摘要
在我国北方干旱－半干旱区，以过去气候变化记录为主线，探讨了地质环境的变化过程及其分析方法；在时间尺度上，通过综合研究分别在青藏高原、黄土高原和华北平原建立了概念化的高分辨率气候指标（温度、降水）演化过程曲线，作为分区的特征演化曲线；在空间尺度上，对研究较深入的现代和全新世最佳期（７５００ａＢ．Ｐ．前后）、１８０００ａＢ。Ｐ．前后的冷期等时段的地质环境状况进行重建；利用空间分析计算机软件，对典型时段的地质环境状况进行连续空间分析，进而由分区特征演化曲线与典型时段地质环境空间分布模型耦合。这一分析对认识我国北方干旱－半干旱区今后的环境变化是十分有益的。
he evolution of geological environment in the arid and semi arid areas of Qinghai Xizang Plateau～Loess Plateau～North China Plain over past 0.15Ma B.P. is an important component of the global change.The pattern of landform,chlimage,soil,water and vegetaion evolved with time under the cobined action of neotectonics,climate and human activities.The chages of these factors were spatially differeent but successive and correlative.We chages of these factors were spatially different but successive and correlative.We attempted to set up a preliminary informantion analysis system of the environment evolution since Late Pleistocene for northen China using GIS technique. As GIS provides methods of information management and auxiliary analysis,it plays increasingly important role in regional analysis.It can set up the geoligical environment distribution and evolution features together with modeling analysis.GIS technique is helpful for the parameterization of information,spatial modeling analysis and can make the results vivid.The geological environment analysis information system(GEAIS) is composed of information collection,information processing,spatial analysis,mapping and output modules.The basic content of its spatical database includes topography,climate,soil,deposit feature,sea level change,hydrological environment evolution and engineering activity;the spatical analysis methods include Digital Elevation Model,Surface,Overlay,Buffer and Distance analysies. The study area is a rectangular area with the length of 3 500km from west to east and width of 1 000 km from north to south,which lies roughly between 34～41° N and 85～125° E.It consists of three topographical levels:Qinghai Xizang Plateau,Loess Plateau,North China Plain,representing the spatial features of the geological environment from west to east.The changes of neotectonics,climate and human activity as well as the degree to which they influence the geological environment were studied and the results are shown below: (1)The topographic analysis and
出处
《第四纪研究》
CAS
CSCD
北大核心
1997年第2期115-122,共8页
Quaternary Sciences
基金
地质矿产部重要基础研究院资助
