摘要
为揭示德阳市建成区2007年-2018年植被覆盖变化情况,文章利用2007年、2014年和2018年3个时期的遥感影像数据,采用归一化植被指数和像元二分模型估算建成区植被覆盖度并完成等级划分,分析其时空分布特征及转化规律。结果表明:2007年以中低覆盖为主,占总面积的44.54%,2014年以高覆盖为主,占总面积的30.37%,2018年以极低覆盖为主,占总面积的43.15%,2007年至2018年极低覆盖面积增加54.24 km2,平均每年增加约4.93 km2;3条典型剖面的植被覆盖度变化值都是以0为中心上下波动,峰值、谷值交替出现,不同时段存在较大差异;11 a间植被覆盖以变差为主,其中轻微变差和变差共占总面积的60.83%,植被覆盖明显变差的区域是建成区北面和南面。
The aim of this paper was to reveal the changes of vegetation cover from 2007 to 2018 in Deyang city.The remote sensing images in 2007,2014 and 2018 were taken as the data resource,then the normalized vegetation index and pixel binary model were used to calculate the vegetation coverage in built-up areas,and the grades were divided as well. The spatial-temporal evolution was also investigated.The results showed that the medium and low vegetation coverage occupied about 44.54% of the total areas in 2007,but high vegetation coverage was about 30.37% in 2014.In 2018,the vegetation coverage was extremely low,accounting for 43.15% of the total area. The extremely low vegetation coverage increased 54.24 km^2 from 2007 to 2018,with an average annual increase of about 4.93 km^2.The changes of vegetation coverage in the three typical sections were all fluctuations up and down around zero,with peaks and valleys appearing alternately,and there were large differences in different time.The vegetation coverage was mainly deteriorating during the 11 years,the slight deterioration and the deteriorating accounted for 60.83% of the total area.The areas where the vegetation coverage significantly deteriorated were the north and south of the built-up area.
作者
李海峰
LI Haifeng(Sichuan College of Architectural Technology,Deyang 618000,China)
出处
《内蒙古农业大学学报（自然科学版）》
CAS
北大核心
2020年第5期32-37,共6页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
国家自然科学基金项目(41672325)
四川省教育厅自然科学重点项目(16ZA0428)
四川省教育厅自然科学创新团队项目(16TD0040)
德阳市2017年第二批应用技术研究与开发项目(2017ZZ064)。
关键词
遥感影像
像元二分模型
植被覆盖度
时空演化
德阳市
Remote sensing image
dimidiate pixel model
fractional vegetation coverage
time and space evolution
Deyang city
