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Chinese Science Bulletin

, Volume 51, Issue 9, pp 1106–1114 | Cite as

Relationships between tree-ring width index and NDVI of grassland in Delingha

  • He Jicheng 
  • Shao Xuemei 
Article

Abstract

Using five well-replicated Qilian juniper (Sabina przewalskii Kom.) tree-ring width index series, monthly normalized difference vegetation index (NDVI) of grassland, and climatic data from 1982 to 2001, the relationships between tree-ring width index, NDVI of grassland, and climatic data were analyzed firstly. Then, the relationship between tree-ring width index and NDVI of grassland was explored. The results showed that: (1) Temperature and precipitation in June influenced tree-ring width index and NDVI of grassland deeply in Delingha. (2) There were significant relationships between five tree-ring width index series (DLH1-DLH5) and monthly NDVI of grassland from June to September, with the most significant relationship being between tree-ring width index series and NDVI of grassland in August. (3) The PC1 (the first principal component derived from DLH1-DLH5 series) exhibited good agreement with monthly NDVI of grassland in the grass growth season (from June to September) and the averaged NDVI in the growth season, which was attributed to their common responses to water-supply limit in Delingha. This study may allow an increase in studying the past dynamics of grassland in Delingha in that the variation of grassland NDVI during the last millennium has been reconstructed from PC1.

Keywords

Delingha tree-ring width index grassland NDVI 

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Copyright information

© Science in China Press 2006

Authors and Affiliations

  1. 1.Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  2. 2.Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina
  3. 3.Graduate School of Chinese Academy of SciencesBeijingChina

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