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

Deng Yulin, Tashpolat Tiyip, Jiang Hongtao, Zhang Fei, Mamat Sawut, Nurmamatjan Obulkasim

doi:10.7522/j.issn.1000-694X.2014.00173

Journal of Desert Research >

2015 , Vol. 35 >Issue 2: 508 - 513

DOI: https://doi.org/10.7522/j.issn.1000-694X.2014.00173

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

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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.

Key words： vegetation cover; vertical gradient; MODIS-NDVI; DEM

Cite this article

Deng Yulin, Tashpolat Tiyip, Jiang Hongtao, Zhang Fei, Mamat Sawut, Nurmamatjan Obulkasim . NDVI at a Vertical Gradient in the Ebinur Lake Basin, Xinjiang, China[J]. Journal of Desert Research, 2015 , 35(2) : 508 -513 . DOI: 10.7522/j.issn.1000-694X.2014.00173

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