Characteristics of LUCC patterns of the Lanzhou-Xining urban agglomeration:Based on an intensity analysis framework

Abstract

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.

Temporal—Spatial Changes in Vegetation Coverage under Climate Change and Human Activities: A Case Study of Central Yunnan Urban Agglomeration, China

“…The evaluation of vegetation coverage was heavily dependent on the transition matrix, which unfortunately only captured the increase or decrease in a particular vegetation type without providing an accurate explanation of the change process [29]. To address this limitation, we used intensity analysis [55] and intensity mapping [56] to analyze changes in vegetation coverage across three levels: time interval, category, and transition This approach allowed us to identify patterns and tendencies in vegetation changes. By understanding the current state of vegetation and its impact on the surrounding environment, we could develop strategies that promote sustainable practices.…”

“…Intensity map analyzes the intensity of transitions between different FVC levels during the same interval [56]. This method draws a map from the absolute/relative conversion intensity and intuitively interprets the conversion pattern in the same time interval.…”

“…Some studies have applied this method to changes in vegetation coverage and found that it has good adaptability to vegetation coverage with different categories [29]. However, the intensity analysis needs a more straightforward description of the actual conversion sizes [56]. We introduced the intensity map method to compare the actual and relative intensity of FVC levels and draw intensity maps to analyze the tendency/inhibition further.…”

Coupling RESI with Multi-Scenario LULC Simulation and Spatiotemporal Variability Analysis: An Ecological Spatial Constraint Approach

“…Utilizing the methodology construction by Li [37], the LULC transition intensity was constructed. This method established criteria for determining trends in absolute quantities of land category transitions, assessing potential relationships between regional LULC structures and land class transformations.…”

Interpretation of spatial and temporal changes and drivers of ecological source regions based on LightGBM-SHAP

“…Li delineated the inclinations and limitations of land category transfer in and out, examining both absolute and relative proportion levels. A map depicting LULCC intensity highlights key patterns in regional LULCC, meanwhile offering decision-making support for enhancing land resource management policies (Li et al, 2023b). Cao examined the driving mechanism for construction land use transfer using GIS platform, land use transfer matrix, expansion intensity index, hotspot analysis, and mathematical statistics (Cao et al, 2020).…”