草业学报2017，Vol.26Issue(11)：12-21,10.DOI:10.11686/cyxb2017023
基于遥感分析13年来石羊河上游山区植被变化研究
Monitoring vegetation dynamics in the mountainous area of the Shiyang River upper reaches using remote sensing technology
摘要
Abstract
NDVI (the normalized difference vegetation index) is the most commonly used index for monitoringvegetation growth conditions and coverage.In this study,Landsat TM images were collected during the vegetation growth periods of September 2002 and 2015 in the mountainous area of the Shiyang River Basin's upper reaches in the Qilian Mountains.The two periods' NDVI were calculated and vegetation dynamics were analyzed by using ENVI 5.2 software.In addition,the images were analyzed using supervised classification and principal component analysis so that the areas and changes of vegetation types could be calculated.Results showed that vegetation areas with high,medium and low coverage had decreased in 2015 compared to 2002 by 18.4％,13.4％ and 10.1％ respectively.Vegetation areas with extremely high and extremely low coverage increased by 0.5 ％ and 26.6 ％ respectively.NDVI results showed that the degraded and improved areas of vege-tation were 6935.6154 and 6595.2834 km2,accounting for 51.26％ and 48.74％ of total area respectively.Analysis of vegetation type areas showed that the area of arbor forest had significantly increased by 108.75 ％,while the areas of shrub forest and grassland had significantly decreased by 49.87％ and 19.78％ respectively.These findings show that forest vegetation in the upper reaches of the Shiyang River Basin has degraded over the 13-year period.关键词
植被覆盖/NDVI差值指数/监督分类/石羊河上游山区Key words
vegetation cover/NDVI difference index/supervision and classification/mountainous areas in the upper reaches of Shiyang River引用本文复制引用
张永,杨自辉,王立,魏怀东,惠晓雅,张剑挥,王强强,郭树江,詹科杰..基于遥感分析13年来石羊河上游山区植被变化研究[J].草业学报,2017,26(11):12-21,10.基金项目
国家林业公益性行业科研专项经费(201404306),甘肃省基础研究创新群体项目(1506RJIA155)和甘肃省科技支撑计划项目(1604FKCA095)资助. （201404306）
