基于E_(CPS)模型的青海湟水国家湿地公园湿地恢复评估

An E_(CPS) framework based assessment on wetland restoration of the Huangshui National Wetland Park in Qinghai province, China

恢复效果评估是湿地恢复工程评价以及湿地后续高效管理和利用的基础。以西宁湟水国家湿地公园为案例区,构建基于生态系统特征-生态系统过程-生态系统服务(ECPS)的评估体系,筛选与区域自然环境相适应的的评价因子,采用样方调查、野外监测、问卷调查等方法获取评估数据,从时空尺度评价湿地恢复区植被特征、水文过程到生态系统服务变化情况,并对影响湿地恢复的主要过程和因素展开分析和讨论。结果显示,湿地恢复的综合评价指数为41分,湿地恢复效果较好:①湿地恢复区植物增加了11种,而湿地植被的平均盖度也增加了35.5%,重点监测的三种优势湿地植物(芦苇、小香蒲和篦齿眼子菜)在单位面积上的平均生物量较参照区平均增加30.9%。②从生态过程指标来看,湿地恢复区TSIp(Total System Interflow of P)指数和FCIp(Finn Cycle Index of P)指数较参照区分别提升了37.2%和26.3%,说明湿地物质交换和循环过程有一定的改善。③从生态系统服务指标的变化来看,栖息地、土壤肥力、水质净化、大气调节、休闲娱乐服务分别增加了92.3%,50.9%,98.3%,73.8%和82.6%。④从湿地恢复的影响因素来看,湿地水深、水域面积、水温和底泥颗粒粒径大小与湿地植被恢复相关,并进一步影响湿地生态过程恢复和生态系统服务的空间分布。

The effect assessment for wetland restoration is crucial for wetland management and sustainable utilization.Applying the Huangshui National Wetland Park in the city of Xining,China as a case study,this paper describes how degraded wetland was restored in the perspective of wetland ecological characters,ecological processes and ecosystem services(ECPS).A total of 10 indicators were selected for restoration effect assessment.Vegetation sampling plots investigation,questionnaire survey method and field monitoring were used to collect assessment data.In spatial and temporal scales,we investigated how wetland vegetation,ecological processes and ecosystem services varied in response to restoration project as well as some physical indices.The research results showed that wetland restoration had a score of 41 with a level of Preferably:(1)The abundance of wetland plants increased from 31 types to 42 types with an average increase of 35.5%in plant coverage.The average biomasses of three types of monitored plants(Phragmites communis,Typha minima,and Potamogeton pectinatus)increased by 30.9%.(2)TSI_p and FCI_p in restoration area increased by 37.2%and 26.3%,respectively,indicating a certain of improvement in matter exchanges and recycles of wetland ecosystem.(3)As for the wetland ecosystem service indices,habitat,soil fertility,water purification,atmosphere adjustment and tourism increased by 92.3%,50.9%,98.3%,73.8%and 82.6%,respectively.(4)The factors of altitude,depth of water,particle diameter,etc.,exhibited certain correlations with the abundance and dominant species of wetland plants,which further influence the restoration of ecological processes and the distribution of ecosystem services.(5)With respect to the score distribution of restoration,the ecosystem service indicators scored the highest with over 80%of the total restoration score;followed by the ecological process score,accounting for about 13%of the total restoration score.The above results indicate that the primary targets of wetland restoration related researchers and managers have shifted from ecological characteristics restoration,such as wetland vegetation and wetland area,to ecological processes and ecosystem services.In general,the current framework proposed for wetland restoration assessment can well reflect the characteristics,processes and functions of wetland ecosystems,and provide a good reference for the future assessment of ecological restoration in plateau region.