EVI,spatiotemporal change,empirical orthogonal function (EOF),Gurbantunggut Desert ,"/> Spatiotemporal Change of EVI in the Gurbantunggut Desert from 2000 to 2018

Arid Zone Research ›› 2019, Vol. 36 ›› Issue (6): 1512-1520.

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Spatiotemporal Change of EVI in the Gurbantunggut Desert from 2000 to 2018

YANG Yi1, 2, WU Shi-xin1, ZHUANG Qing-wei1, 2, NIU Ya-xuan1, 2   

  1. 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China

  • Received:2019-01-18 Revised:2019-04-16 Online:2019-11-15 Published:2019-11-15
  • Supported by:
    国家科技基础资源专项项目(2017YF101004)资助

Abstract: Based on the MODIS EVI data, the spatiotemporal change of EVI in the Gurbantunggut Desert was studied using the one-dimensional linear regression analysis, empirical orthogonal function (EOF) and variable coefficient. The results showed that the interannual variation of EVI in the Gurbantunggut Desert from 2000 to 2018 was in a significant increase trend with an increase rate of 0.016 0·(10a)-1 (P<0.01), and it on fixed dunes, semi-fixed dunes and mobile dunes was also in a significant increase trend. The variation trend of EVI in the whole desert and different types of the deserts was similar in growth season. From March, EVI increased gradually and reached the highest value during the period from June to July. The EVI was in an increase in most areas of the Gurbantunggut Desert, especially in the southern and western marginal zones, the increase trend was low in the hinterland of the desert, and the areas with a decrease of EVI were mainly distributed in the northern part of the desert. The areas with high EVI fluctuation were mainly distributed in the southern and western marginal zones of the Gurbantunggut Desert, the fluctuation of EVI was the most significant in the western marginal zone, and it was low in the hinterland. EVI can used to reflect the change of vegetation coverage in the desert with fixed and semi-fixed dunes, and these results have important reference significance for spatial division of regional desert types.

Key words:  EVI')">

 EVI, spatiotemporal change, empirical orthogonal function (EOF), Gurbantunggut Desert