Ecological changes assessment based on remote sensing indices: A case study of Changning City
LUO Chun1, LIU Hui1,2, QI Luyue3
1. College of Environment and Resources, Fuzhou University, Fuzhou 350108, China; 2. Institute of Remote Sensing and Information Engineering, Fuzhou University, Fuzhou 350108, China; 3. Spatial Information Research Center of Fujian Province, Fuzhou University, Fuzhou 350108, China
Abstract:Using remote sensing methods to assess regional ecological change can achieve a long cycle and immediate results. The authors employed remote sensing eco index (RSEI) method to monitor the erosion of the ecological changes, with Changning City as the study area. 1990, 2002 and 2009 Landsat TM remote sensing images were chosen as data sources, from which 4 ecological factors were extracted, i.e., green degree, humidity degree, heat degree and dry degree, as indicators of evaluation model. Combined with principal component analysis, the authors quantitatively and objectively assessed regional ecological changes in the past 20 years. The results show that remote sensing Eco Index (RSEI) method seems to be a good method for evaluating the effect of ecological restoration in soil erosion area. It is proved that RSEI eco-index value increased by 22.39%; nevertheless, excellent level of eco-area ratio decreased from 13.086% in 1990 to 4.006% in 2002 and then rose to 16.699% in 2009, which indicates that the ecological quality of this region has been greatly improved after 20 years' soil erosion control. Through the investigation and analysis of Changning City, the authors have found that main prevention measures, such as afforestation and construction, have exerted greater effects on the improvement of the ecological quality.
罗春, 刘辉, 戚陆越. 基于遥感指数的生态变化评估——以常宁市为例[J]. 国土资源遥感, 2014, 26(4): 145-150.
LUO Chun, LIU Hui, QI Luyue. Ecological changes assessment based on remote sensing indices: A case study of Changning City. REMOTE SENSING FOR LAND & RESOURCES, 2014, 26(4): 145-150.
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