Biodiversity And Landscape Quality Evaluation Of Hangzhou Changqiao Stream Water Ecological Restoration Project

This paper takes Hangzhou Changqiaoxi Stream Ecological Restoration Park as the research object,and constructs the ecological evaluation index system of Changqiaoxi Stream Ecological Restoration Park based on literature analysis method,ecological evaluation and post-use evaluation.Based on the census of the whole park and the method of sample evaluation,the plant species,plant landscape status and plant community in the park were comprehensively analyzed.Firstly,the plant diversity of Hangzhou Changqiaoxi Stream Ecological Restoration Park was studied.The survey found that there are 112 species of park plants belonging to 69 families and 101 genera.Compared with the initial stage of construction,a total of 26 families,30 genera and 46 plants were added.The ratio of trees,shrubs,herbs and Stream wet plants is about 3:3:1:2.3.Evergreen broad-leaved trees,deciduous broad-leaved trees,evergreen conifers,deciduous conifers,bamboos and palms accounted for 25.0%,55.6%,5.6%,8.2%,2.8%and 2.8%of the total number of trees,respectively.The community diversity index of the park is as follows:in the margalef richness index,the arbor layer>shrub layer>the emergent plant layer>the herb layer>the submerged plant layer>the floating leaf plant layer.In the shannon-wiener index,the arbor layer>shrub layer>the emergent plant layer>the herb layer>the submerged plant layer>the floating leaf plant layer.In the simpson dominance index,shrub layer>tree>Stream plant layer>submerged plant layer>herb layer>floating leaf plant layer.In the pielou uniformity index,the submerged plant layer>the floating leaf plant layer>the emergent plant layer>the arbor layer>the shrub layer>the herb layer.Secondly,the AHP(The Analytic Hierarchy Process)analytic hierarchy process was used to establish a system of 16 criteria for evaluation.Three typical plant communities were selected for landscape quality evaluation.The evaluation score is divided into four levels of plant landscape quality grading standards of the ?,?,?,and ? grades by reference to the CEI(Comprehensive Evaluation Index)as the evaluation grading standard.There are 16 communities that meet the Grade ? landscape quality standards,12 in Grade ?,and 4 in Grade ?,accounting for 50%,37.5%,and 12.5%,respectively,and community plots without Grade ? quality standards.Based on the relevant theoretical and practical results of POE(Post-Occupancy Evaluation),based on the user's perception,a comprehensive analysis and evaluation of the comprehensive use situation after the park is completed is carried out.From the evaluation results,after more than ten years of completion of the Hangzhou Changqiaoxi Stream Ecological Restoration Park,the quality of the plant community is at a high level,the overall plant landscape quality is high,the community development is mature and stable,but there are also some nodes of the community plant landscape.Further room for improvement.