Arid
Desertification watch in Tunisia: Land surface changes during the last 20 years and onwards
Escadafal, R; Bacha, S; Delaitre, E
通讯作者Escadafal, R
会议名称16th EARSel Symposium on Integrated Applications for Risk Assessment and Disaster Prevention for the Mediterranean
会议日期MAY 20-23, 1996
会议地点MALTA
英文摘要

This study of desertification is based on ground measurement of reflectance properties of the different land degradation levels recognised by field ecologists in Southern Tunisia. Landsat MSS images from 1972 onwards recorded have been superimposed after geometrical correction. Using the field reflectance data ground features of low temporal variability were taken as radiometric references. This allowed to adjust for the differences in radiometry of the images and to detect temporal variations of image-derived indices. These indices, i.e. brightness, vegetation and colour were found to be correlated with land surface parameters such as roughness, green vegetation density and soil surface composition. As a result fluctuations of areas with degraded soil and mobilised sand could be monitored as well as areas treated by wind barriers or exclosure which appear darker. The overall trend is currently a significant recovery of the ecosystems after the severe drought and eolisation of the 80's. This experiment demonstrates the feasibility of long term monitoring of arid ecosystem changes, and its potential for the implementation of desertification control programmes.


来源出版物REMOTE SENSING '96
出版年1997
页码35-+
ISBN90-5410-855-X
出版者A A BALKEMA
类型Proceedings Paper
语种英语
收录类别CPCI-S
WOS记录号WOS:A1997BH19Q00005
WOS类目Ecology ; Environmental Sciences ; Remote Sensing
WOS研究方向Environmental Sciences & Ecology ; Remote Sensing
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/292019
推荐引用方式
GB/T 7714
Escadafal, R,Bacha, S,Delaitre, E. Desertification watch in Tunisia: Land surface changes during the last 20 years and onwards[C]:A A BALKEMA,1997:35-+.
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