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Remote Sensing Technology and Application  2003, Vol. 18 Issue (5): 286-290    DOI: 10.11873/j.issn.1004-0323.2003.5.286
    
Exploring the Temporal-Spatial Dynamics of Grasslands in Xilingol,Inner Mongolia Using AVHRR-NDVI:1999 Growing Season
WANG Zheng-xing, LIU Chuang, ZHAO Bing-ru
(Global Change Information and Research Center,Institute for Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing100101,China)
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Abstract  

This paper explores the temporal-spatial dynamics of four grasslands (temperate meadow-steppe, temperate steppe, desert-steppe, and sand steppe) in Xilingol, Inner Mongolia using 1999 monthly AVHRR-NDVI. The averaged monthly NDVIs show that there is only minor variation for desert-
steppe in whole year. Temperate meadow-steppe and temperate steppe start to grow in May, but NDVI of the other two steppes reach their nadir during the same month. June is an important period for NDVI gain of meadow-steppe and steppe. Taking April as NDVI baseline, the net gain of NDVI in whole year is 0.42for meadow, yet by the end of June, 81% of it has completed. Similarly, the NDVI net gain for temperate steppe is 0.30, and 73% of it completed before July. The spatial dynamics are characterized by an eastwest profile. The iso-line of NDVI=0.1 is between 116°-117°E in May, and pushes forward to 113°-114°E in August when all grasslands reach their potentials. Since NDVI is very sensitive to the change of vegetation density in low covered area, the shape and position of NDVI=0.1 iso-line maybe a good indicator for long term climate changes.

Key words:  Grassland      AVHRR-NDVI      Spatial change      Temporal change       
Received:  21 March 2003      Published:  24 November 2011
S 127  
  TP 79  
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Cite this article: 

WANG Zheng-xing, LIU Chuang, ZHAO Bing-ru. Exploring the Temporal-Spatial Dynamics of Grasslands in Xilingol,Inner Mongolia Using AVHRR-NDVI:1999 Growing Season. Remote Sensing Technology and Application, 2003, 18(5): 286-290.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2003.5.286     OR     http://www.rsta.ac.cn/EN/Y2003/V18/I5/286

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