the sand loess slope and its impact factors on the northern Loess Plateau are summarized in this paper.Taking for an example from the construction of high-type highways in northern Shaanxi, a series of numerical simulations have be...
COMPARATIVE ANALYSIS OF THE METHODS OF INTERNAL FORCE CALCULATION OF THE PRESTRESSED CABLE LATTICE BEAM FOR LANDSLIDE CONTROL
MA Ying-juan, PENG She-qin, ZHOU Bin
2004, 10(4): 366-371.
Abstract (202) PDF (222KB)(8)
Abstract:
On the basis of the case study of a landslide prevention and control engineering work, a new model for design and calculation of the lattice beam suited to the layout of the engineering work is proposed.According to a comparative analysis of the results of calculation by using this model and the res...
TECTONIC CHARACTERISTICS IN THE PINGXIANG AREA IN THE JUNCTION BELT BETWEEN THE YANGTZE PLATE AND SOUTH CHINA PLATE
LIU Xi-yuan, ZHONG Da-hong, YUAN Jian-ya, XIE Qing-hui, LI Yi-chun
2004, 10(4): 372-379.
Abstract (225) PDF (277KB)(14)
Abstract:
The junction belt between the Yangtze plate and South China plate passes central Jiangxi. Since the end of the Yanshanian movement, nappe-thrusting predominated in the northern part of the Pingxiang area in the junction belt, forming large-scale thrust nappe structure, in its southern part a metamor...

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