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Driving force and changing trends of vegetation phenology in the Loess Plateau of China from 2000 to 2010

Journal of Mountain Science 2016年第5期13卷 844-856页

作者： WANG Hao LIU Guo-hua LI Zong-shan YE Xin WANG Meng GONG Li State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental ScienceChinese Academyof SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Changes in vegetation phenology are key indicators of the response of ecosystems to climate ***,knowledge of growing seasons is essential to predict ecosystem changes,especially for regions with a fragile ecosystem such as the Loess *** this study,based on the normalized difference vegetation index(NDVI) data,we estimated and analyzed the vegetation phenology in the Loess Plateau from 2000 to 2010 for the beginning,length,and end of the growing season,measuring changes in trends and their relationship to climatic *** results show that for 54.84% of the vegetation,the trend was an advancement of the beginning of the growing season(BGS),while for 67.64% the trend was a delay in the end of the growing season(EGS).The length of the growing season(LGS) was extended for 66.28% of the vegetation in the *** the temperature is important for the vegetation to begin the growing season in this region,warmer climate may lead to drought and can become a limiting factor for vegetation *** found that increasedprecipitation benefits the advancement of the BGS in this *** with a delayed EGS indicated that the appropriate temperature and rainfall in autumn or winter enhanced photosynthesis and extended the growth process.A positive correlation with precipitation was found for 76.53% of the areas with an extended LGS,indicating that precipitation is one of the key factors in changes in the vegetation phenology in this water-limited *** plays an important role in determining the phenological activities of the vegetation in arid and semiarid areas,such as the Loess *** extended growing season will significantly influence both the vegetation productivity and the carbon fixation capacity in this region.

关键词： The Loess Plateau Trend analysis Phenology NDVI vegetation green-up date

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Snow effects on alpine vegetation in the Qinghai-Tibetan Plateau

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International Journal of Digital Earth 2015年第1期8卷 58-75页

作者： Kun Wang Li Zhang Yubao Qiu Lei Ji Feng Tian Cuizhen Wang Zhiyong Wang Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina College of Geomatics Shandong University of Science and TechnologyShandongChina ASRC InuTeq Contractor to U.S.Geological Survey EROS CenterSioux FallsSDUSA School of Environment Science and Spatial Informatics China University of Mining and TechnologyJiangsuChina Department of Geography University of South CarolinaColumbiaSCUSA

Understanding the relationships between snow and vegetation is important for interpretation of the responses of alpine ecosystems to climate *** Qinghai-Tibetan Plateau is regarded as an ideal area due to its undisturbed features with low population and relatively high snow *** used 500 m Moderate Resolution Imaging Spectroradiometer(MODIS)datasets during 2001–2010 to examine the snow–vegetation relationships,specifically,(1)the influence of snow melting date on vegetation green-up date and(2)the effects of snow cover duration on vegetation *** results showed that the alpine vegetation responded strongly to snow phenology(i.e.,snow melting date and snow cover duration)over large areas of the Qinghai-Tibetan *** melting date and vegetation green-up date were significantly correlated(pvegetation growth was influenced by different seasonal snow cover durations(SCDs)in different ***,the December–February and March–May SCDs played a significantly role in vegetation growth,both positively and negatively,depending on different water source ***’s positive impact on vegetation was larger than the negative impact.

关键词： phenology snow cover duration snow melting date NDVI vegetation green-up date

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