城市生态公园生态敏感性分析和生态功能区划

Ecological sensitivity analysis and ecological function division in Nandan Urban Ecological Park

针对广西南丹城市周边生态系统退化的情况,利用高精度的地形数据和生态环境调查资料,在GIS技术的支持下,进行了生态敏感性评价。据此,以小班作为区划单元对研究区进行了生态功能区划。研究结果表明,研究区内敏感性级别为中度,其面积占总面积的92.99%,极度敏感区和高度敏感区的分布广泛,而不敏感的区域仅占4.14%。这表明研究区内容易出现植被退化、水土流失等生态环境问题。据此,确定了开发建设区(景观建设区Ⅰ、景观建设区Ⅱ)、生态开发管制区、生态缓冲区和生态核心保护区。无论是从面积上还是从小班数上,开发建设区都只占5%,生态用地区占到95%,这体现了以城市生态公园为主、生态效益优先的原则,同时也为城市生态公园的总体规划设计提供了规划依据与引导作用。

Aiming at the situation of ecosystem degradation in the suburbs of Nandan county,Guangxi province,the ecological sensitivity analysis and comprehensively evaluation for Nandan Ecological Park have been carried out with the support of highly accurate survey data,ecological environment investigation and the GIS technology.Hereby,the ecological function division for the area was made out based on the evaluation results and selecting sub-compartment as division unit.The dividing results show that the moderately sensitive grade regions＇ area accounted for 92.99% of the entire studied region,the extremely sensitive regions and highly sensitive regions were widely distributed in the studied region,but the non-sensitive regions were only 4.14% of the entire studied region.This caused that the studied region is easy to occur the problems of vegetation degradation and ecological environment.According to the findings,the studied region was divided into five regions： the exploitation and construction territories（landscape construction territory I,landscape construction territory II）,ecological exploitation control territory,ecological buffer territory and core ecological protection territory.No matter in respect of area or sublot number,the exploitation and construction territories only accounted for 5%,while the ecological use territory 95%,which indicates that the whole compartment sufficiently considers the requirement of building city ecological park and also reflects the principle of giving propriety to city ecological park.In this way,the ecological function division directly provides planning basis and guidance for the master plan of city ecological park.