Sun, GQ; Guo, B; Zang, WQ; Huang, XZ; Han, BM; Yang, X; Chen, ST; Weia, CX; Wu, HW (2020). Spatial-temporal change patterns of vegetation coverage in China and its driving mechanisms over the past 20 years based on the concept of geographic division. GEOMATICS NATURAL HAZARDS & RISK, 11(1), 2263-2281.

Based on the datasets of MODIS NDVI and SPOT VETGETATION NDVI from 1999 to 2018, this study has introduced the gravity centre model and time-lag analysis model to explore the spatial-temporal change patterns of the NDVI in China in different sub-regions and its response to climate factors. Results showed that: (1) In 1999-2018, there was an increasing trend in vegetation coverage in China on the whole, with a larger increase occurring in central south and northeast China. (2) The NDVIs of six land use types showed a similar change trend with temperature and precipitation with different time lags. (3) The maximum correlation coefficients between the NDVIs of different land types and climate factors appeared at Lag 0-1 (current month and previous one month) and Lag 0-2 (current month, previous one and two month), while the correlation coefficients were the lowest at Lag 3 (previous three month). (4) During the past twenty years, the gravity centres of the NDVI, temperature and precipitation moved northward as a whole with similar migration trajectories. These results could provide important decision supports for vegetation restorations and ecological protections in different sub-regions of China.