NDVI,spatiotemporal variation,climatic factor,northern slope of the Tianshan Mountains ,"/> <p class="MsoNormal"> <b>Spatiotemporal Variation of Vegetation NDVI and Its Relationship with Climatic Factors on the Northern Slope of the Tianshan Mountains</b>

Arid Zone Research ›› 2019, Vol. 36 ›› Issue (5): 1250-1260.doi: 10.13866/j.azr.2019.05.23

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Spatiotemporal Variation of Vegetation NDVI and Its Relationship with Climatic Factors on the Northern Slope of the Tianshan Mountains

Nijiati Yimier, Mansur Shabiti, Yusufu Maimaiti   

  1. College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, Xinjiang,China
  • Received:2018-12-07 Revised:2019-05-29 Online:2019-09-15 Published:2019-09-11

Abstract:

In this paper, the monadic regressive analysis was employed to investigate the annual and monthly as well as spatial variations of vegetation NDVI on the northern slope of the Tianshan Mountains from 2000 to 2015 based on the MODIS NDVI data and the corresponding climate data. The results are as follows:   In recent 16 years, the average annual NDVI on the northern slope of the Tianshan Mountains fluctuated between 0.27 and 0.31 and in a significant increase trend. The average monthly NDVI value began to increase rapidly in April, reached its maximum in July, and then began to decrease in August. The curve of average monthly NDVI was unimodal. The increase of vegetation index on the northern slope of the Tianshan Mountains was different from different seasons. Spatially, the vegetation coverage was high in the west and south but low in the east and north. There was a significant spatial difference of average annual vegetation NDVI and NDVI in growing season, and the vegetation coverage was increased in the central area but decreased in the northeast, west and south;   The average temperature and precipitation on the northern slope of the Tianshan Mountains in the past years were gradually increased and in an increase-decrease-increase fluctuation trend. Spatially, the temperature was low but the precipitation was high in the southern mountainous region, the situation in the northern plain, however, was opposite;   There was a certain correlation between the vegetation NDVI and the temperature and precipitation, especially in growing season. The vegetation NDVI in spring was more closely related to the temperature, but in summer was more closely related to the precipitation. Comprehensively, and the effect of precipitation on the vegetation coverage was higher than that of temperature;    There was a hysteresis of vegetation NDVI than the temperature and precipitation in growing season from May to September.

Key words: NDVI')">

NDVI, spatiotemporal variation, climatic factor, northern slope of the Tianshan Mountains