The Study On Interpretation And Pattern Of Karst Landscape Under The Support Of 3S Techniques

Karst mountain areas are showed as fragmented ground, barren soil, short land resources and intensive soil and water erosion. Under the study of karst landscape interpreted methods and the operation of"3S"techniques, to quickly and timely collect, store, manage, update, analyze and apply the data in correlation with surface spatial distribution, which possesses theoretical, practical and social significance for the elogical and environmental researches in karst areas. The study of karst landscape may recognize the eco-environment problem of karst vulnerability in order to improve eco-evironment and integratedly handle to scientifically set down district eco-environmental planning; finally try to entirely comprehend the landscape spatial pattern and modal to reveal the significant features and regularity which may provide scientific conclusion for establishing, planning and constituting the sustainable development tactic in order to promote the sustainable development of district economy.Firstly, the paper discusses the practice of"3S"techniques in landscape, introduce the basic condition of Qingzhen City and analyse the selection, treatment and characters of RS data; subsequently to bring forward the division system of karst landscape in Qingzhen City and establish data base of karst landscape in Qingzhen City; finally to analyze each pattern index and their pattern features of karst landscape in Qingzhen City under the operation of correlative software of landscape analysis.This paper, under the support of 3S techniques, studies the patterns of karst landscapes in Qingzhen city, Guizhou province. Firstly it divides the karst landscapes into 7 categories, that is, paddy fields, dry lands, woods, grasslands, waters, construction lands and rock desertification areas. On the basis of RS image of CBERS-1 in 2003 and under the support of RS software, the paper applies RS information model to extract the spatial data and the attributive data of landscapes in Qingzhen city and mends these data with the land-use map and the relief map of the scale 1:50000. Then under the support of ArcView3.3 and Fragstats3.3 and by the quantitive means of landscape ecology, this paper carries out the model analysis of the attributive database, including the comparison and model analysis of landscape spatial patterns, and the establishment of landscape indexes. Finally the paper, according to the spatial analysis function of GIS, extracts the value of terrain factor through Digital Evaluation Model (DEM) and analyzes the relationship of the landscape patterns and the terrain factor in order to ascertain the rule on the patterns of karst landscapes in Qingzhen city. In addition, the paper pays emphasis on the analysis of rock desertification landscape characteristics and the difference of altitudinal zonality by the terrain factor.The paper displays the following conclusion:1. The high fragmentation of karst landscape in Qingzhen City indicates the vulnerability of karst environment.2. The forest and shrub landscape turns to be the prevailing landscape and is characterized by most off-square with most irregular pattern which may be prone to interact with external environment, so has high biodiversities; but the water is...