郑州市西北象限边缘区绿地景观异质性梯度分析

Gradient analysis on landscape heterogeneity of green space pattern in the urban fringe of Zhengzhou City

基于景观生态学的原理和方法,以郑州市边缘区西北象限样带为例,分析了该区域5个不同梯度绿地景观的多样性指数、均匀度指数及斑块密度等指数.结果显示,随着人类干扰度的降低,绿地景观多样性增加,景观破碎度减小,异质性先增加后降低,生态稳定性逐步增强.对不同梯度区域景观要素构成及异质性指数的分析表明,提高绿地景观多样性及维护生态稳定性,关键是通过人类适度干扰,改变现有绿地景观类型的比例,增加不断缩小的景观类型的面积;严格控制城市边缘空间扩展过程中对耕地的侵蚀,重点保护边缘绿地景观.

Based on principles and methods of landscape ecology, taking northwest quadrant transect of Zhengzhou for example,this paper analysized the green space landscape heterogeneity gradient, evenness index and patch density index of five different layers. The results showed that with the deciease of human intervention, green landscape diversity increased landscape fragmentation decreased, heterogeneity increased and then decreased, and ecological stability gradually enhanced. Analysis on the elements of the different layers in the regional landscape composition and heterogeneity index showed that the key to the improvement of landscape diversity of green landscape and maintenance of the ecological stability is modenate human interference, changing the existing green landscape type ratio, increasing the area of the ever-shrinking landscape types ; strict control of the erosion of cultivated land during the course of peri-urban spatial expansion, and focusing on protecting the edge of green landscape.