CAJ | 학술논문

为研究漓江流域近15年植被覆盖度变化情况，以1991、2000、2006年3个时相的TM/ETM＋影像为基础，采用基于归一化植被指数（NDVI）的像元二分模型对漓江流域植被覆盖度进行估算，分析了植被覆盖度时空变化特征；结合研究区地质数据，进一步分析地质条件对植被覆盖度的影响。结果表明：①受气候和人类活动的影响，1991-2000年漓江流域植被覆盖度有所增加，表现为高和较高植被覆盖区面积增加，中度、较低和低植被覆盖区面积减少；2000-2006年漓江流域植被覆盖度略有降低，表现为高植被覆盖区面积减少，较高和中度植被覆盖区增加，较低和低植被覆盖区面积减少；②由于地质条件的影响，非岩溶区的平均植被覆盖度高于岩溶区，两者的变化趋势与流域整体变化基本一致；③从空间分布上看，1991-2006年漓江流域植被覆盖度的变化较显著。
위연구리강류역근15년식피복개도변화정황，이1991、2000、2006년3개시상적TM/ETM＋영상위기출，채용기우귀일화식피지수（NDVI）적상원이분모형대리강류역식피복개도진행고산，분석료식피복개도시공변화특정；결합연구구지질수거，진일보분석지질조건대식피복개도적영향。결과표명：①수기후화인류활동적영향，1991-2000년리강류역식피복개도유소증가，표현위고화교고식피복개구면적증가，중도、교저화저식피복개구면적감소；2000-2006년리강류역식피복개도략유강저，표현위고식피복개구면적감소，교고화중도식피복개구증가，교저화저식피복개구면적감소；②유우지질조건적영향，비암용구적평균식피복개도고우암용구，량자적변화추세여류역정체변화기본일치；③종공간분포상간，1991-2006년리강류역식피복개도적변화교현저。
In order to study the vegetation coverage changes of the Lijiang river basin in 15 years,with Landsat TM/ETM+data of 1991,2000 and 2006 as data sources,by dimidiate pixel model based on NDVI,the vege-tation coverage of the Lijiang river basin is evaluated and characteristics of temporal-spatial changes are analyzed in past 15 years.From the geological data in the study area,influences of the geological conditions to vegeta-tion coverage are analyzed.Results are described in three aspects:①Because of the climate and human activi-ties,the vegetation coverage in the Lijiang river basin got a rise in 1991 -2000.The area of high and higher vegetation coverage districts increased,while that of middle,low and lower vegetation coverage districts de-creased.Vegetation coverage got a decrease in 2000-2006.The area of high vegetation coverage districts de-creased,higher and middle vegetation coverage districts increased,while that low and lower vegetation cover-age districts decreased;②Due to the influence of the geological conditions,the average vegetation coverage in non-karst area is higher than that in karst area,but the overall trend consistent with changes in the Lijiang river basin;③Spatial distribution of vegetation coverage changes are significant in the Lijiang river basin during 1991 -2006.