Abstract: Eco-migration is a special migration formed to improve the habitat environment and alleviate the ecological pressure, which is an important initiative to realize the United Nations sustainable development goals, and a livelihood project to promote the harmonious coexistence of human-land relationship. Due to the external migration of large-scale immigrants, it leads to abrupt and special land use changes in resettlement areas compared with general areas. [Model] This paper systematically studies the impact of the Shule River resettlement project on land use change by comprehensively applying the land use transfer matrix, information entropy, and the human activity intensity index model with the support of land use data from 1996 to 2010. [Results] The study found that: 1. The change process of land use reflects the change process from micro-change→dramatic change→smooth change in the early stage of migration→middle stage of migration→end stage of migration, and reflects the order of priority needs of life→production→ecology. 2. In the early and middle stages of migration, the grassland is mainly transformed into arable land and construction land, and in the end stage, when the migrants realize the basic “living and working in peace and contentment”, they begin to pay attention to the optimization of the living environment, and the amount of forest land increases. 3.The entropy of land use structure information and the degree of balance are both on the rise, and are closely related to the resettlement mode and scale of immigrants, with large-scale immigrant resettlement bases tending to be more diversified and balanced. On the contrary, the degree of dominance shows a decreasing trend, indicating that with the migration process, land use has gradually moved from purely favoring production (construction land) and production (arable land) to taking ecology into account. 4. The migration process is projected on the human activity intensity index, which shows stage and … Read More

Abstract: This paper comprehensively reviews the research status of cultivated land quality improvement technologies, elaborates on the existing technical achievements in detail, deeply analyzes the difficulties in the application process, and puts forward prospects for the future development direction. Through a comprehensive analysis of the research progress in key fields such as soil improvement, irrigation and drainage, fertilization, and farmland ecological protection, it aims to provide a theoretical basis and practical reference for further promoting the improvement of cultivated land quality, ensuring national food security, and sustainable agricultural development. Read More

Abstract: This paper comprehensively reviews the research on cultivated land space change. It elaborates on the background and significance of the research on cultivated land space change, and systematically analyzes the main research contents, including the driving factors of cultivated land space change, the methods and models for its analysis, and the impacts on the ecological environment. Through a summary and analysis of relevant research, it is found that the research on cultivated land space change has important theoretical and practical significance for ensuring food security, optimizing land use, and promoting sustainable development. Finally, the existing problems in current research are pointed out, and prospects for future research directions are put forward. Read More

Abstract: This study focuses on the dolomite in the Lao Gongqiao Village profile in the Huaying Mountain. By analyzing field outcrops and thin sections, two types of dolomite occurrences were identified: fine-crystalline dolomite at the bottom of the Qixia Formation and spotted dolomitic limestone in the middle to upper part of the formation. The profile also features saddle-shaped dolomitic cement. The fine-crystalline dolomite has primary porosity mainly in the form of intercrystalline (dissolution) pores, with moderate porosity and low permeability. The spotted dolomitic limestone, with limited dolomitization, has poor reservoir properties. The saddle-shaped dolomite, a later cement, reduces the reservoir space, leading to poorer reservoir performance. Read More

Abstract: Ecological management and environmental restoration of mines are the cornerstone of sustainable resource exploitation, and it is imperative to strengthen the ecological protection and restoration of mining areas. High-diving mining areas are often located in the hinterland of the plains, with high surface diving levels and proximity to urban areas, forming a unique ecosystem of land and water. Such mining areas are characterized by wide subsidence, widespread water accumulation, and challenging treatment technologies. Therefore, in view of the particularity of the high-diving mining area of Zhaogu No. 1 Mine, it is particularly important to adhere to the principle of "adapting measures to local conditions, agriculture if it is suitable for agriculture, fishing if it is suitable for fishing, and construction if it is suitable for construction". Through an in-depth analysis of the ecological and environmental problems exposed during the mining process of Zhaoguyi mine, we found that the mining area is currently facing six serious challenges: significant damage to the topography and landscape, extensive damage to natural vegetation, serious damage and illegal occupation of land resources, resulting in a sharp reduction in arable area, and unprecedented damage to the ground infrastructure. In order to solve the ecological and environmental problems left by Zhaogu No. 1 Mine, three core key technologies were studied: topography and landform remodeling technology, soil reconstruction and vegetation restoration technology, channel reengineering and road engineering technology. The synergy of these technical systems provides a comprehensive strategic planning and implementation plan for the geomorphological restoration, vegetation restoration and surface infrastructure reconstruction of the Zhaogu mining area. Through the on-site ecological restoration project of Zhaogu No. 1 Mine, this paper not only verifies the efficiency and applicability of the ecological restoration … Read More

Abstract: As an important type of transportation infrastructure in contemporary China, the construction of high-speed rail can effectively promote regional population flow and improve regional connectivity. Taking the Zhengxi high-speed railway as an example, this study uses the dynamic monitoring data of population flow from 2009 to 2013 to construct a dynamic spatial panel model by introducing the method of lagging the urban population size by one period, so as to explore the spatiotemporal effect of the construction of the Zhengxi high-speed railway on the population flow of cities along the line. The results show that the impact of Zhengxi high-speed railway on population agglomeration is reflected in the agglomeration effect and dispersion effect. The impact of Zhengxi high-speed railway on urban population agglomeration along the line is heterogeneous. Read More

Abstract: Based on the worldpop population density data, this paper compares and studies the spatial distribution and change characteristics of population in the Yellow River Basin metropolitan area since 2000, and takes the three central urban metropolitan areas of Zhengzhou, Xi'an and Jinan as examples to analyze the characteristics of population distribution change within the metropolitan area. The results show that from 2000 to 2020, there was no significant change in the population distribution pattern of the metropolitan area in the basin, and the distribution of population density showed the pattern characteristics of "high in the southeast and low in the northwest", mainly concentrated in the middle and lower reaches of the basin, and showed a decreasing trend from the downstream to the middle to the upstream. (2) The steady population growth and rapid growth areas are mainly concentrated in the metropolitan areas of Xi'an, Zhengzhou and Jinan, while the population density of the metropolitan areas of Xining, Yinchuan, Hohhot and Lanzhou in the upstream areas is significantly low, and the surrounding areas of the central city show the phenomenon of population growth stagnation and a large number of agglomeration of shrinkage areas. (3) From 2000 to 2020, the maximum population density in the metropolitan area of the three central cities continued to increase, and the trend of expansion from the central city to the surrounding cities showed in the metropolitan area, indicating that the population distribution was gradually moving towards equilibrium. Read More

Abstract: Biological Soil Crusts (BSCs) are complex surface structures of the ecosystem formed by cryptogams such as cyanobacteria, lichens, and bryophytes, together with soil microorganisms. They are widely distributed in arid and semi - arid regions. In recent years, the ecological functions of BSCs in soil nutrient cycling and carbon sequestration have gradually become a research hotspot. This paper reviews the regulatory mechanisms of BSCs on soil nutrients such as nitrogen, phosphorus, and organic matter, analyzes their contributions and potential impacts on the global carbon cycle, and discusses the threats of climate change and human disturbances to the functions of BSCs. Future research needs to further quantify the regional carbon sequestration capacity of BSCs and develop BSC - based ecological restoration technologies. Read More

Abstract: Urban renewal is one of the most important issues in contemporary urban economic development in China. With the continuous growth of the aging population and the change of the basic structure of the residents in old neighborhoods over time, it is crucial to provide community attention for the elderly in the public action areas of old neighborhoods. The article analyzes the current situation of public space in older neighborhoods and proposes strategies for creating space in older communities, aiming to provide effective suggestions for age-friendly renovation of older communities. Read More

Abstract: Under the contradiction between residents' growing demand for diversified public space and the increasing tension of available space in urban built-up areas, revitalization of surplus space has become a new trend. With land within the urban cbuilt-up areas, there is a lack of street-level public space or even lower-level small and micro-public space in the land use arrangement, therefore, starting from the low-efficiency or surplus space and transforming it into a new functional space that meets citizens' needs has become an An important way to cope with the imbalance in the distribution of public space and the diversification of residents' spatial needs. However, there is a lack of clear and systematic discussion on residual space in domestic research. Firstly, it clarifies the definition and characteristics of residual space, secondly, this paper studies the problems and reasons for the formation of some residual space, clarifies the value of residual space, discusses its subdivision and puts forward improvement opinions, and puts forward the implementation of co-creating mode, implementation and management paths, and safeguards for residual space. Read More

Abstract: Cyanobacteria bloom is one of the most serious water ecological environment problems in the world and have large impact on public health and aquatic ecosystems worldwide. The harmful effects of algal blooms not only include reduced aesthetics and recreational opportunities, but more seriously, algal toxins are produced during the outbreak, killing plants and animals in the water, threatening the safety of drinking water and quality of life of local residents. Scientific and accurate inversion of the temporal and spatial changes of cyanobacteria bloom and comprehensive and in-depth analysis of the causes of cyanobacteria bloom outbreak are the current research focus. This paper describes the main monitoring methods of cyanobacteria bloom and the influencing factors of the outbreak. Finally, through the investigation and summary of the research status of cyanobacteria bloom at home and abroad, it analyzes the existing problems in the field of research status, and finally analyzes its future development trend in related directions. Read More

Abstract: Starting with the exploration data of coalbed methane (CBM) in the Shoushan block, this study analyzes the distribution of the main coal seam and the layout of the mined-out wells in the coal-bearing strata of this area. The main coal seam in this block belongs to the Permian system. It is characterized by considerable thickness and high gas content. According to the relevant industry standards for calculating CBM volume, and based on the data from drilled wells, the estimated CBM resources are approximately 2.5×10⁸ m³, with a resource abundance of 0.46×10⁸ m³/km², indicating favorable prospects for CBM development in this block. Read More

Abstract: China has abundant coalbed methane resources, comparable to conventional natural gas, with huge development potential. However, low-permeability and low-pressure coal reservoirs are widely developed, and single well production is generally low. Nitrogen hydraulic composite transformation is a potential technology to break through the efficient development of coalbed methane in low-permeability and low-pressure coal reservoirs. In order to study the influence of nitrogen hydraulic composite action on the evolution characteristics of pore and fracture structure in coal reservoirs, the Gaohe No. 3 coal in Lu'an mining area was taken as the research object. A nitrogen hydraulic composite transformation experimental device was built to carry out nitrogen transformation and nitrogen hydraulic composite transformation related experiments. The original coal samples and the coal samples modified by three methods were compared and analyzed through high-pressure mercury injection experiments to characterize the pore structure characteristics of the coal samples in the study area. The conclusion is as follows: The nitrogen hydraulic composite transformation in the Lu'an mining area has the effect of expanding and increasing the capacity of pores, causing the expansion and connectivity of transitionpores in coal to transform into large, medium, and micro cracks. The pore volume in the stage of pore size below 2nm is smaller after nitrogen and nitrogen hydraulic composite transformation, while the pore volume in the stage of pore size above 2nm increases; The improvement effect of pores after nitrogen transformation is relatively significant, and the pores are further improved after nitrogen hydraulic composite transformation. Read More

Abstract: In recent years, the quantity and quality of water resources play an increasingly important role in economic development, social progress and people's healthy life, etc. The situation of water resources directly affects the scale of urban development and the development pattern of regional economy. Based on the DRASTIC model assessment, the groundwater dynamics and vulnerability in Xuchang City are analyzed. The results show that the change of shallow groundwater level is consistent with the change of precipitation on the whole, and the groundwater level drops due to the excessive exploitation in successive years. The change of middle and deep groundwater level is mainly affected by artificial exploitation, and the water level decreases year by year. Due to the implementation of mining restrictions around 2000, the shallow and middle deep water levels recovered slightly. The groundwater vulnerability level in Xuchang City is poor to good, and the vulnerability zoning results gradually increase from northwest to southeast, which is related to the lithology and permeability coefficient of the vasses zone. Read More

Abstract: The maturity of the Chang 7 shale in the Niejiahe section of the Tongchuan area of the Ordos Basin was studied based on Rock–Eval parameters, vitrinite reflectance, sterane isomerisation parameters, and aromatic methylphenanthrene parameters. The reflectance of vitrinite is 0.55% - 0.64%, and the value of Tmax is from 429°C to 453°C, which indicate the Chang 7 shale from the Niejiahe section is in the immature-low mature stage. While the isomerization parameters of C29 steranes reflect the maturity interval from 0.7% to 0.8%, and the equivalent vitrinite reflectance calculated from the methyl phenanthrene ratio of Chang 7 shale is from 0.74% to 0.86%, both of which indicate the Chang 7 shale has reached the mature stage. These reflect the significant suppression of vitrinite reflectance in the Chang 7 shale. There is a significant negative correlation between the vitrinite reflectance and the content of chloroform asphalt “A” and HI, indicating that the suppression of vitrinite reflectance is influenced by the infection of bitumen on vitrinite and hydrogen-enriched vitrinite. Therefore, when evaluating the hydrocarbon generation potential of Chang 7 shale based on vitrinite reflectance, the suppression of vitrinite reflectance should be considered. Read More

Abstract: This study addresses the complex geological conditions of the upper gateway in the 2304 working face of Anyang Main Coking Coal Mine. Using the UDEC numerical simulation method, the displacement and stress distribution laws of surrounding rock under different support conditions were analyzed. The results show that reasonable support measures can effectively control roadway deformation and improve surrounding rock stability, providing a theoretical basis for similar engineering projects. Read More

Abstract: During the mining process of the 5011 comprehensive mining face of Ma Di Liang Coal Mine, the coal body is crushed, resulting in a large amount of dust being generated when the comprehensive mining machine cuts the coal body. Through the study of the temporal and spatial evolution laws of dust dispersion during coal mining operations, the sources of coal dust are analyzed, the influencing factors of the water injection effect in the coal seam are studied, the mechanism of dust reduction by water injection in the coal seam is revealed, and the water injection process for the 5011 comprehensive mining face is formulated. Finally, the dynamic and static collaborative water injection method is adopted to effectively ensure the uniformity and progress of water injection on the working face, thereby achieving significant dust reduction effects. The research results have significant implications for the dust control and safe production of Ma Di Liang Coal Mine. Read More

Abstract: Coal, as a crucial primary energy source in China, provides a stable energy supply and security for the nation's economic and sustainable high-quality development. However, gas disasters can lead to severe casualties and significant economic losses. Therefore, accurately and efficiently predicting gas emission is of paramount importance and holds significant practical value for the safe production of high-gas mines. This paper employs the Least Squares Support Vector Machine (LSSVM) model, which offers better regression prediction accuracy for nonlinear problems with small datasets. To enhance the model's prediction accuracy and effectiveness, the Grey Relational Analysis (GRA) method is used to analyze the influencing factors of gas emission. Factors with high correlation are selected as model inputs. Experimental results show that coal seam gas content, coal seam depth, coal seam thickness, adjacent seam gas content, adjacent seam spacing, mining face length, and adjacent seam thickness have high correlation. To validate the results, Kendall's tau-b, Pearson, and Spearman correlation analysis methods are used, and the experimental results align with GRA. Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and Improved Simulated Annealing Algorithm (ISA) are employed to find the global optimal solution for the LSSVM model parameters. Finally, the GRA-GA-LSSVM, GRA-PSO-LSSVM, and GRA-ISA-LSSVM models are constructed and tested. Experimental results show that after applying GRA, the RMSE and MAE metrics decrease, while the R² metric increases, proving that the GRA method optimizes the model. The GRA-ISA-LSSVM model has the lowest RMSE and MAE values and the highest R² value, indicating superior performance in static gas emission prediction. Read More