Knowledge Resource Center for Ecological Environment in Arid Area
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-+ |
ISBN | 90-5410-855-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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