1975-2014年晋西北地区沙漠化动态变化趋势研究

摘要/Abstract

摘要： 晋西北地区位于中国北方农牧交错带上，生态环境具有较强的敏感性和脆弱性。利用1975年的MSS影像、1985-2014年TM/ETM影像等5个时期遥感影像为数据源，系统研究晋西北地区1975-2014年沙漠化土地动态变化趋势，旨在为晋西北地区沙漠化治理提供科学依据。结果表明：（1）研究区各时期沙漠化面积呈波动变化，过去40 a间，沙漠化面积总体减少了1 842.63 km²。（2）1975-2005年期间，研究区属于土地利用极缓慢速变化型，2005-2014年间研究区属于土地利用慢速变化型。（3）1975-1985年和1985-1995年，两个时期研究区沙漠化土地的空间变化以稳定型为主，所占比重分别为59.10%、68.61%，1995-2005年间沙漠化土地变化以发展型为主，所占比重为52.23%，而2005-2014年间沙漠化土地变化以逆转型为主，所占比重为54.66%。

关键词: 晋西北地区, 沙漠化, 动态变化

Abstract: Based on data extracted from remote sensing image in summer and autumn of five periods,which includes MSS image of 1975,TM/ETM image in 1985,1995,2005 and 2014,and other auxiliary data such as vegetation map,land use map,topographic map at 1:100 000,etc.,this paper conducted remote sensing interpretation and classification on remote sensing image data of every period by using ArcGIS and ENVI,and got the spatial and temporal distribution characteristics of desertification land area in northwest Shanxi Province during 1975 to 2014,based on which the article built mathematical model for dynamic degree of desertification land use in this area,and analyzed spatial dynamic variation characteristics of desertification in research area by using ArcGIS spatial overlay analysis model. The results show as follows:(1) desertification area fluctuated in every period, the total desertification area decreased by 1 842.63 km² in past 40 years;(2) land use in northwest Shanxi Province changed very slowly from 1975 to 2005 and slowly from 2005 to 2014;(3) spatial variation of desertification land in research area was stable during 1975 to 1985 and 1985 to 1995,during which the proportions of desertification were 59.10% and 68.61%,respectively;spatial variation of desertification land use from 1995 to 2005 presented a developmental mode,during which the proportion of desertification was 52.23%;while spatial variation of desertification land use from 2005 to 2014 presented a reversed mode,during which the proportion of desertification was 54.66%. To ensure the accuracy of interpretation results,we conducted field confirmation on the interpretation results of desertification in August 2015,it shows that the interpretation accuracy is 94.56%. Main innovation points of this paper include:(1) researching on desertification of the study area at 10 a scale; (2) referring to land use dynamic degree and transfer matrix while studying on the desertification in northwest Shanxi Province.

Key words: Northwest of Shanxi Province, desertification, dynamic-change

中图分类号:

P931.3

丁文广, 陈利珍, 李丹璐, 耿怡颖. 1975-2014年晋西北地区沙漠化动态变化趋势研究[J]. 干旱区地理, 2016, 39(5): 994-1003.

DING Wen-guang, CHNE Li-zhen, LI Dan-lu, GENG Yi-ying. Dynamic change trend of desertification in Northwest Shanxi Province during 1975-2014[J]. , 2016, 39(5): 994-1003.

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