Journal of Ecology and Rural Environment ›› 2020, Vol. 36 ›› Issue (7): 870-878.doi: 10.19741/j.issn.1673-4831.2019.0488

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Analysis on the Characteristics of Spatial and Temporal Changes for Land Desertification in Hotan Area, Xinjiang.

NUERMAIMAITI·Ruzi1, WANG Xue-mei1,2   

  1. 1. College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
    2. Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, Urumqi 830054, China
  • Received:2019-06-28 Online:2020-07-25 Published:2020-07-18

Abstract: The temporal and spatial evolution process of land desertification in Hotan area of Xinjiang was studied with the aim of land desertification control and ecological environment restoration in arid area. Using MODIS 13Q1-NDVI remote sensing data of Hotan area based on RS and GIS technology and taking vegetation coverage as the evaluation index of desertification at different levels, the characteristics in spatial and temporal changes of land desertification in Hotan area from 2000 to 2018 were analyzed. The results show that:(1) the areas with decreasing trend for vegetation coverage accounted for 0.38% of the total study area, of which the area with extremely significant reduction with vegetation coverage accounted for 0.10% of the total area; and the area with significant reduction with vegetation coverage accounted for 0.28% of the total area; the area with increasing vegetation coverage accounted for 12.88% of the total area, of which the area with extremely significant growth with vegetation coverage accounted for only 1.10%, and the area with significant growth with vegetation coverage was accounted for 11.78% of the total study area. (2) The area of severe desertification showed a decreasing trend from 2006 to 2012 and then an increasing trend from 2012 to 2018, with an average annual increasing rate of 0.59%, while the area of moderate desertification showed a decreasing trend with an average annual decreasing rate of 1.43%, while the area of mild desertification and non-desertification maintained an increasing trend with an average annual increasing rate of 2.19% and 3.70%, respectively. (3) According to the area transfer matrix, in the past 20 years, the area of unchanged land types in the study area is 19.841×104 km2, the least transfer area was non-desertification area, and the transfer area of moderate desertification area was relatively larger. Due to the influence of air temperature, precipitation and human activities and other factors, the area of severe desertification in Hotan area has increased slightly in recent 20 years, while the areas of slight desertification and non-desertification have been increased significantly.

Key words: vegetation coverage, desertification, spatial and temporal change, MODIS13Q1-NDVI data, Hotan area

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