株洲云龙示范区绿地系统生态服务功能评价与优化

Evaluation and optimization of ecological service function of greenbelt system in Yunlong demonstration area in Zhuzhou

绿地系统是城市生态系统的重要组成部分,具有重要的生态服务功能。本文运用生态服务功能指数的概念,选择涵养水源、土壤保育、营养物质积累、固碳释氧、净化大气环境、生物多样性保护这6个指标因子构建云龙示范区绿地系统生态服务功能评估模型,采用全排列多边形图示指标法对云龙示范区绿地系统的"现状绿地"、"控规绿地"、"理想绿地"3种情景下的生态服务功能进行评价和预测。研究结果表明,通过调整云龙示范区绿地系统中乔木林、灌木林、竹林、经济林和苗圃地的比例,3种土地利用情景下绿地系统生态服务功能综合指数分别为0.24、0.70和1.26,生态服务效能得到有效改善。当云龙示范区绿地系统面积大于6 612 hm2,乔木林、灌木林、竹林、经济林和苗圃地的结构比例调整为620∶20∶5∶10∶6时,绿地系统生态服务功能达到理想状态。同时在植物配置时,优先选择乡土树种,有利于绿地系统生态服务功能的发挥。

Greenbelt system is an important constituent part of urban natural ecosystem. It has important ecological service efficiency.The concept of ecological service efficiency index（ESEI） was used in this paper. Six indicatorsincluding water conservation, conservation of soil, carbon fixation and oxygen released, nutrient accumulation, atmosphere environmental purification, biodiversityconservation were selected to construct an evaluation modelof the ecological services of Yunlonggreenbelt system. The ESEI of the system was evaluated and predicted using the method of entire-array-polygon diagram index under three scenarios, including current condition, regulatory detailed planning, and ideal condition. Evaluation results show that by adjusting the structural proportion of high forest, shrubbery, bamboo forest, economic forest and nursery, the ESEI of greenbeltsystem for the three scenarios were 0.24, 0.70 and 1.26, respectively. When the area of greenbelt system in Yunlong demonstration area is more than 6 612 hm2, and the structural proportion of high forest, shrubbery, bamboo forest, economic forest and nursery adjust to 620∶20∶5∶10∶6, the ecological service efficiency of greenbelt system will be ideal condition. At the same time, we should choose the local plants firstly when deployingplants, it is useful for expressing the ecological service efficiency of greenbelt system.