气候变化研究进展2017，Vol.13Issue(5)：473-482,10.DOI:10.12006/j.issn.1673-1719.2016.242
1982—2012年北半球荒漠草原过渡带植被物候特征及其与气候因子的关系
Characteristics of Phenology Changes and Its Relationship with Climatic Factors in Desert/Grassland Biome Transition Zone of Northern Hemisphere During 1982-2012
摘要
Abstract
The annual vegetation phenology in the desert/grassland biome transition zone of Northern Hemisphere was deduced from the GIMMS NDVI 3g dataset and the spatio-temporal changes of phenology during 1982-2012 were studied. At the same time, the climatic driving factors of phenology change were also analyzed by coupling global meteorological reanalysis data. The results show that the vegetation phenology in each desert/grassland biome transition zone during 1982-1997 had different characteristics. However, the regular phenomenon of vegetation phenology changed after 1998. The end of growth season (EOS) in almost all desert/grassland biome transition zones of Northern Hemisphere became earlier during 1998-2012, which the rate is 0.41 d/a. The length of growth season (LOS) shortened in each region except for the Sahel, which the average shorten rate is 0.88 d/a. The correlation analysis between vegetation phenology and climatic factors show that the phenology of desert/grassland biome transition zone is affected by climate significantly and the main driving factors are different in each region. In the middle and high latitudes, the temperature is the key factor to limit the vegetation activity and the temperature rising can promote the start of growth season earlier. However, the precipitation increasing could weaken the growth of vegetation in these regions. In contrast, the water deficit that caused by the high temperature could shorten the vegetation growing season, and that is the key impact factor in the low latitudes of Northern Hemisphere. Finally, the relationship between phenology and climatic factors in different time-lags were also analyzed. The results show that the phenology change of desert/grassland biome transition zone is responded obviously to temperature change. In addition, there has a time lag effect in the response of phenology change to evapotranspiration. Nevertheless, this rule does not exist between phenology change and precipitation.关键词
物候/气候变化/荒漠草原过渡带/GIMMSNDVI3g数据Key words
phenology/climate change/desert/grassland biome transition zone/GIMMS NDVI 3g dataset引用本文复制引用
候静,杜灵通,刘可,朱玉果,胡悦,杨新国,张学俭..1982—2012年北半球荒漠草原过渡带植被物候特征及其与气候因子的关系[J].气候变化研究进展,2017,13(5):473-482,10.基金项目
国家自然科学基金(41661003) （41661003）
宁夏自然科学基金项目(NZ16010) （NZ16010）
宁夏大学研究生创新项目(GIP2015041) （GIP2015041）
