自然资源学报 ›› 2011, Vol. 26 ›› Issue (8): 1377-1386.doi: 10.11849/zrzyxb.2011.08.024

• 资源生态 • 上一篇    下一篇

太白山植被指数时空变化及其对区域温度的响应

张善红, 白红英, 高翔, 贺映娜, 任园园   

  1. 西北大学 城市与环境学院,西安 710127
  • 收稿日期:2011-01-21 修回日期:2011-03-29 出版日期:2011-08-20 发布日期:2011-08-20
  • 通讯作者: 白红英(1962-), 博士, 教授, 博士生导师, 主要研究方向为环境化学、 全球变化生态学。 E-mail: hongyingbai@163.com E-mail:hongyingbai@163.com
  • 作者简介:张善红(1983- ),女,山东日照人,硕士研究生,主要从事全球变化生态学研究。E-mail: feiyang84120@126.com
  • 基金资助:

    国家科技基础性专项重点项目(2007FY110800)。

Spatial-temporal Changes of Vegetation Index and Its Responses to Regional Temperature in Taibai Mountain

ZHANG Shan-hong, BAI Hong-ying, GAO Xiang, HE Ying-na, REN Yuan-yuan   

  1. College of Urban and Environment, Northwest University, Xi'an 710127, China
  • Received:2011-01-21 Revised:2011-03-29 Online:2011-08-20 Published:2011-08-20

摘要: 太白山地处陕西秦岭腹地中段,是秦岭最高峰。基于5月的遥感影像提取研究区NDVI数据,结合实际调查,对太白山自然保护区1979-2009年植被指数变化特征进行分析,研究不同植被带NDVI对温度变化的响应。结果表明:近30 a来,太白山5月植被指数NDVI平均值达0.2以上的面积占研究区面积的89.5%,植被整体覆盖较高;但NDVI表现出明显的垂直性差异,中低海拔区NDVI大多分布在0.2以上,而较高海拔区NDVI则主要分布在0.2~0.5区间。有56%以上的区域NDVI基本没有发生变化;NDVI增加极显著和减少极显著区占总面积的4.88%和3.92%。近30 a来,研究区年平均温度呈明显上升趋势,线性增加趋势为0.35 ℃/10 a;随着海拔的升高,各植被带NDVI对温度的变化更为敏感,高海拔植被对温度变化的敏感性远大于低海拔植被,即人为影响相对较小、但海拔相差巨大的太白山植被生态系统,已成为气候变化影响的敏感场所。

关键词: 植被指数NDVI, 温度变化, 太白山

Abstract: Taibai Mountain, the peak of Qinling Mountains, is located in the middle hinterland of Qinling Mountains. Based on NDVI data of Taibai Mountains Nature Reserve in May which were derived from remote sensing and in site survey, we analyzed the spatial-temporal changes of vegetation index for different vegetation zones during 1979 to 2009, as well as their responses to temperature. The results showed that the area where the average NDVI in May was higher than 0.2 accounts for 89.5% of the total Taibai Mountain, which indicates a good vegetation cover in the mountain nowadays. However, the significant vertical deviation was found in NDVI. The value of NDVI is generally over 0.2 for the low altitude regions while ranges from 0.2 to 0.5 for the high altitude regions. The pixles where NDVI increased and decreased significantly during the past three decades account for 4.88% and 3.92%, respectively, and no change was found in about 56% of the total pixles. The annual mean temperature in the study area tends to increase with a slope of 0.35℃/10 a during the last 30 years. The vegetation changes became more sensitive to temperature with the increase of altitude, which indicates that the ecosystem of Taibai Mountain that is characterized by a small human disturbance and a high elevation deviation has become a sensitive place responding to climate change.

Key words: NDVI, temperature change, Taibai Mountain

中图分类号: 

  • Q948