Snow effects on alpine vegetation in the Qinghai-Tibetan Plateau  

作　　者：Kun Wang Li Zhang Yubao Qiu Lei Ji Feng Tian Cuizhen Wang Zhiyong Wang 

机构地区：[1]Key Laboratory of Digital Earth Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing,China [2]College of Geomatics,Shandong University of Science and Technology,Shandong,China [3]ASRC InuTeq,Contractor to U.S.Geological Survey EROS Center,Sioux Falls,SD,USA [4]School of Environment Science and Spatial Informatics,China University of Mining and Technology,Jiangsu,China [5]Department of Geography,University of South Carolina,Columbia,SC,USA

出　　处：《International Journal of Digital Earth》2015年第1期58-75,共18页国际数字地球学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant 41271372);the National Basic Research Program of China(973)(Grant No.2009CB723906)。

摘　　要：Understanding the relationships between snow and vegetation is important for interpretation of the responses of alpine ecosystems to climate changes.The Qinghai-Tibetan Plateau is regarded as an ideal area due to its undisturbed features with low population and relatively high snow cover.We 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 greenness.The 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 Plateau.Snow melting date and vegetation green-up date were significantly correlated(p<0.1)in 39.9% of meadow areas(accounting for 26.2% of vegetated areas)and 36.7% of steppe areas(28.1% of vegetated areas).Vegetation growth was influenced by different seasonal snow cover durations(SCDs)in different regions.Generally,the December–February and March–May SCDs played a significantly role in vegetation growth,both positively and negatively,depending on different water source regions.Snow’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 

分 类 号：Q94[生物学—植物学]