| The change of landscape pattern is the result of the intersection of natural evolution and human activities.Studying the evolution of landscape pattern and exploring its driving forces can help the rational use of land resources and thus promote the sustainable development of the region.The water network area in southern Jiangsu has always been a pioneering area for construction and development in China,and the intertwined water network system constitutes an intricate and complex system,presenting a unique ecological complexity.With the accelerated urbanization process,its landscape pattern has produced large changes.The study starts from the perspective of landscape pattern,quantitatively assesses the landscape pattern evolution characteristics and driving factors in the southern Jiangsu water network area,grasps the landscape pattern evolution trend in the study area,and provides scientific theoretical basis for the construction and optimization of ecological network in the southern Jiangsu water network area,so as to realize the sustainable ecological and economic development of the southern Jiangsu water network area.This paper selects Wujiang District as the research object,and follows the line of"theoretical research-current situation research-landscape pattern analysis-problem investigation-ecological network construction-optimization strategy proposal-On the basis of theoretical analysis and current situation research,we analyze and compare the characteristics of landscape pattern evolution in Wujiang District and explore its driving factors,and clarify the problems that occur in the process of landscape pattern evolution in Wujiang District.On this basis,the ecological network of Wujiang District is constructed and an ecological network optimization strategy is proposed.The findings of the study show that:(1)From the spatial and temporal changes in land use in Wujiang District: the land use pattern in Wujiang District produced significant changes between 1990 and2020,with the area of arable land decreasing and its dominance in the whole study area weakening.The area of construction land,water and grassland has increased,and the landscape pattern still needs reasonable configuration and further optimization.(2)From the evolution characteristics of the landscape pattern at the type level in Wujiang District: cultivated land occupies the largest area in the study area and is the dominant landscape in Wujiang District.During the study period,the fragmentation of arable land was significant,the complexity of patch types increased,and the connectivity of patch types decreased;the fragmentation of construction land patch types decreased,the complexity of patch types decreased,and the connectivity of patch types was high and stable;the fragmentation of water patch types decreased,the connectivity of patch types increased,and the complexity of patch types increased;the fragmentation of woodland and grassland patch types was not significant,and the complexity of patch types was low.The complexity of patch types is low.From the perspective of the evolution of landscape pattern in Wujiang District,the spatial fragmentation of land types,the decrease of landscape connectivity and the increase of landscape complexity during 1990-2020.In addition,with the diversification of land use forms,the overall landscape diversity in the study area is enhanced and the overall balance of the landscape is increased.(3)By exploring the driving factors of landscape pattern evolution in Wujiang District,it is found that socio-economic factors are the main reason for the change of landscape pattern in Wujiang District.Natural factors are secondary factors,which control the land use changes in the general environmental context and play a subtle role in the landscape pattern evolution of Wujiang District.In addition,policy and regulation factors also have a strong influence on the regional land use structure change,thus influencing the landscape pattern of Wujiang District.(4)Using morphological spatial pattern analysis and landscape connectivity to identify ecological source sites,and using the minimum cumulative resistance model and gravity model to extract important ecological corridors,the ecological network of Wujiang District is constructed.Through morphological spatial pattern analysis and landscape connectivity evaluation,10 ecological source patches were selected,which have good ecological environment foundation;45 potential ecological corridors were generated in Wujiang District based on the minimum cumulative resistance model,among which 16 were important corridors,mainly located in the central-eastern and northern parts of the study area,and the remaining 29 were general corridors,mainly located in the western part of the study area.It is found that the spatial distribution of ecological corridors in Wujiang District is uneven and the degree of connection is relatively fragile,which needs to be optimized and strengthened.(5)The study proposes strategies to optimize the ecological network of Wujiang District from the levels of source protection,corridor planning,node construction and planning control.The specific contents include:(1)Strengthening the protection and management of ecological source sites in the region and balancing the spatial distribution of green spaces to strengthen the foundation of the regional ecological network;(2)Rational planning of ecological corridors to form a structurally stable corridor network and enhance the connectivity of the ecological network;(3)Strengthening the construction of ecological nodes to enhance the stability of the ecological network;(4)In response to the existing ecological problems,the government should implement macro-control of driving factors to safeguard the ecological quality of the landscape pattern.Through quantitative analysis of the landscape evolution characteristics of the southern Jiangsu water network area,the study analyzes the ecological problems that occur during the development of the area and explores the causes.The aim is to provide a scientific theoretical basis for the sustainable development and ecological protection of the southern Jiangsu water network area,and to provide a scientific basis for rural planning and development. |
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