东江流域城镇化与水生态系统服务耦合协调的时空特征及其成因OA

In the rapid process of urbanization,ensuring water ecological security and promoting coordinated and sustainable development between watershed urbanization and water ecosystem services are critically important.Currently,the coupling mechanism between urbanization and water ecosystem services remains unclear.The coupling coordination model was used to analyze the coupling coordination relationship between urbanization and water ecosystem services in the upper,middle,and lower reaches of the Dongjiang River Basin(DRB)from 1985 to 2020,and the optimal parameters geographical detector model was employed to identify the driving factors.The results indicated that:(1)Both urbanization levels and water ecosystem services in the DRB showed an upward trend.High urbanization was concentrated in the downstream areas.Water ecosystem services were higher in the downstream areas and gradually decreased towards the upstream.(2)The main types of coupling coordination in the DRB were extreme incoordination and moderate incoordination.However,the proportion of coordinated areas increased gradually,with these areas primarily concentrated in the downstream and showing a trend of expansion toward surrounding regions.The main type of relative development status in the DRB was urbanization lagging behind water ecosystem services.However,the proportion of lagging areas exhibited a declining trend.(3)Population density,the proportion of built-up land,and GDP were the dominant driving factors of coupling coordination between urbanization and water ecosystem services in the DRB.Additionally,their interactions with other factors demonstrated a significant enhancing effect,thereby increasing the explanatory power beyond that of individual factors.This study suggests that differentiated management should be implemented in areas with different levels of urbanization.Such measures are crucial for promoting the comprehensive enhancement of watershed urbanization and water ecosystem services.