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  • CN 62-1070/P
  • ISSN 1000-694X
  • 双月刊 创刊于1981年
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生态与经济

艾比湖流域NDVI垂直梯度变化特征

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  • 1. 新疆大学 资源与环境科学学院, 新疆 乌鲁木齐 830046;
    2. 新疆大学 绿洲生态教育部重点实验室, 新疆 乌鲁木齐 830046;
    3. 新疆大学 新疆智慧城市与环境建模普通高校重点实验室, 新疆 乌鲁木齐 830046;
    2. 武汉大学 资源与环境科学学院, 湖北 武汉 430079
邓煜霖(1988-), 男, 新疆乌鲁木齐人, 硕士研究生, 主要从事干旱区资源遥感与应用研究。Email: dengyulin27@126.com

收稿日期: 2014-07-04

  修回日期: 2014-11-17

  网络出版日期: 2015-03-20

基金资助

国家自然科学基金项目(41130531, 41361045)

NDVI at a Vertical Gradient in the Ebinur Lake Basin, Xinjiang, China

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  • 1. College of Resources and Environment Sciences, Xinjiang University, Urumqi 830046, China;
    2. Key Laboratory of Oasis Ecology under Ministry of Education, Xinjiang University, Urumqi 830046, China;
    3. Xinjiang Key Laboratory of Smart City and Environmental Modelling, Xinjiang University, Urumqi 830046, China;
    2. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China

Received date: 2014-07-04

  Revised date: 2014-11-17

  Online published: 2015-03-20

摘要

利用2000-2011年MODIS-NDVI数据分析了艾比湖流域植被变化特征,以MVC法合成年最大NDVI,研究不同尺度下海拔与NDVI的关系。建立了12年的NDVI变化趋势的一元线性回归方程,结合DEM数据,分析了24等分下海拔间的NDVI变化趋势。结果显示:(1)总体上,NDVI与海拔的拟合程度较好,判定系数均大于0.88,随着等分数目减少,判定系数增大,10等分时,海拔与NDVI的相关性最大,为0.97;2 500 m为NDVI的分水岭,该海拔以下区域植被覆盖逐渐增加,以上区域植被覆盖逐渐减少;(2)研究区12年NDVI趋势变化平均值为1.03,总体属轻度改善;1 500 m以上区域植被呈减少态势,1 200 m以下植被呈增长态势;(3)各海拔带内NDVI趋势平均值为-42~54,研究区大部分像元NDVI趋势值较小,植被覆盖情况属于轻度改善和轻度退化。

本文引用格式

邓煜霖, 塔西甫拉提·特依拜, 姜红涛, 张飞, 买买提·沙吾提, 努尔麦麦提江·吾布力卡斯穆 . 艾比湖流域NDVI垂直梯度变化特征[J]. 中国沙漠, 2015 , 35(2) : 508 -513 . DOI: 10.7522/j.issn.1000-694X.2014.00173

Abstract

Vegetation is the most essential part of terrestrial ecosystem, its temporal/spatial changes in normalized difference vegetation index (NDVI) have been widely used in correlation studies. In this paper, MODIS-NDVI datasets in 2000-2011 are used for monitoring vegetation changes in the Ebinur Lake basin, MVC method is applied to make up the 12-year maximum NDVI, DEM data are divided into six intervals to revealing the relationship between NDVI and altitude; established 12-year NDVI trends by linear regression, analysis the trends of NDVI in different elevation intervals. The results showed that: (1) Overall, NDVI values comply well with elevation in six scales, with R2>0.88, elevation with 10 equal intervals and NDVI have the highest correlation, with R2=0.97; NDVI is increasing with the elevation under 2 500 m, is decreasing above 2 500 m; (2) The average of NDVI trend is 1.03 in the studied area, showing that the overall improvement of eco-environment; and it has a decreasing trend of vegetation above 1 500 m, while it shows a rising trend of vegetation blow 1 200 m in the past 12 years in the studied area; (3) In each scale, the average values of the NDVI trend are in the range of -42-54, indicating that large parts of study area are slightly improved and light degradation. The paper provide a new view to study the NDVI changes under different elevation intervals, it is of significance and value to local ecological environment construction.

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