PROGRESS IN GEOGRAPHY ›› 2008, Vol. 27 ›› Issue (6): 32-40.doi: 10.11820/dlkxjz.2008.06.005

• Original Articles • Previous Articles     Next Articles

Changes of Chinese Beginning Date of Vegetation Greenness Period Based on NOAA NDVI

WU Yongfeng1,2, LI Maosong1,2, LIU Buchun1,2, BAI Wenbo1,2, JIANG Weiguo3   

  1. 1. Institute of Environment and Sustainable Development for Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China;
    2. Key Laboratory of Agro-Environment &|Climate Change, Ministry of Agriculture, Beijing 100081, China;
    3. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
  • Received:2008-04-01 Revised:2008-09-01 Online:2008-11-25 Published:2008-11-25

Abstract:

Beginning date of greenness period of vegetation (BGP) is closely related to seasonal dynamics of the lower atmosphere and is therefore an important variable in influences and feedback mechanisms of global climate variation to terrestrial ecosystem. Detecting BGP using remotely sensed data at regional or global scales has become an advanced topic in geography and ecology. Based on the processed NOAA/AVHRR NDVI data, the study is to use Logistic fitting model on cumulative frequency of NDVI to compute BGP of China by pixels from 1982 to 1999, count the annual average BGP of every vegetation type and bio-climate district, and analyze the interannual change trends, spatio-temporal dynamic change feature of BGP of various spatial types. The results indicate that: (1) BGP have an advance trend in most regions and obviously advance in North China Plain, northeast Guizhou, the middle and south Hunan, west Guangxi and typical grassland area of east Inner Mongolia. (2) The regions in which inter-annual fluctuation of BGP are over 10 days are mainly distributed in the area covered with agricultural vegetation types, the areas covered with evergreen vegetation types and the areas covered with steppe vegetation types. Thereinto, the fluctuation of BGP in Hetao plain, Guanzhong basin, east Henan, west Sichuan basin, Guangdong, Taiwan and so on, are over 15 days. (3) BGPs of the other vegetation types except temperate desert show an advance trends. (4) With the reduction of annual accumulative temperature and increase of drought indices, BGP of various bio-climate areas delay. An advance of BGP is found in South China, East China, Central China, North China, Inner Mongolia, Northeast China and Tibet, whereas a delay occurred in Shaanxi, Shanxi and Northwest China. (5) BGP of all vegetation types evidently delay in 1982, 1983 or 1984, which may be associated with the strong EI-Nino effect in the 1982-1983 period.

Key words: beginning date of vegetation greenness period, bio-climate area, China, NDVI, vegetation type