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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (1): 33-46.DOI: 10.11686/cyxb2015319

• Orginal Article • Previous Articles     Next Articles

Vegetation changes in Otindag sand country during 2000-2014

YUAN Zhi-Hui1, 2, BAO Gang2, *, YIN Shan1, LEI Jun1, 3, BAO Yu-Hai2, SA Chu-La1, 2   

  1. 1.College of Geographical Science, Inner Mongolia Normal University, Huhhot 010022, China;
    2.Inner Mongolian Key Laboratory of Remote Sensing and Geographic Information System of Inner Mongolia Normal University, Huhhot 010022, China;
    3.College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China
  • Received:2015-06-25 Online:2016-01-20 Published:2016-01-20

Abstract: MODIS NDVI collected during the growing season (from April to October) from 2000 to 2014 were adopted and integrated in this study to extract the time series characteristics of vegetation dynamics in Otindag sand country. The response of vegetation changes to climate data including temperature and precipitation recorded at fifteen meteorological stations were analyzed during 2000 to 2013 using annual and monthly time scales. The results revealed that regardless of the time scale (monthly or annual), the NDVI tended to increase over the 15-year observation period a result of climate and human activity Ecological restoration, indicating that ecological restoration work has produced benefits. The annual NDVI was correlated with precipitation (r=0.75), indicating that precipitation was the dominant factor in vegetation dynamics. With respect to spatial pattern, the NDVI in southern, central and northern fringe regions of the study area tended to increase but no obvious trends were observed in the central and some western areas of the region. Correlation between monthly average NDVI and climatic factors during the growing season showed that the response of vegetation change to temperature in April and May was strong, indicating that temperature was important in the early stages of the growing season. Correlation between NDVI and precipitation of the previous month were strongest from May to August revealing a hysteresis response of plant growth to rainfall. Shifting sand dunes showed the largest increase in NDVI while the smallest increase occurred in fixed sand dunes.