Exploring the spatio-temporal differentiation characteristics and coupling coordination relationship of the composite ecosystem of urban agglomerations is of great significance for promoting the synergistic development and integration construction of urban agglomerations. This paper is based on LUCC data, DEM, temperature, precipitation and other multi-source data, taking the central Yunnan urban agglomeration as an example. The entropy weight method is first used to determine the comprehensive weights to evaluate the regional economic and social development level. Then, the InVEST (Integrated Valuation of Ecosystem Services and Trade-offs)model was used to quantitatively calculate and analyze the spatial and temporal evolution characteristics of the four ecosystem services, including water conservation, soil conservation, carbon sequestration services, and habitat quality. The coupling coordination model was used to quantitatively analyze the evolution of the coupling coordination of the composite ecosystems in the central Yunnan urban agglomeration during the period of 2010-2020, and to reveal its development law. The results show the following: ①During the study period, the socio-economic subsystems in central Yunnan urban agglomeration demonstrated an outward radiative growth from Kunming City, marked by underdeveloped sub-centers and prevalent low-level areas. ②Trends in ecosystem services varied, with water and soil conservation showing fluctuating increases, carbon sequestration remaining stable, and habitat quality declining. The integrated ecosystem services critically important zone is mainly located in the northeastern region and southwestern edge of the study area. ③Economic, social and ecological subsystems are highly coupled, with consistent overall development trends and strong interactions. ④The increase in the degree of harmonization amounted to 7.82%, with lagging subsystems varying in different degree of harmonization subregions. The study can provide a scientific basis for urban agglomerations to formulate scientific and reasonable development policies, promoting regional sustainable development and optimizing the spatial pattern of the national territory.

In the process of smart city construction, information security is an important factor to ensure the sustainable development of smart city. The paper focuses on information security problems in the construction of smart city, and explores the overall framework and construction contents of information security system. First of all, the paper summarizes the characteristics of smart city information system, and analyzes the requirements for information security. Then, combined with the relevant standards and norms of information security, the paper puts forward construction ideas of information security system. On this basis, the overall framework of information security system is constructed with a global perspective, which includes three systems:management system, technology system, construction and operation system. At the same time, the construction contents and guarantee strategies of each system are put forward. The establishment of information security system helps to ensure safe management and operation of smart city. This research provides a reference for the related research of information security in smart city.

Mountainous area account for 94% in Yunnan, China. Among them, cultivated land only 16.20%. In order to classify and protect cultivated land contiguous, take Huaping , a typical mountainous area as an example, and integrates the entropy weight method, TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) and spatial autocorrelation method to construct a zoning method based on CLQE (Cultivated Land Quality Evaluation). The results showed that the CLQE was divided into five grades. Class 1 and Class 2 was higher, respectively accounting for 24.98% and 29.98% of the total cultivated land area, Class 3 and Class 4 was accounting for 23.17% and 13.76%, Class 5 was the worst, accounting for 8.11%. In terms of layout, it can be divided into 4 areas, key protected areas are distributed in Class 1 and 2, accounting for 52.52% of the total, suitable adjustment areas are distributed in Class 1, 2 and 3, accounting for 9.02%, key control areas are distributed in Class 3 and 4, accounting for 25.41%, reduce reserved areas are distributed in Class 4 and 5, accounting for 13.05%. The results are consistent with the actual situation, and provide a feasible method for cultivated land classification and zoning protection.

Carrying out the simulation of urban construction land expansion is an effective way to follow the objective law of land use change, taking into account cultivated land and ecological protection, and guiding the rational expansion of construction land. It is also an important attempt to find the coordination of land space layout between planning. Taking the urban agglomeration in central Yunnan as an example, this paper selects 2000, 2005, 2009 and 2015 as research periods to analyse the spatio-temporal expansion characteristics of construction land in whole region. The results show that the overall distribution of construction land is relatively dispersion at four time points, mainly along the northeast-southwest direction, and the distribution in the southwest direction is the most concentrated. Using FLUS model simulate the construction land spatial expansion pattern by 2020 under the scenarios of planning guidance and policy restraint, and analyze the ecological effects of spatial expansion. The simulation results show that the construction land expansion area under the two scenarios is continuously increased, but the degree of expansion is different. The construction land fragmentation degree and fractal dimension have been reduced compared with the previous, and the degree of intensive utilization of construction land is increased.

Research Purpose: The aim of this study is to investigate the spatiotemporal evolution characteristics and the driving mechanisms behind the spatial patterns of land use in economically developing river basins. Research Methods: The study employed geographic information systems, spatial autocorrelation techniques, and geographic detector methods to analyze the Hanjiang River Basin, focusing on the logical sequence of "evolution process - evolution pattern - driving mechanism" in land spatial changes. Research Findings: (1) From 2000 to 2020, the comprehensive change rates for urban, ecological, and agricultural spaces in the study area were 228%, -3%, and -1%, respectively. (2) The centroid of urban space shifted from southeast to northwest, while that of agricultural space moved from southwest to northeast. The centroid of ecological space initially shifted from northwest to southeast but then reversed. Univariate and bivariate clustering features exhibited similarities. (3) The outward migration of labor-intensive industries from the Pearl River Delta was identified as a significant factor driving the spatiotemporal evolution of land spatial patterns in the study area. Significance: This study supports the implementation of land spatial planning in economically developed regions and offers insights for coordinated development in less-developed river basins.