Analysis of land use changes and their driving force in "Two Lakes and One Reservoir" area of central Guizhou Province based on the concepts of "Source and Sink"

LI Qingsong; SU Weici; LYU Sisi

doi:10.11932/karst2021y34

Volume 41 Issue 6

Dec. 2022

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LI Qingsong, SU Weici, LYU Sisi. Analysis of land use changes and their driving force in 'Two Lakes and One Reservoir' area of central Guizhou Province based on the concepts of 'Source and Sink'[J]. CARSOLOGICA SINICA, 2022, 41(6): 928-939. doi: 10.11932/karst2021y34

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LI Qingsong, SU Weici, LYU Sisi. Analysis of land use changes and their driving force in "Two Lakes and One Reservoir" area of central Guizhou Province based on the concepts of "Source and Sink"[J]. CARSOLOGICA SINICA, 2022, 41(6): 928-939. doi: 10.11932/karst2021y34

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Analysis of land use changes and their driving force in "Two Lakes and One Reservoir" area of central Guizhou Province based on the concepts of "Source and Sink"

doi: 10.11932/karst2021y34

LI Qingsong^{1, 3
,},
SU Weici^{1, 2
,
,},
LYU Sisi²

1.
College of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China
2.
Institute of Mountain Resources of Guizhou Province, Guiyang, Guizhou 550001, China
3.
Natural Resources and Planning Bureau of Pingshan County, Pingshan, Sichuan 645350, China

Received Date: 2021-04-08
Available Online: 2023-01-06

Abstract

Abstract

"Two Lakes and One Reservoir", the main drinking water source of Guiyang City and even the urban agglomeration in central Guizhou, are typical karst plateau lakes. But the ecological environment around the lakes and reservoir is extremely fragile, where human activities are intense; urbanization is expanding rapidly; and land use changes are significant. Therefore, the land use changes have an important impact on the regional ecological security/water supply security and social and economic development. Based on the concepts of "source and sink" and the 4-phase interpretation data of remote sensing in "Two Lakes and One Reservoir" area in central Guizhou Province from 1998 to 2018, the dynamic model of land use was used to analyze the dynamic evolution law of land use in the study area in the past 20 years. Besides, quantitative analysis and qualitative analysis were combined to explore the driving force of land use changes. Results show that, (1) From 1998 to 2018, forest land and arable land were always the most important types of land use in the "Two Lakes and One Reservoir" area, with their respective proportions exceeding 35% in each period. (2) During the study period, the areas of construction land, forest land and unused land (mainly temporary unused land) increased continuously; the fluctuation of water area decreased; and the areas of arable land and grassland decreased continuously, among which changes of construction land and unused land presented most actively in each period. (3) The annual average dynamic degree of comprehensive land use in the study area increased repectively from 1.33% in 1998-2008 to 2.4% in 2008-2013 and 2.3% in 2013-2018. In the past 10 years, under the background of accelerated regional industrialization, urbanization and agricultural and rural modernization, the mutual conversion between various categories of land use has been more frequent than 10 years ago. (4) From 1998 to 2018, the main "source and sink" conversion relationships of land use in the study area were shown as the conversion of arable land into forest land and construction land, and grassland into forest land and arable land. Arable land was the main "source" of construction land increase; forest land was the main "sink" of arable land; and arable land and forest land were the main "sink" of grassland. (5) The "source and sink" coefficients of variation of mutual conversion among different categories are quite different, among which the "source" coefficient of variation of unused land converted to grassland is the largest (110.14%), and the annual average conversion is the most unstable. The "source"coefficient of variation of grassland converted to arable land is the smallest (19.84%), and grassland is the most stable source of farmland. (6) The conversion from various types of land into construction land has been accelerated; the area of the built-up area has expanded rapidly; and the water supply pressure of "Two Lakes and One Reservoir" has further increased. Population pressure and economic development are the main driving factors for the expansion of construction land in the study area. Policy factors such as Returning Farmland to Forest Program and the establishment of the "Two Lakes and One Reservoir"Administration Bureau have an important impact on the change of forest land and water area. In the future, it is necessary for us to focus on and solve the contradiction between the rapid urban expansion and the protection of arable land and water sources in the "Two Lakes and One Reservoir"area. The research results can provide a reference for the land use planning and social-economic-ecological coordinated development in the "Two Lakes and One Reservoir" area.
- concepts of "source and sink",
- land use,
- driving force,
- "Two Lakes and One Reservoir" area,
- karst area

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References(27)

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Analysis of land use changes and their driving force in "Two Lakes and One Reservoir" area of central Guizhou Province based on the concepts of "Source and Sink"

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Analysis of land use changes and their driving force in "Two Lakes and One Reservoir" area of central Guizhou Province based on the concepts of "Source and Sink"

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