[10] Myneni R B, Keeling C D, Tucker C J et al. Increased plant growth in the northern high latitudes from 1981 to 1999[D]. Nature, 386, 698-702(1997).

[11] Myneni R B, Tucker C J, Asrar G et al. Interannual variations in satellite-sensed vegetation index data from 1981 to 1991[D]. Journal of Geophysical Research: Atmospheres, 103, 6145-6160(1998).

[24] Beck P S A, Atzberger C, Høgda K A et al. Improved monitoring of vegetation dynamics at very high latitudes: A new method using MODIS NDVI[D]. Remote Sensing of Environment, 100, 321-334(2006).

[25] White M A, Thornton P E, Running S W. A continental phenology model for monitoring vegetation responses to interannual climatic variability[D]. Global Biogeochemical Cycles, 11, 217-234(1997).

[34] Chuai X W, Huang X J, Wang W J et al. NDVI, temperature and precipitation changes and their relationships with different vegetation types during 1998-2007 in Inner Mongolia, China[D]. International Journal of Climatology, 33, 1696-1706(2013).