【作者】 汪冬冬；

【导师】 杨凯；

【作者基本信息】 华东师范大学 ， 环境科学， 2010， 硕士

【摘要】 河流退化是当今世界各国河流生态系统面临的主要问题,城市化进程的加快,河流滨岸带,尤其是城市河流滨岸带生态系统遭受人类的干扰而严重退化。退化评价是保护和修复河流滨岸带生态系统的重要手段之一,亦是河流整治与可持续管理的有效依据。基于此背景下,尝试城市河流滨岸带生态系统退化评价研究,对于城市河流滨岸带整治的规划及管理具有重要的理论及现实意义。本文广泛研究相关文献资料,在阐述国内外河流滨岸带的研究进展及退化机理的基础上,指出城市河流滨岸带的内涵。从河流健康评价、现状评价与生态恢复及重建后评价三方面总结澳大利亚、美国、英国、瑞典、南非和中国等国家的河流滨岸带相关评价实践,并构建评价因子数据库。本文根据城市河流滨岸带的横向结构,尝试从滨水带、护岸带、缓冲带、近岸带4个方面来表征河岸带生态系统的退化状况。结合上海地区城市河流滨岸带的自身特征,通过确定评价指标、评价原则、评价标准和评价模型等步骤,初步构建包括滨水带、护岸带、缓冲带、近岸带4个一级指标,23个二级指标的城市河流滨岸带生态系统退化评价指标体系。本文实证研究以上海段苏州河为例,选取其干流43个河段为评价单元,结合遥感影像解译与实地调研,构建指标数据库,度量河岸带综合状况指数(Riparian Comprehensive Situation Index, RCSI);运用SPSS软件中的ANOVA分析及Spearman相关分析方法,识别不同区位、用地类型及河流两岸的退化程度以及退化因子间的响应规律,进而提出河岸带整治规划及修复策略。同时,本文初步探讨了苏州河滨岸带的范围,并运用Pearson相关分析研究河岸带用地类型变化的水环境效应。实证研究表明：①RCSI分布于3.79-25.03范围内,69.8%河段严重退化或极度退化；②高于85%河段的滨水带及护岸带严重退化或极度退化,滨水带宽度和护岸类型是其主要影响因素；大于50%河段的近岸带严重退化或极度退化,不透水面积率和设施丰富度是其关键限制因子；③人类活动强度、城市化进程等原因导致以及多数指标在不同区位、不同用地类型以及河流两岸中存在显著差异,而滨水带宽度、护岸坡度、侵蚀程度、α多样性指数和纵向连通性等方面无显著性差异；④RCSI与各一级指标及多数二级指标之间显著相关；⑤基于控制面源污染及提供生物廊道功能的河岸带范围为5.19-30.00m,基于提供航运码头或工业用地功能的河岸带为0.00-7.00m,基于提供景观休憩和公众居住功能的河岸带为6.00-30.00m；⑥100mbuffer的景观廊道能够较好的反映河岸带用地类型演变带来的水环境效应。更多还原

【Abstract】 River degradation becoming the primary problem faced by the river ecosystem of countries all over the word. With the accelerating process of urbanization, riparian zone, especially urban riparian ecosystem suffers serious degradation because of human interference. Degradation assessment is not noly the important means of protect and repair the riparian zone ecosystem, but also is the effective proof of river regulation and sustainable management. Based on this background, try to study on riparian ecosystem degradation assessment of urban river is useful abstractly and practically for urban riparian zone for planning and management regulation.Literatures and references are complete studied, research progress and degradation mechanism of riparian zone at home and abroad are described. Based on which, connotation of urban riparian zone is showed. Practices on assessing riparian zone in Australia, United States, British, Sweden, South Africa and China are concluded from river health assessment, status assessment and ecological restoration and reconstruction after-assessment three aspects, and evaluation factor database is established.Based on horizontal structure of riparian zone, the paper try to characterization of riparian ecosystem degradation degree from waterfront zone, revetment zone, buffer zone and nearshore zone four aspects. With consideration of the characteristics of urban riparian zone in Shanghai, a degradation assessment system of riparian ecosystem of urban river is established with 4 first-grade indexes (including waterfront zone, revetment zone, buffer zone and nearshore zone) and 23 second-grade indexes after determining the assessment indicators, assessment principle, assessment standards and assessment model.Suzhou Creek in Shanghai is selected as the study case for practice, whose natural characteristics are under significant destruction and degradation due to rapid urbanization.43 reaches were selected as the assessment units on the main stream of Suzhou Creek, constructs indicators database using the method of remote sensing image interpretation and spot investigation, measures the Riparian Comprehensive Situation Index (RCSI). Then it identifies the level of degradation interprets and the RCSI response to reaches location, land use types and two banks on the basis of ANOVA analysis and Spearman correlation analysis, and put forward remediation planning and restoration strategies. Meanwhile, the paper preliminary discussed the scope of riparian zone of Suzhou Creek, and the environmental effects of riparian land-use change of urban river are studied on the basis of Pearson correlation analysis.The results show that:(ⅰ) The riparian comprehensive situation of Suzhou Creek is in the poor grade with RCSI distributing from 3.79 to 25.03, and no reach is in the minimal degradation, and 69.8% reaches belongs to serious and extreme degradation grade; (ⅱ) River channelization and revetment hardening of Suzhou Creek result in more than 85% reaches of the waterfront and revetment zone status belonging to serious and extreme degradation grade, the width of waterfront zone and type of revetment are the key factors to the grade. Though 72.1% reaches of the buffer zone status belongs to slight and moderate degradation grade, irrational vegetation structure and single species problems are still remained. Rapid urbanization makes more than 50% reaches of the nearshore zone status belonging to serious and extreme degradation grade, and impervious area ratio and facilities richness degree are the crucial factors to the grade; (ⅲ) The results of analysis of variance (ANOVA) reveal that human activity intensity and urbanization are the key forces to cause RCSI and most of other indexes having significant differences in reach location, land use types and two banks, while waterfront zone width, revetment slope, erosion degree, a diversity index and longitudinal connectivity have no significant differences; (ⅳ) It has most significant correlation among RCSI, first-grade indexes and second-grade indexes. (ⅴ) The scope of riparian zone based on function of control point source pollution and provides biological corridor range of 5.19-30.00m. The scope of riparian zone based on function of the shipping dock or industrial land range of 0.00-7.00m, The scope of riparian zone based on function of open and public housing range of 6.00-30.00m; (ⅵ) 100m buffer landscape corridor is better reflects the environmental effects of riparian land-use change of urban river.更多还原