Mots-clés
Années 1998-2007 ; Bassin-versant ; Changement climatique ; Chine ; Dynamique de la végétation ; Espace-temps ; Indice de végétation ; Montagne ; Pergélisol ; Plateau ; Précipitation ; Qinghai ; SPOT ; Température ; Température de l'air ; Température du sol ; Tibet ; TélédétectionAir temperature ; China ; Climatic change ; Mountain ; Permafrost ; Plateau ; Precipitation ; Qinghai ; Remote sensing ; SPOT ; Soil temperature ; Space time ; Temperature ; Tibet ; Vegetation dynamics ; Vegetation index ; WatershedCambio climático ; China ; Cuenca hidrográfica ; Dinámica de la vegetación ; Espacio-tiempo ; Meseta ; Montaña ; Pergelisol ; Precipitación ; SPOT ; Teledetección ; Temperatura ; Temperatura del aire ; Temperatura del suelo ; Tibet ; Tsinghai ; Índice de vegetaciónSpatio-temporal changes of NDVI and its relation with climatic variables in the source regions of the Yangtze and Yellow rivers
Auteur(s) et Affiliation(s)
YANG, Z.
Nanjing Inst. of Environmental Sciences, Ministry of Environmental Protection, Nanjing, Chine
GAO, J.
Nanjing Inst. of Environmental Sciences, Ministry of Environmental Protection, Nanjing, Chine
ZHOU, C.
Inst. of Geographic Sciences and Natural Resources Research, Beijing, Chine
SHI, P.
Inst. of Geographic Sciences and Natural Resources Research, Beijing, Chine
ZHAO, L.
Observation and Research Station of Qinghai-Tibet Plateau, CAREERI, CAS, Lanzhou, Chine
SHEN, W.
Nanjing Inst. of Environmental Sciences, Ministry of Environmental Protection, Nanjing, Chine
OUYANG, H.
Inst. of Geographic Sciences and Natural Resources Research, Beijing, Chine
Description :
The spatial distribution and dynamic change of vegetation cover in the source regions of the Yangtze and Yellow rivers are analyzed in recent 10 years based on 1-km resolution multi-temporal SPOTVGT-DN data from 1998 to 2007. Meanwhile, the correlation relationships between air temperature, precipitation, shallow ground temperature and NDVI, which is 3×3 pixel at the center of Wudaoliang, Tuotuohe, Qumalai, Maduo, and Dari meteorological stations were analyzed. The results show that the NDVI values in these 2 source regions are increasing in recent 10 years. Spatial distribution of NDVI which was consistent with hydrothermal condition decreased from southeast to northwest of the source regions. Shallow ground temperature had the greatest effect on NDVI change, and the second greatest factor influencing NDVI was average temperature. The correlation between NDVI and shallow ground temperature in the source regions of the Yangtze and Yellow rivers increased significantly with the depth of soil layer.
Type de document :
Article de périodique
Source :
Journal of geographical sciences. Acta geographica sinica, issn : 1009-637X, 2011, vol. 21, n°. 6, p. 979-993, nombre de pages : 15, Références bibliographiques : 2 p.
Date :
2011
Editeur :
Pays édition : Chine
Langue :
Anglais
Anglais
Droits :
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Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)