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Remote Sensing Monitoring for Ecological Rehabilitation Project in Liangdang County |
Ouyang Xue-zhi1, WEI Hong-qing2 |
(1. Water and Soil Conservation Science Department of GanSu Province, Lanzhou 730000, China;2. Water and Soil Conservation bureau of Gansu Province, Lanzhou 730000, China) |
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Abstract Water and soil conservation ecological rehabilitation is an effective measure of environmental protection, which mainly depends on self rehabilitation ability of nature and under the precondition of strengthening preventability protection and the assistant measure by manpower. The water and soil loss in large area would be controlled initially in a shorter time period and the regional environment will be restored step by step , and the harmonious coexist between human and nature will be realized finally. The Liangdang County is located in the southern Qinling Mountain and in the Jialing River water system ,
which belongs to one of the eight experimental counties of implementing the Water and Soil Conservation Ecological Rehabilitation Project in the upper reaches of the Yangtze River. The study area with total area of 327. 26 km2 was selected in the northern county where was the key region of water and soil loss and the ecological rehabilitation project was carried out from 2001 to 2003. In order to cooperate with the evaluating of the project, the Remote Sensing (RS) and the Geographic Information System (GIS) techniques were used to perform the monitoring and analysis in the study area. The change status of environment types in study area and the assistant measure effect of returning forest and grass from cultivated land, convert ing slope cultivated land into engineering terrace and catchments irrigation in the ecological rehabilitation were evaluated by remote sensing monitoring at the beginning (2001) and after 2 years (2003) of carrying out the project, contrast analysis combined with referencing conventional observation data. The research results showed that the vegetation status have changed obviously since carrying out the project, the coverage rate of vegetation raised from 86. 50% to 98. 04% , increased by 11. 54% , which also showed that the environment develops toward reversion direction. The higher resolution satellite data (TM , SPOT 4, and SPOT 5) can be used for remote sensing monitoring in ecological rehabilitation project and effect evaluation of the project actualizing.
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Received: 18 February 2006
Published: 27 September 2011
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