合肥城市绿地系统的景观生态评价

LANDSCAPE ECOLOGICAL EVALUATION OF URBAN GREEN LAND SYSTEM IN HEFEI

城市绿地作为城市结构中的自然生产力主体,在城市生态系统中起着重要的作用。为科学合理地评价合肥城市绿地系统的景观生态现状,建立较为全面、科学的评价指标体系,运用景观生态学的原理和方法,选取多样性指数、均匀度指数、破碎度指数、分离度指数、分维度指数、连通性指数等8个景观指数对合肥市城市绿地系统的景观格局进行研究和分析。研究结果表明,合肥市城市绿地生态格局总体上较好,绿地率和人均公园绿地面积较高;但也存在绿地分布不均,各种类型相差较大,破碎度较高,多样性程度不高,分形维数指数偏低,绿地景观的自然性和复杂性不够,连通度较低等问题。针对存在的问题,提出了合肥城市绿地景观生态规划的优化建议。研究结果为合肥市城市绿地景观生态系统的规划、设计提供了生态学依据,为"生态园林城市和森林城市"建设提供了理论依据。

Urban green,as the main body of the natural productivity of the urban structure,plays an impor tant role in the urban ecosystem. For scientific and reasonable evaluation of the landscape ecological status of urban green space system in Hefei,and creating a comprehensive and scientific evaluation index system, this paper analyzed the urban green land landscape pattern in Hefei by the landscape ecological principles and methods. This study selected eight evaluation indices,such as diversity index, evenness index,separa- tion index,isolation index, fractal dimension index, and connectivity index, etc.. The results of the study showed that the whole city was good generally. Green rate and park green area per capita were high. The o- verall performances of the structure in urban landscape green space are as follows. The district development was not balanced;green space type distribution was uneven;the difference between different types was too large;the separation index was high;the diversity was not high; the fractal dimension was low; the green landscape naturalness and complexity was not enough;the connectivity was low and so on. Aiming at solving these problems, some suggestions on the ecological planning of urban green land landscape in Hefei were put forward. The results could provide a theoretical basis for the construction and designing of the green landscape ecological system in Hefei,and it could provides a theoretical basis for the construction of the ＂ecological garden city and forest city＂as well.