南水北调中线水源区2000—2015年森林动态变化遥感监测

doi:10.11707/j.1001-7488.20190410

Abstract

Abstract: [Objective] Monitoring the spatial distribution pattern of forest in the water source area of the middle-route of the south-to-north water diversion project from 2000 to 2015 and studying the process mechanism of forest dynamic change provide a theoretical basis for forest ecosystem protection and water quality safety in the study area.[Method] Based on the 30 m resolution HJ-1 A/B CCD images(2010, 2015)and Landsat TM images(2000), the object-based decision tree classification method was used to obtain the land cover and the pixel dichotomy model for fractional vegetation coverage(FVC)estimation by NDVI.[Result] The classification accuracy K value went up to 89.4%, 86.9% and 84.4%, respectively and the user's accuracy of forest was 98% in 2000, 96% in 2010 and 94% in 2015. The result showed that the acreage of forest increased continually from 2000 to 2015, and mainly transferred from grassland, cropland and construction land, due to the implementation of ecological projects, such as Grain for Green. However, because of the mass migration and the continuous development of regional economy, part of the forest acreage turned to cropland, grassland and construction land. Due to the remarkable implementation of ecological projects, in the statistical analysis of cities, the increments of forest area in Shiyan city and Ankang city were the most, reaching 1 383.9 km² and 1 344.8 km²,respectively. From 2000 to 2015, the FVC of forest increased with a rate of 25.4%. The acreage with FVC above 0.6 took account of the largest proportion of forest area.[Conclusion] In summary, not only the acreage of forest, but also the FVC of forest both increased significantly. Thus the quality of forest in the water source area has been improved generally, which form the vegetation protective layer on the surface to reduce the risk of water erosion and ditch erosion, so as to improve the soil and water conservation capacity of the water source area.

Key words: forest, fractional vegetation cover, the middle-route of the south-to-north water diversion project, object-based classification

CLC Number:

S757

Gao Wenwen, Zeng Yuan, Liu Yu, Yi Haiyan, Wu Bingfang, Ju Hongbo. Forest Dynamic Monitoring by Remote Sensing from 2000 to 2015 in the Water Source Area of the South-to-North Water Diversion Project[J]. Scientia Silvae Sinicae, 2019, 55(4): 97-107.

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Forest Dynamic Monitoring by Remote Sensing from 2000 to 2015 in the Water Source Area of the South-to-North Water Diversion Project

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