13 Menzel A. European phenological response to climate change matches the warming pattern. Glob Change Biol, 2006, 12: 1969-1976？？
[6]
14 Parmesan C. Influences of species, latitudes and methodologies on estimates of phenological response to global warming. Glob Change Biol, 2007, 13: 1860-1872？？
2006 in the Qinghai-Xizang Plateau. Agri Forest Meteorol, 2011, 151: 1599-1608
[9]
18 Yu H Y, Luedeling E, Xu J C. Winter and spring warming result in delayed spring phenology on the Tibetan Plateau. Proc Natl Acad Sci USA, 2010, 107: 22151-22156？？
28 Malingreau J R. Global vegetation dynamics: Satellite observations over Asia. Int J Remote Sens, 1986, 7: 1121-1146？？
[15]
30 辛景峰, 宇振荣, Driessen P M. 利用NOAA-NDVI 数据集监测冬小麦生育期的研究. 遥感学报, 2001, 6: 442- 447
[16]
42 Jeong S J, Ho C H, Gim H J, et al. Phenology shifts at start vs. end of growing season in temperate vegetation over the Northern Hemisphere for the period 1982-2008. Glob Change Biol, 2001, 17: 2385-2399
[17]
45 Shen M G. Spring phenology was not consistently related to winter warming on the Tibetan Plateau. Proc Natl Acad Sci USA, 2011, 108:91-92？？
[18]
46 Walther G R, Post E, Convey P, et al. Ecological responses to recent climate change. Nature, 2002, 416: 389-396？？
[19]
48 Fontana F, Rixen C, Jonas T, et al. Alpine grassland phenology as seen in AVHRR, VEGETATION, and MODIS NDVI time series— A comparison with in situ measurements. Sensors, 2008, 4: 2833-2853
[20]
49 Chen H, Zhu Q A, Wu N, et al. Delayed spring phenology on the Tibetan Plateau may also be attributable to other factors than winter and spring warming. Proc Natl Acad Sci USA, 2011, 108: 93？？
[21]
51 Piao S L, Ciais P, Friedlingstein P, et al. Net carbon dioxide losses of northern ecosystems in response to autumn warming. Nature, 2008,451: 49-52？？
4 Van Vliet A J H, de Groot R S, Bellens Y, et al. The European Phenology network. Int J Biometeor, 2003, 47: 202-212？？
[24]
5 White M A, Thornton P E, Running S W. A continental phenology model for monitoring vegetation responses to inter-annual climatic variability. Glob Biogeochem Cycles, 1997, 11: 217-234？？
[25]
6 Chuine I. A unified model for budburst of trees. J Theor Biol, 2000, 207: 337-347？？
17 Piao S L, Cui M D, Chen A P, et al. Altitude and temperature dependence of change in the spring vegetation green-up date from 1982 to
[32]
19 Delbart N, Le Toan T, Kergoat L, et al. Remote sensing of spring phenology in boreal regions: A free of snow-effect method using NOAA- AVHRR and SPOT-VGT data (1982-2004). Remote Sens Environ, 2006, 101: 52-62？？
31 Roerink G J, Menenti M, Verhoef W. Reconstructing cloud free NDVI composites using Fourier analysis of time series. Int J Remote Sens,2000, 21: 1911-1917？？
[39]
32 Shen M G, Tang Y H, Chen J, et al. Influences of temperature and precipitation before the growing season spring phenology in grasslands of the central and eastern Qinghai-Tibetan Plateau. Agri Forest Meteorol, 2011, 151: 1711-1722？？
[40]
33 Lloyd D A. Phenological classification of terrestrial vegetation cover using shortwave vegetation index imagery. Int J Remote Sens, 1990,11: 2269-2279？？
[41]
34 Zhou L M, Tucker C J, Kaufmann R K, et al. Variation in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999. J Geophys Res, 2001, 106: 20069-20083？？
[42]
35 Zhang X Y, Friedl M A, Schaaf C B, et al. Monitoring vegetation phenology using MODIS. Remote Sens Environ, 2003, 84: 471-475？？
[43]
36 Kafaki, S B, Asadollah M, Seyed A H. Monitoring growing season length of deciduous broad leaf forest derived from satellite data in Iran. Am J Environ Sci, 2009, 5: 647-652？？
[44]
37 Piao S L, Fang J Y, Zhou L M, et al. Variations in satellite-derived phenology in China’s temperate vegetation. Glob Change Biol, 2006,12: 672-685？？
[45]
38 St?ckli R, Vidale P L. European plant phenology and climate as seen in a 20-year AVHRR land-surface parameter dataset. Int J Remote Sens, 2004, 25: 3303-3330？？
[46]
39 Kaduk J, Heimann M A. Prognostic phenology scheme for global terrestrial carbon cycle models. Clim Res, 1996, 6: 1-19？？
[47]
40 White M A, de Beurs K M, Didan K, et al. Inter-comparison, interpretation, and assessment of spring phenology in North America estimated from remote sensing for 1982-2006. Glob Change Biol, 2009, 15: 2335-2359
[48]
41 Julien Y, Sobrino J A. Global land surface phenology trends from GIMMS database. Int J Remote Sens, 2009, 30: 3495-3513？？
[49]
43 郑度. 青藏高原自然地域系统研究. 中国科学 D 辑: 地球科学, 1996, 26: 336-341
[50]
44 Zeng H Q, Jia G S, Epstein H. Recent changes in phenology over the northern high latitudes detected from multi-satellite data. Environ Res Lett, 2011, 6, doi: 10.1088/1748-9326/6/4/045508
[51]
47 Tucker C J, Pinzon J E, Brown M E, et al. An extended AVHRR 8 km NDVI data set compatible with MODIS and SPOT vegetation NDVI data. Int J Remote Sens, 2005, 26: 4485-4498？？
[52]
50 Yi S H, Zhou Z Y. Increasing contamination might have delayed spring phenology on the Tibetan Plateau. Proc Natl Acad Sci USA, 2011,108: 94？？
