Research on the index system and evaluation method for ecological services of river shorelines
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摘要:
河流岸线是构成河流自然生态空间的重要组成部分,近年来受人为活动影响,河流岸线生态服务功能受到破坏,为精准开展河流岸线修复,亟需制定有针对性的河流岸线生态服务功能评价指标体系和评价方法。对河流岸线的类型、结构进行了分析,在国内相关研究成果以及水利、生态环境、海洋等行业有关技术规范的基础上,依据科学性、全面性、独立性和可操作性原则,经过初步梳理和综合遴选筛选了河流岸线生态功能评价指标;综合相关技术规范以及研究成果,确定了各评价指标的效用赋值,并制定河流岸线生态服务功能评价方法。结果表明:1)河流岸线可分为生态保护型岸线与生态修复型岸线,前者可细分为植被良好型、沙漠型以及岩石型3类,后者可细分为堤防型、农田型、村落型、养殖塘型、城镇型、河口型以及复合型7类。河流岸线具有防洪、控制侵蚀、保护水质、生物栖息、景观功能5项生态服务功能。2)构建的河流岸线生态服务功能评价指标体系包括目标层、准则层和指标层,其中目标层为河流岸线生态服务功能,准则层为河流岸线所具备的5项生态服务功能,指标层包括防洪达标率、堤防安全、植被覆盖率、岸坡稳定性、排污口布局合理程度、生态缓冲带状况、生物多样性指数、植物群落状况、水鸟状况、景观生态价值、景观舒适度11项评价指标,对各项指标根据总体评价进行五级效能赋值。3)运用层次分析法确定各评价指标的权重,采用多属性效用理论计算河流岸线生态服务功能综合指数,将河流岸线生态服务功能划分为优、良、中、差、极差5个等级,以评价河流岸线生态服务功能状况。研究可为识别河流岸线生态问题、评估河流岸线生态修复成效、健全河流岸线管理长效机制等提供依据和参考。
Abstract:River shorelines are important components of the natural ecological space of rivers. In recent years, human activities have affected the ecological service function of river shorelines. In order to accurately carry out the restoration, it is urgent to develop a targeted evaluation index system and evaluation methods for the ecological service function of river shorelines. The type and structure of riverfronts were analyzed. Based on the relevant domestic research results and relevant technical specifications of water conservancy, environmental protection, marine and other industries, the ecological function evaluation indicators of riverfronts were preliminarily sorted out and comprehensively selected according to the principles of scientificity, comprehensiveness, independence and operability. Based on relevant technical specifications and research results, the utility values of each evaluation index were determined, and the evaluation method of riverfront ecological service function was developed. The results indicated that: 1) River shoreline could be divided into ecological protection type and ecological restoration type, the former could be subdivided into good vegetation type, desert type and rock type, and the latter could be subdivided into 7 types, including dike type, farmland type, village type, aquaculture pond type, town type, river mouth type and compound type. The riverfront had five ecological service functions: flood control, erosion control, water quality protection, biological habitat and landscape functions. 2) The constructed evaluation index system of river shoreline ecological service function included target layer, criterion layer and index layer. The target layer was the river shoreline ecological service function, and the criterion layer was the five ecological service functions corresponding to river shorelines. The index layer included flood control compliance rate, dike safety, vegetation coverage, bank slope stability, reasonable degree of sewage outfall layout, ecological buffer zone status, biological diversity index, plant community status, water bird status, landscape ecological value, and landscape comfort. The utility values of each indicator were defined as five grades based on the overall evaluation. 3) AHP was used to determine the weight of each evaluation index, and multi-attribute utility theory was used to calculate the comprehensive index of riverfront ecological service function, and the riverfront ecological service function was divided into five grades, i.e. excellent, good, medium, poor and extremely poor, so as to evaluate the status of riverfront ecological service function. This study could provide basis and reference for identifying ecological issues, evaluating the effectiveness of ecological restoration, and improving long-term mechanisms for river shoreline management.
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表 1 各评价指标赋分标准和效用赋值
Table 1. Scoring standards and utility values for each evaluation indicator
准则层 指标层 赋分标准 评价
等级效用
赋值准则层 指标层 赋分标准 评价
等级效用
赋值防洪功能 防洪达
标率≤50% 极差 −1 保护水质 生态缓冲带状况 Aa不低于80%,Wplant为10~15 m(单侧) 良好 0.5 50%~70% 差 −0.5 植被均为森林等乔木,
Wplant≥15 m(单侧)最佳 1 70%~85% 一般 0 生物栖息 生物多样性指数 <1 极差 −1 85%~90% 良好 0.5 1~2 差 −0.5 ≥95% 最佳 1 2~3 一般 0 堤防安全 极不安全 极差 −1 3~4 良好 0.5 不安全 差 −0.5 ≥4 最佳 1 基本安全 一般 0 植物群落状况 难以观测到植物 极差 −1 较为安全 良好 0.5 植物种类单一,植株数量很少且稀疏 差 −0.5 非常安全 最佳 1 植物种类尚多,植株数量不多且散布 一般 0 控制侵蚀 植被覆
盖率≤5% 极差 −1 植物种类多,配置较合理,植株数量多 良好 0.5 5%~25% 差 −0.5 植物种类很多,配置合理,植株密闭 最佳 1 25%~50% 一般 0 水鸟状况 任何时候都没有见到 极差 −1 50%~75% 良好 0.5 种类少,难以观测到 差 −0.5 >75% 最佳 1 种类、数量比较少,偶尔可见 一般 0 岸坡稳
定性0 极差 −1 种类、数量比较多,常见 良好 0.5 <25 差 −0.5 种类、数量多,有珍稀鸟类 最佳 1 25~50 一般 0 景观功能 景观生
态价值缺少自然或人文景观,景观连通性差 极差 −1 50~75 良好 0.5 自然或人文景观匮乏,
景观连通性一般差 −0.5 75~100 最佳 1 自然或人文景观观赏价值一般,区域连通性强,没有代表性 一般 0 保护水质 排污口布局合理
程度饮用水源一级保护区存在排污口,D>0.5个/km,Lsmax>2 km,或Ltmax>1/2河宽 极差 −1 自然或人文景观完善,观赏价值高,有区域代表性 良好 0.5 饮用水源二级保护区存在排污口,D为0.2~0.5个/km,Lsmax>1 km,或Ltmax介于1/4~1/2河宽 差 −0.5 自然或人文景观价值高,地域特色明显,具有水利科普宣传价值 最佳 1 饮用水源准保护区存在排污口,D为0.1~0.2个/km,Lsmax≤1 km,或
Ltmax小于1/4河宽一般 0 景观舒
适度景观破坏严重,岸线侵占问题突出 极差 −1 饮用水水源保护区内无排污口,D<0.1个/km,仅排污控制区有排污口,且不影响邻近水功能区水质达标,其他水功能区无入河排污口 良好 0.5 自然景观与人文景观不协调,观赏性差,缺少游憩、服务和管理设施 差 −0.5 河流水域岸线内无排污口 最佳 1 环境较协调,景观体验一般,游憩、服务、管理设施建设不完善 一般 0 生态缓冲带状况 乔木面积占比(Aa)低于20%,植被带宽度(Wplant)<2 m(单侧) 极差 −1 环境质量好,公众满意度较高,游憩、服务、管理设施建设完善 良好 0.5 Aa不低于20%,Wplant为2~5 m(单侧) 差 −0.5 景观和谐,环境质量好,公众满意度高,游憩、服务和管理设施完善 最佳 1 Aa不低于50%,Wplant为5~10 m(单侧) 一般 0 表 2 河流岸线生态服务功能综合指数的评价标准
Table 2. Evaluation criteria for ecological service function comprehensive index of river shorelines
ESI 综合评价等级 (0.5, 1] 优 (0, 0.5] 良 0 中 [−0.5, 0) 差 [−1, −0.5) 极差 -
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