Assessment of Land Ecological Security from 2000 to 2020 in the Chengdu Plain Region of China

Abstract

The purpose of land ecological security (LES) assessment is to evaluate the influence of land use and human activities on the land ecosystem. Its ultimate objective is to offer decision-making assistance and direction for safeguarding and rejuvenating the well-being and effectiveness of the land ecosystem. However, it is important to note that there are still significant uncertainties associated with current land ecological safety assessments. This paper presents a comprehensive evaluation model that combines the strengths of subjective and objective weighting methods. The model is built upon an index system developed using the Pressure-State-Response (PSR) framework. To verify the level of LES, theThe results of classifying the total ecosystem service valueTotal Ecosystem Service Value are utilized to verify the level of LES. Furthermore, spatial distribution patterns of regional land ecological safety levels are analyzed using statistical techniques, such as Moran’s I, Mann–Whitney U-test, and Kruskal–Wallis H-test. The findings indicate that: (1) theThe evaluation model developed in this paper achieves a validation accuracy of 75.55%, indicating that it provides a more accurate reflection of the level of land ecological safety in the region; (2) The ecological security index is generally safe, with a mean value in the moderate safety range. It experienced a turning point in 2010, showing initial deterioration followed by improvement, mainly due to the transition between unsafe and relatively safe zones. (3) The level of economic development, topography, and urban-–rural structure are significant factors influencing the spatial concentration of LES in the region, ultimately shaping the spatial pattern of LES in the Chengdu Plain region.

Spatial Spillover Effects of Urbanization on Ecosystem Services under Altitude Gradient

“…The reason is that the plain area is relatively rich in resources that are easy to obtain, population and industrial agglomeration lead to the excessive consumption of resources and environmental damage, and the large-scale expansion of construction land undermines the stability of the original regional ecosystem, having a negative impact on ecosystem services. This is consistent with the results obtained by Zhang et al using the pressure-state-response (PSR) framework [25]. In addition, the ecosystem service index in the plain area showed a spatial distribution of low in the middle and high in the periphery, and the ecosystem type in the plain area was relatively simple, while the regional self-regulation ability and the ability to resist human disturbance were poor.…”

“…To date, a large number of studies have explored the horizontal and regional differentiation characteristics of urbanization's impact on ecosystem services through data description and quantitative analyses [17][18][19][20][21][22][23][24] and have proven that altitude factors may have potential impacts on urbanization and ecosystem services [25][26][27][28][29], but the specific law of urbanization's impact on ecosystem services under altitude gradient is still unclear. However, studies have shown that mountains account for up to 33% of the world's land area and are home to 26% of the world's population, 27% of which is urban [5].…”

Research on Fuzzy Evaluation of Land Environmental Security in Three Provinces of Northeast China

“…This indicated that government implementation programs on land issues have the highest impact on the quality of land resource security. Regions in the three northeastern provinces should formulate relevant land resource protection policies to adjust for the negative socioeconomic and natural environmental pressures on land resources, establish a sustainable land resource environment, formulate land ecology safeguard policies in accordance with the current status of local land ecology, strengthen environmental protection efforts, further optimize the industrial structure while improving economic development and residents' income, enhance energy conservation and emission reduction, reduce pollutant generation and emission, raise awareness of environmental protection, and reduce waste discharge [29,30]. Establish early warning and protection mechanisms against natural disasters, strengthen protection measures against soil erosion and other natural disaster, encourage the continuous and profitable use of land, increase the resilience of land ecosystems to natural calamities, and better achieve improved ecological land security in the three northeastern provinces.…”

Analysis of Spatial and Temporal Variation and Influencing Factors of Rural Land Dependence from the Perspective of Human-Land Relationship

“…Lastly, economic benefits are also an important goal of human-land relationships in rural areas, and the income brought by land is a key factor in measuring whether it can retain farmers. If the income brought by land can offset the cost and have a certain surplus, it can promote the human-land relationship to some extent [34]. Farmers invest a lot of time, labor, and equipment, and the output and benefits of land must meet certain standards, satisfy farmers' living expenses, and be economically feasible, so that rural areas can retain famers.…”