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Ludong University (2007)

Landscape Changes and Drive Forces Analysis of Typical Region in KuBuQi Desert

崔步礼;Cui Bu Li

Titre : Landscape Changes and Drive Forces Analysis of Typical Region in KuBuQi Desert

Auteur : 崔步礼;Cui Bu Li

Grade : Master’s Theses 2007

Université : Ludong University

The spatial pattern analysis is the core question in landscape ecology research. Taking aregion of KuBuQi desert, including ShuLinZhao, WangAiZhao, BaiNiJing and JiGeSiTai, as acase study, analyzed the landscape patterns and the dynamic process. Finally, we discussedthe drive forces of landscape changes, which is important to the design of local sustainabledevelopment and providing the useful database for landscape planning.This study used remote sensing images of Landsat-TM in 1987, 1995 and 2003, toanalyze the landscape characteristics and landuse changing. Firstly, the preparative workswere including geographic correction, setuping interpretive symbols, and interpretation of theremote sensing images. The geographic correction was calculated by Erdas8.6 software ; basedon field investigation, landuse maps and topographic maps, the interpretive symbols wereimported as an event theme ; landnse maps were extracted by interactive method betweenoperators and GIS (geographic information system) software ArcView3.2. Secondly,landscape pattern index were calculated by putting grid data into software Fragstats3.3. Then,under the support of software ArcInfo9.0, the vector data was converted to grid data whichwas gotten from the interactive method under several processes, including topology, cutting,and projection conversion. Finally, the study analyzed the dynamic changes of landscapestructure by using gravity center moving and conversion matrixes of landscape types,including 1987 to 1995, 1995 to 2003, and 1987 to 2003. Consequently, by adopting artificialand natural factors, this study analyzed driving forces of the changes of landscape pattern.The result indicated that the artificial factor, especially the population increase, is a principaldriving force of the landscape pattern changes.Major conclusion of this thesis as below:1. From 1987 to 2003, the patch fragmentation of the study area was decreasing, thelandscape pattern tended to be simple, the distribution of different type patches tended to beevenness. For the changes of landscape pattern in different landscape types, the resultindicated that cropland was obviously increasing and its distribution tended to be evennesstoo ; Fixed sand-dune was also increasing, and its patch shape tended to be more complicated ;Semi-fixed sand-dune, drifting sand-dune, meadow, and river flood plains were decreasing,and their distribution tended to be more fragmentized ; Riverbed were centralizing orbroadened, and its shape tended to be more complicated ; Woodland and wetland were gradually increasing and centralizing, and their patch shape tended to be simple ; Residentialarea was gradually increasing and centralizing too, and the trends of its distribution isunevenness ; The patch fragmentation of Water area was highly increasing, but its patch shapetended to be simple.2. For conversions among the different landscape types, it showed that there were fivelandscape types, including fixed sand-dune, Semi-fixed sand-dune, drifting sand-dune,meadow, and river flood plains, which were mainly exporting landscape types ; contrarily,three types, including residential area, cropland, and wetland, were mainly transfered fromother landscape types. The main conversions indicated that fixed sand-dune was transferedinto cropland and woodland ; semi-fixed sand-dune and drifting sand-dune were transferedinto fixed sand-dune ; meadow was transfered into fixed sand-dune and semi-fixed sand-dune ;cropland was transfered into residential area ; river flood plain was transfered into cropland.3. For the gravity center moving of landscape types, the larger landscape types oraverage patches area were, the less extents of gravity center moving were. Contrarily, thesmaller landscape types or average patches area were, the more extents of gravity centermoving were. For examples, cropland, fixed sand-dune, and semi-fixed sand-dune were thelarger landscape types in whose landscape percentages were more than 15%, the extents ofgravity center moving were less than 6km ; contrarily, river flood plain, woodland, andwetland were the smaller landscape types in whose landscape percentages were less than2.5%, the extents of gravity center moving were more than 15kin. These indicated that thegravity centers of small landscape types moved easily because it was facile to affact the areaof landscape types by artificial and natural factors. At the same time, the gravity centers offixed sand-dune, semi-fixed sand-dune, and drifting sand-dune turned to southern, thisindicated that the area of drifting sand-dune decreased. So the area of desertification and thedesert degree decreased too.4. The PCA (Principal Component Analysis) results showed that there were threeprimary impact factors affecting on the landscape changes, their cumulative proportion were53.98%, 22.2%, and 11.16%. For the first impact factor, the component loadings ofpopulation and GDP were bigger, and they changed from 0.919 to 0.946. For the secondimpact factor, the component loadings of relative humidity and precipitation were bigger, andthey changed from 0.833 to 0.886. For the third impact factor, the component loadings of affecting factors were all smaller. So the main drive forces included population increasing andclimate changes. Furthermore, the study advanced sustainable countermeasures based onprocess and drive forces of landscape changes.

Mots clés : KuBuQi Desert; Landscape Change; Gravity Center Moving; Driving Force; Principal Component Analysis;

Présentation (CNKI)

Page publiée le 20 mai 2013, mise à jour le 2 novembre 2017