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Study on the Evolution of Abandoned Land in Karst Mountains: A Case Study of the Valley of the Troughs (Vol. 49, No.1, Tot No.339 2021) TEXT SIZE: A A A

XU Qian1,2, LI Shanshan1, LI Yangbing1, HUANG Juan1, WANG Mengmeng1, YU Yanqun3

(1.School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China;
2.School of International Torism and Culture,Guizhou Normal University,Guiyang 550025,China;
3.No.3 Senior High School of Songtao Miao Autonomous Country 554100,China)

Abstract: China has a large area of mountains and has a large proportion of sloping arable land. The abandonment of arable land not only impacts the rational use of agricultural land in mountainous areas and the formulation of sustainable development policies, but also affects the ecological and environmental issues. In this paper, remote sensing images of Langxi trough valley in 2004, 2010, 2014 and 2017 were taken as the data sources to analyze the distribution pattern of abandoned land, evolution law, driving mechanism and the associated effects through the landscape pattern index, buffer analysis andthe trough valley elevation. The results showed that, arable land abandonment mainly occurs in hillsides and arable land on both sides of the Langxi trough valley. Taking 2014 as the demarcation point, from 2004 to 2017, the abandoned land of the Langxi Trough Valley showed a trend of first increase and then a small decrease, and the changes of the slope farmland abandoned on both sides of the Trough Valley were more obvious. In short, after analyzing the data, the evolutionary stages and patterns of arable land abandonment in the Langxi trough valley are summarized. The main reason for the abandonment is the decrease in the number of farmers and the gradual hollowing of settlements, followed by the elevation of the arable land and policy implications. The cultivated land was diversified and evolved. The land gradually became intensive and the cultivated land was degraded into the coexistence of forest, bush, and grass. The ecological environment was improved to a certain extent, which played an important role in the development of rural industries, the construction of beautiful rural areas, and ecological countryside.

Key Words: Arable land; landscape pattern; buffer; Langxi trough valley

EARTH AND ENVIRONMENT Vol.49, No.1, Tot No.339, 2021, Page 59-72

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