| Rivers are of great significance to the development of human society.The Yanhe River basin is located in a typical loess hilly gully area,which has formed a river valley and river channel spatial system under hydraulic erosion,and also formed river channel towns that are adjacent to the river development,with complex topography and limited urban development space,resulting in the ecological environment in the river corridor area of the main section being constantly disturbed and damaged by human activities.At present,the development goal of the Yellow River ecological protection and high-quality development plan outline is to further improve the human-water relationship,and the degree of hemeroby will help to quantify the extent of human activities on the river space.Therefore,this study is based on hemeroby,and the study of the response and optimization of the landscape pattern of the river corridor in the main section of the Yanhe River is of great practical significance to solve many problems of river protection and development in the Yanhe River basin.This study takes the river corridor of the main section of the Yanhe River basin as the study area,applies the theory and method of hemeroby and landscape pattern,uses the research steps of feature evaluation-pattern response-pattern optimization,firstly analyzes and summarizes the research progress of hemeroby and landscape pattern response and optimization methods,secondly constructs the river corridor of the main section of the Yanhe River basin by using land use elements,socio-economic elements,topographic factors and infrastructure elements.Then,we analyzed the response relationship between the two at the scale of the whole area and the scale of the local river section,and then proposed the optimization method of the river corridor landscape pattern in the main section of the Yanhe River and put forward the optimization strategy.The main conclusions of the study are:(1)For the evaluation of hemeroby,the hemeroby area is mainly concentrated in the central region at the global scale;the spatial distribution of hemeroby at the local scale shows the characteristics of high in the south and low in the north,and decreasing along the river channel;the spatial distribution of hemeroby at the plain section shows the characteristics of patchy distribution in the north,concentrated distribution in the middle and zero distribution in the south;the spatial distribution of hemeroby at the estuary section shows the characteristics of The spatial distribution of hemeroby in the estuary section shows the characteristics of high in the north and low in the south.(2)For the response relationship between hemeroby and landscape pattern,the hemeroby mainly affects the regional landscape diversity index at the global scale;at the local scale,the correlation between hemeroby and landscape index is higher in the estuary section,followed by the river source section and finally the plain section;in addition,the critical threshold of hemeroby in the river corridor area of the main section of Yanhe River is decreasing year by year,and the anti-disturbance ability of the area is gradually weakening.(3)For the landscape pattern optimization strategy,the landscape pattern optimization strategy is proposed to explore based on the idea of landscape unit-landscape element.The study helps to comprehensively understand the relationship between anthropogenic activities and river spatial pattern in the main section of the Yanhe River,and proposes optimization strategies to solve the practical problems such as the contradiction between the spatial pattern of river corridors and the scale of town expansion,the poor environment of river floodplains and landscape fragmentation,which is of great practical significance to promote the integration and optimization process of river corridor space in the Yanhe River basin.The findings of the study can provide theoretical and methodological support for the spatial planning of river corridors in the Loess Plateau region,and provide ideas for the quantitative study of anthropogenic interference in the Loess Hills and Gullies. |
