地理科学进展 ›› 2009, Vol. 28 ›› Issue (5): 798-804.doi: 10.11820/dlkxjz.2009.05.019

• 生态与环境变化 • 上一篇    下一篇

基于植被指数的太原市绿地景观格局及其热环境效应

刘艳红|郭晋平   

  1. 山西农业大学 林学院|太谷 030801
  • 出版日期:2009-09-25 发布日期:2009-09-25
  • 作者简介:刘艳红(1978-)|女|讲师|硕士|主要研究方向为园林规划设计、城市景观生态。 E-mail:liuyhwqs@163.com
  • 基金资助:

    山西农业大学科技创新基金(2008010)

The Research of NDVI-based Urban Green Space Landscape Pattern and Thermal Environment

LIU Yanhong|GUO Jinping   

  1. The Forestry College, Shanxi Agricultural University, Taigu 030801
  • Online:2009-09-25 Published:2009-09-25

摘要:

以中国重要的能源工业城市太原市为研究区,借助RS、GIS等手段,以太原市1986年、1995年、2001年三个时相的TM/ETM数据为基础,应用景观生态学的理论和方法,选择归一化植被指数(NDVI)和地表辐射温度分别作为城市绿地和热环境效应的反映指标,分析城市化过程中绿地景观格局及其与热环境的变化特征;探讨城市绿地景观格局的变化与城市热环境效应的相关关系;以寻求提高城市绿地生态效益的有效途径,为日后的城市园林绿地建设提供一些借鉴。研究表明:1986-2001年间,NDVI值较大的植被覆盖情况较好的绿地逐年减少,取代以NDVI值较小的植被覆盖差的硬质半硬质景观;景观水平上,绿地景观破碎化程度加剧,各景观要素混杂程度提高;景观的多样性增加,但这样的多样性是以大量的人工干扰为前提的;各景观类型的优势度降低,分布趋于均匀。反映城市绿地景观的NDVI与反映热效应的地表辐射温度LST两者之间存在较大的负相关关系,景观格局的热环境效应随着景观破碎化程度的加剧、景观优势度降低和多样性的增加而加强,城市绿地景观的空间分布格局对其热环境效应也有着重要的影响,其中混合格局的降温效果最为明显。

关键词: 植被指数NDVI;绿地景观格局;遥感;地表辐射温度;太原

Abstract:

With the aid of RS and GIS, taking Taiyuan City as a case, which is a national important energy industrial city, landscape ecological theory and method is used to the three periods of TM/ETM data include 1986, 1995 and 2001.It takes vegetation index(NDVI) and surface radiant temperature as urban green land and the hot environment effect’s index, by this to analyze the green space landscape pattern and the hot environmental change characteristics and their relationship, and seek the effective way to improve the ecological benefits of urban green space. It can provide some experience for the future city landscape green building. The result shows that green land of better vegetation cover with the larger NDVI is decreasing, instead of hard landscape of lower vegetation cover with the smaller NDVI. The aggravation of green landscape fragmentation degree and the scattered distribution of elements of the landscape are obvious at landscape scale. The increase in the diversity of landscape is on the premise of a large number of artificial interference. The dominance of various types of landscape diminishes and the distribution tends to uniform. At the same time, there is a negative correlation between NDVI and surface radiant temperature. The effects of thermal environment in landscape pattern enhance with the increase of fragmentation degree, the dominance of landscape reduction and the increase in diversity. Urban green spatial distribution has a significant impact on thermal environment, in which mixed pattern is most obvious to cooling effect.

Key words: green space landscape pattern, remote sensing, surface radiant temperature, vegetation index NDVI