Ziyuan Kexue (Mar 2023)
Characteristics of LUCC patterns of the Lanzhou-Xining urban agglomeration:Based on an intensity analysis framework
Abstract
[Objective] Based on the land use transition matrix, a criterion of land use types conversion trend in absolute quantity was established, and a land use/cover change (LUCC) intensity analysis framework was proposed to analyze the tendency and inhibition of the conversion trend between land use types and its impact on the land use/cover structure from the perspectives of absolute and relative intensity. [Methods] The LUCC intensity map was constructed to visually display the key LUCC modes. Taking the Lanzhou-Xining urban agglomeration as an example, this study carried out an empirical analysis. [Results] During 2010-2020, the conversion characteristics of different land use types are not completely the same in the Lanzhou-Xining urban agglomeration. The LUCC intensity map integrated absolute and relative intensity information, which could reflect the regional general patterns of LUCC, such as the tendency of the transition from cropland to construction land and the low intensity of the transition from water to forest. It can also reveal the specific change patterns of the Lanzhou-Xining urban agglomeration that is a key area of urbanization in the ecologically fragile western region of China. It showed a tendency of land transition from unused land to water, grassland to cropland, and construction land to unused land. However, under the influence of the melting of glaciers and snow, permafrost degradation, precipitation enhancement, the acquisition-compensation balancing policy, and the poor management and protection of land consolidation projects, the characteristics of systematic tendency, absolute tendency, and relative tendency can be observed respectively in the changes. Further comparison with the land use transition matrix and land use transition Sankey diagram shows that there is no direct correlation between absolute intensity and relative intensity, and the constructed intensity analysis framework and map are less affected by the proportion of land use types and the overall LUCC intensity of the region, which is more helpful to determine the conversion trend between land use types and its impact on the land use/cover structure. [Conclusion] The framework of intensity analysis proposed in this study is feasible and can provide a scientific support for identifying and analyzing the key patterns and modes of regional LUCC and optimizing land resource management policies.
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