Remote sensing investigation and normalization monitoring of grassland resources in karst——a case study in Guanyang County

doi:10.11686/cyxb2017094

Abstract

Abstract: This study reports research conducted in Guanyang county, in the Guangxi Zhuang Autonomous Region, to compile a database of grassland resources. Based on the results of the second national land survey, high resolution remote sensing images (Worldview-Ⅰ and Worldview-Ⅱ) and slope and soil data from the digital elevation model (DEM), we used the object-oriented method to identify the type, area and spatial distribution of grassland resources in the karst mountain area. By the analyzing the correlation between grassland resource classification and land use status classification and the results of the modified second annual national land survey, we successfully normalized the monitoring survey of karst mountain grassland resources and compared the results with the second survey and the annual national land change survey. The data showed that in 2012, the area of grassland resources in Guanyang county was 20829 ha, including 711 ha of tropical tussock, 16246 ha of tropical shrub tussock, and 3871 ha tropical shrub tussock, with scattered trees. These areas total 32125 ha less than was recorded in the first grassland resources survey in 1986. Through analysis of the land use change survey results from 2012 to 2016, the database of grassland resources in Guanyang county was updated. The area of grassland resources in Guanyang county in 2016 was 20744 ha, 85 ha less than in 2012. Agricultural development, unused land reclamation, urban expansion, and landslides and other natural disasters, were factors contributing to the reduction of the grassland area in Guanyang county. This study provides a scientific basis for the development and utilization of karst mountain grassland resources and government decision making.

SHI Sha-na, TANG Chuan-yong, XIE Bing-geng, LIU Min, QIN Chang-wen. Remote sensing investigation and normalization monitoring of grassland resources in karst——a case study in Guanyang County[J]. Acta Prataculturae Sinica, 2018, 27(1): 14-21.

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