Temporal and Spatial Variations in NDVI and Analysis of the Driving Factors in the Desertified Areas of Northern China From 1998 to 2015

• DOI: 10.3389/fenvs.2021.633020
• Publication Date: 2021-02-22T05:44:42Z
• Authors: Xuyang Wang; Yuqiang Li; XinYuan Wang; Yulin Li; Jie Lian; Xiangwen Gong
• Keywords: Desertification; Sand dune stabilization; Restoration Ecology

China faces some of the most serious desertification in world, leading to many problems. To solve them, large-scale ecological restoration projects were implemented. assess their effectiveness, we analyzed normalized-difference vegetation index (NDVI) data derived from SPOT VEGETATION and gridded climate datasets 1998 2015 detect degrees effects human drivers on dynamics. We found that NDVI desertified areas generally decreased before 2000, then increased. The annual increase was fixed dunes (0.0013) = semi-fixed > semi-mobile (0.0012) gobi (gravel) desert (0.0011) mobile (0.0003) saline–alkali land (0.0000). proportions area each type which increased (43.4%) (39.7%) (26.7%) (23.1%) (14.4%) (12.5%). Thus, response efforts as initial dune stability proportion where dominated by temperature (1.8%) far less than precipitation (14.1%). However, 67.6% change driven non-climatic factors. effectiveness significant Loess Plateau Mu Us, Horqin, Hulunbuir sandy lands. In contrast, there little effect Badain Jaran, Ulan Buh, Tengger deserts; particular, cover has declined seriously Hunshandake Sandy Land Alkin Desert Grassland. more or different must be implemented these areas.