Study On Landscape Evaluation Of River Corridor In Daqing River Basin

The river corridor in Daqing River Basin has a profound impact on the development of its surrounding areas.Due to the large population in the basin and the rapid development of urbanization,it has stimulated the contradiction between economy,society and ecological environment.Not only the river ecosystem is affected,but also the river corridor landscape in the basin is greatly damaged.How to create a good river corridor landscape,meet people’s needs for living environment and recreational space,and realize the harmonious unity between landscape value and ecological function is also a hot issue in recent years.The evaluation of the river corridor landscape in Daqing River basin can provide a reference basis for its landscape planning,and is also of great significance to optimize and improve the existing landscape of the river corridor.(1)Firstly,this paper summarizes the relevant theoretical research and practical experience at home and abroad,sorts out the basic knowledge concepts related to the evaluation work,determines the research content and research methods,and puts forward the selection principles of evaluation indicators.Then,the construction of river corridor landscape evaluation index system in Daqing River Basin is carried out based on analytic hierarchy process.(2)Natural ecology,visual aesthetics and social cultural landscape are determined as the criterion layer,and then the factors of the primary index layer are screened and optimized through dispersion analysis.Finally,19 evaluation index factors such as plant diversity,landscape diversity,landscape fragmentation,green space rate,water filling degree,plant color richness and culture are selected,The landscape evaluation model of river corridor in Daqing River Basin is constructed.According to the principle of analytic hierarchy process,the judgment matrix is constructed,the weight of each index is determined,and each index in the evaluation model is explained.(3)Obtain the relevant data of the river corridor through sampling method and field measurement,take representative sample sections,identify the high-definition remote sensing satellite images of the selected sample sections.visually interpret the landscape element types,draw the land use map of the river corridor in the study area in GIS software,and distinguish the landscape types,such as water area,forest land,grassland,aquatic,emergent vegetation,etc,Collect and analyze its spatial data to obtain quantitative index data;Obtain the scoring results of qualitative indicators by issuing questionnaires.Then,the constructed evaluation model is applied in practice.(4)The evaluation results show that the comprehensive evaluation grades of the three rivers selected in the study area are good,among which the river corridor landscape of Baigou diversion river is the best,Zhaowangxin river is the second,and the Bao river is relatively poor.Baigou river diversion has the best comprehensive performance in natural ecological indicators,indicating that its river corridor has the most stable ecological environment;Zhao Wangxin river has the best score in visual aesthetics,thanks to its high filling degree and relatively best water transparency.The river corridor landscape of Bao river has great room for improvement.It is deeply affected by the surrounding towns and villages,resulting in its poor performance in landscape diversity,green space rate,river buffer belt width,water transparency and other indicators,resulting in its relatively low comprehensive evaluation score.Finally,according to the evaluation results,the optimization and promotion strategy of landscape is put forward.In view of the problems of river corridor landscape in Daqing River Basin,this paper puts forward appropriate plant collocation,increasing necessary landscape facilities and other improvement measures,and pursues the harmonious and unified effect of ecological landscape,visual landscape and cultural landscape.