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Remote Sensing Technology and Application  2019, Vol. 34 Issue (2): 355-366    DOI: 10.11873/j.issn.1004-0323.2019
    
Dynamic Monitoring of Grassland Vegetation Phenology in Tibetan Plateau based on EVI2 and Three Trend Approaches
Chen Siyu1,2,Liang Tiangang3
(1.National Administration of Surveying,Mapping and Geoinformation Engineering Research Center of Geographic National Conditions Monitoring,Xi’an 710000,China;
2.The First Institute of Photogrammetry and Remote Sensing,Xi’an 710000,China;
3.College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730010,China)
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Abstract  Based on grassland vegetation phenology extracting from EVI2 data sets,distribution and dynamic variation characteristic of SOG,EOG and LOG were analyzed in recent 30 years.The results showed that grassland phenology had shown an obvious regional difference from southeast to northwest in TP.The grassland vegetation in eastern and northwestern part of plateau turned green earlier and brown late,with a relatively longer growth season than other regions.The changes of grassland vegetation phenology from 1981 to 2010 in the east and west regions were also remarkable in TP.The Start of Growth Season(SOG) was in advance in eastern region,with the advanced rate of 0.49 d/a(R2=0.54).There were remarkable difference in phenology distribution and changes in different elevations and aspects.When the altitude had risen 1000 m,the SOG delayed 4 days,EOG advanced 5 days,and LOG shorten 9 days.With the increase of altitude,the SOG rate of grassland increased gradually,and LOG change rate showed a decreasing trend.In addition,SOG in south aspect was later than that in north aspect.LOG in south aspect was shorten than that in others.Average delay rate of SOG in north aspect was lower than that in south aspect.

Key words:  Tibet plateau      EVI2      Vegetation phenology      Kendall coefficient      Pearson coefficient      Theil-Sen’s median slope     
Received:  09 April 2018      Published:  10 May 2019
ZTFLH:  TP79  
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Chen Siyu, Liang Tiangang. Dynamic Monitoring of Grassland Vegetation Phenology in Tibetan Plateau based on EVI2 and Three Trend Approaches . Remote Sensing Technology and Application, 2019, 34(2): 355-366.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2019     OR     http://www.rsta.ac.cn/EN/Y2019/V34/I2/355

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