长汀水土流失区地表裸土动态变化及生态分析  

Dynamics of Exposed Bare Soil Cover and Ecological Status in the Soil Loss Area of Changting County

作　　者：林思乡 徐涵秋[1] 林中立 

机构地区：[1]福州大学环境与资源学院福州大学遥感信息工程研究所福建省水土流失遥感监测评估与灾害防治重点实验室,福建福州350108

出　　处：《福建林业科技》2015年第3期7-12,39,共7页Journal of Fujian Forestry Science and Technology

基　　金：国家科技支撑计划项目(2013BAC08B01-05)

摘　　要：为了对福建省长汀县水土流失进行动态监测,并对其治理成效进行评价,基于Landsat卫星影像和遥感信息技术,将裸土指数(NDSI)和不透水面指数(NDISI)相结合,提取长汀县2001—2013年的地表裸土信息,从而对该县近12 a来的地表裸土进行时空变化分析;同时基于遥感生态指数(RSEI)对长汀县裸土变化的生态响应进行分析。结果表明:长汀县地表裸土面积在12 a间有了大幅度的减少;而生态状况则随之好转,生态级别为优、良等级所占的面积比例均有上升。回归分析表明,各年份的地表裸露度与RSEI生态值都呈现明显的线性负相关关系,说明长汀县近12 a生态质量的改善与地表裸土面积的大量减少有直接的关系。To investigate and monitor the current situation of soil erosion in Changting county,and evaluate the progress of water-soil conservation work,this study combined the normalized difference soil index （ NDSI） and the normalized difference impervious surface index （ NDISI） to extract bare soil information, based on the time-series Landsat images of Changting county and remote sensing technology,and then analyzed the spatiotemporal variation of bare soil distribution from 2001 to 2013.Meanwhile,an ecological anal-ysis of Changting county based on the remote sensing ecological index （ RSEI） was conducted.Results show that the area of bare soil in Changting county has been greatly reduced,and the ecological status has been improved.The proportion of excellent and good eco-logical grades has raised,while the low ecological grades have an overall downward trend.Analysis of regression showed that surface exposed degree and RSEI value have presented a significant linear negative relationship.This clearly shows that the improvement of ecological quality has a direct relation with the substantial reduction of exposed bare soil areas of Changting county in this 12 years.

关 键 词：水土流失 裸土指数 不透水面指数 遥感生态指数 长汀县 

分 类 号：S714.7[农业科学—林学]