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cje ›› 2005, Vol. ›› Issue (2): 123-130.

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Impacts and lags of global warming on vegetation in Beijing for the last 50 years based on remotely sensed data and phonological information

ZHANG Xuexia1, GE Quansheng2, ZHENG Jingyun2   

  1. 1. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;
    2. Institute of Geographic Science and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2003-06-30 Revised:2004-05-08 Online:2005-02-10

Abstract: Global changes focus on the impacts and feedbacks of global warming on terrestrial ecosystem.Based on climate data (temperature,precipitation etc.) of 1951~2000,NOAA/AVHRR NDVI data of 1982~2000 and foliage phenology data of 1951~2002,impacts of short term seasonal and inter-annual climate changes on zonal ecosystem in Beijing were discussed.The results showed that climate changes presented increasing temperature and fluctuant precipitation in the past 50 years in the study area.Annual NDVI peak value and NDVI mean value could reflect preferably climate changes,and the trends of them appeared increased in some degree among oscillations in the past 20 years,which meant a better condition for vegetation growth or longer growing days in the study area.The VP date was earlier 4.5d in 1990s than that in 1980s.The advance of Prunus davidiana flowering phenophase showed that the spring came 9.63d ahead since 1988 in study region.Statistical analyses indicated that land surface temperature in Beijing has more significant relations with NDVI and the flowering phenophase than with precipitation as a whole.Different time scales led to different relations between climate indexes and growing conditions of plants.At the scale of a year,there were closer relations between AT,AP and NDVI; while at the scale of a month,there were closer relations between ET,EP and NDVI.

Key words: Atrazine, Biodegradation, Soil microorganisms, Community structure, ARDRA

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