Temporal and spatial variations of NDVI in Lake Baikal
Terrestrial vegetation is an important component of ecosystem. Quickly and accurately monitoring the status of vegetation growth and evolution has certain reference meaning in the socio-economic constructions and ecological studies. Remote sensing is an effective measure to monitor vegetation at regional and golbal scales. Taking the sensitive area to the golbal climate and environmental change, Lake Baikal and Siberia, the present study aims to explore the response of vegetation to the climate changes. The data of monthly NDVI/MODIS data, with a spatial resolution of 0.05deg from 2003 to 2008 were used in this study.The results showed tha the yearly variations of NDVI were well corresponding to the growth and decling of vegetation and seasonal changes, which showed obvious phenological phenomena. Correlation analysis presented that with increasing in temperature and precipitation. NDVI increased gradually and vegetations grew well. Moreover, the influence of the precipitation on vegetation was slightly lower than that of the temperature. From 2003 to 2008,the change of NDVI showed a gradual upward trend except the low value in 2006.In the growing seasons, NDVI from 2003 to 2008,roughly showed an upward trend; in non-growing seasons, NDVI showed a roughly linear downward trend. The spatial distribution of NDVI in the west Lake Baikal was relatively lower,and highest value appeared in the north, followed by the south and east. Different vegetation types emerged in the different NDVI values. NDVI of the tundra was the lowest, followed by scrub and agricultural land, the NDVI values of the wetlands annd grassland were relatively high, and the NDVI value of forest lands was the maximum.
NDVI temporal and spatial variations:Lake Baikal climate factor
Jiaxin Jin Hong Jiang Yueqi Wang xiuying Zhang Hong Jiang
International Institute for Earth System Science Nanjing University,NJU Nanjing 210093,China International Institute for Earth System Nanjing University,NJU Nanjing 210093,China International Research Center of Spatial Ecology and Ecosystem Ecology Zhejiang Forestry University
国际会议
The 18th International Conference on Geoinformatics(第18届国际地理信息科学与技术大会 Geoinformatics 2010)
北京
英文
242-245
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）