Arid Zone Research ›› 2023, Vol. 40 ›› Issue (3): 504-516.doi: 10.13866/j.azr.2023.03.16

• Ecology and Environment • Previous Articles    

Remote sensing monitoring of aeolian desertification in Ongniud Banner based on GEE

MA Haowen1,2(),WANG Yongfang1,2,3(),GUO Enliang1,2   

  1. 1. College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, Inner Mongolia, China
    2. Inner Mongolia Key Laboratory of Disaster and Ecological Security on the Mongolian Plateau, Hohhot 010022, Inner Mongolia, China
    3. University Key Laboratory of Climate Change and Regional Response in Mongolian Plateau, Hohhot 010022, Inner Mongolia, China
  • Received:2022-06-09 Revised:2022-08-10 Online:2023-03-15 Published:2023-03-31

Abstract:

In this study, google earth engine (GEE) was used to extract the normalized difference vegetation index (NDVI) and Albedo parameters. The NDVI-Albedo space was constructed to monitor aeolian desertification in Ongniud Banner from 1991 to 2015, and the influence of key driving factors and mechanism of aeolian desertification in Ongniud Banner were analyzed using geographical detectors combined with natural and anthropogenic factors. The following key results were obtained: (1) Aeolian desertification in Ongniud Banner first experienced the development of evolution process, which then was reversed. During the development period from 1991 to 2000, the total area of aeolian desertified land increased by 2130.29 km2, with extremely severe changes in both aeolian and non-aeolian desertified land, which had dynamic attitudes of 9.5 and -4.8, respectively. From 2000 to 2015, the total desertified land area of aeolian decreased by 3364.61 km2, and the extreme severe aeolian and non-aeolian desertification land were the main changes, with dynamic attitudes of -4.2 and 8.3, respectively; (2) The extreme areas of aeolian desertification in the Ongniud Banner were mainly distributed in the central east and the north of Xiliaohe Plain, while the aeolian desertification in most areas of Jibeiliaoxi Mountain in southwest region is relatively light. From the perspective of transfer, the development area of various types of aeolian desertification land was 5333.75 km2, while the reversed area from 1991 to 2000 was 1157.29 km2. Notably, the non-aeolian desertified to moderate aeolian desertified land area was the largest covering 1000.24 km2. From 2000 to 2015, the development area of all types of aeolian desertified land was only 424.65 km2, while the reversed area was 7041.80 km2. The area of moderate desertified land covering 1449.74 km2 was reverted to non-desertified land; (3) From 1991 to 2000, both natural and anthropogenic factors drove the aeolian desertification process in the study area, with terrain and sand source as the main reasons for the formation of spatial distribution pattern of aeolian desertified land in Ongniud Banner. The warm and dry climate conditions, as well as intensified human activities led to the development of aeolian desertification in Ongniud Banner. From 2000 to 2015, aeolian desertification reversal was driven by the implementation of a series of anti-desertification policies and the improvement of natural conditions.

Key words: GEE, aeolian desertification, NDVI-Albedo space, geographical detector, Horqin Sandy Land