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Journal of Arid Land  2012, Vol. 4 Issue (3): 310-319    DOI: 10.3724/SP.J.1227.2012.00310
Research Articles     
Measuring cotton water status using water-related vegetation indices at leaf and canopy levels
QiuXiang YI, AnMing BAO, Yi LUO, Jin ZHAO
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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Abstract  Drought is one of the major environmental threats in the world. In recent years, the damage from droughts to the environment and economies of some countries has been extensive, and drought monitoring has caused widespread concerns. Remote sensing has a proven ability to provide spatial and temporal measurements of surface properties, and it offers an opportunity for the quantitative assessment of drought indicators such as the vegetation water content at different levels. In this study, sites of cotton field in Shihezi, Xinjiang, Northwest China were sampled. Four classical water content parameters, namely the leaf equivalent water thickness (EWTleaf), the fuel moisture content (FMC), the canopy equivalent water thickness (EWTcanopy) and vegetation water content (VWC) were evaluated against seven widely-used water-related vegetation indices, namely the NDII (normalized difference infrared index), NDWI2130 (normalized difference water index), NDVI (normalized difference vegetation index), MSI (moisture stress index), SRWI (simple ratio water index), NDWI1240 (normalized difference water index) and WI (water index), respectively. The results proved that the relationships between the water-related vegetation indices and EWTleaf were much better than that with FMC, and the relationships between vegetation indices and EWTcanopy were better than that with VWC. Furthermore, comparing the significance of all seven water-related vegetation indices, WI and NDII proved to be the best candidates for EWT detecting at leaf and canopy levels, with R2 of 0.262 and 0.306 for EWTleaf-WI and EWTcanopy-NDII linear models, respectively. Besides, the prediction power of linear regression technique (LR) and artificial neural network (ANN) were compared using calibration and validation dataset, respectively. The results indicated that the performance of ANN as a predictive tool for water status measuring was as good as LR. The study should further our understanding of the relationships between water-related vegetation indices and water parameters.

Key wordsannuals      semi-shrubs      Artemisia species      germination      chilling and dry storage      light      temperature      sand burial     
Received: 12 October 2011      Published: 03 September 2012

West Light Foundation of Chinese Academy of Sciences (XBBS200902), the Knowledge Innovation Project of Chinese Academy of Sciences (KZCX2-YW-BR-12), the National Natural Science Foundation of China (41104130), the West Light Foundation of Chinese Academy of Sciences (XBBS201006), and the China Postdoctoral Science Foundation (20100471681).

Corresponding Authors: QiuXiang YI     E-mail:
Cite this article:

QiuXiang YI, AnMing BAO, Yi LUO, Jin ZHAO. Measuring cotton water status using water-related vegetation indices at leaf and canopy levels. Journal of Arid Land, 2012, 4(3): 310-319.

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