城市扩张和地形因素对山地城市荒野林地植物物种多样性的影响OACHSSCD

As a special type of urban woodland,urban wilderness woodlands can effectively enhance urban ecosystem services while reducing the management and maintenance costs of urban green spaces.However,under the complex site conditions of mountainous cities,the spatial patterns and driving mechanisms of plant species diversity in urban wilderness woodlands remain unclear.This study took the central city of Chongqing,a typical mountainous high-density built-up area,as a case.Based on the field survey data of 313 sample plots,we used spatial statistical analysis methods(GeoD)to analyze the distribution characteristics and formation mechanisms of plant species diversity in urban wilderness woodlands in relation to urban expansion and topographical factors.The findings revealed that:(1)Plant species diversity in the tree layer,shrub layer,and herb layer showed significant spatial heterogeneity,with diversity levels peaking in areas with moderate urban expansion rates.(2)Urban expansion rate was the primary driving factor of plant species diversity at all layers.The tree layer and herb layer were significantly affected by terrain relief,while the shrub layer was notably influenced by the terrain niche index.(3)The interaction between urban expansion factors and terrain factors showed non-linear enhancement,with greater explanatory power than any single factor.The study revealed that urban expansion and terrain jointly shape the spatial patterns of plant species diversity in mountainous urban wilderness woodlands through mutual constraints.It is recommended that wilderness woodlands be incorporated into the green infrastructure systems in urban renewal and ecological governance,with zoned and graded protection and near-natural management implemented to enhance the ecosystem service functions and ecological resilience of mountainous cities.