期刊
JOURNAL OF PLANT RESEARCH
卷 122, 期 3, 页码 317-326出版社
SPRINGER JAPAN KK
DOI: 10.1007/s10265-009-0215-y
关键词
Equivalent water thickness; Normalized difference water index; Vegetation water content
资金
- China's Special Funds for Major State Basic Research Project [2007CB714406]
- Chinese Academy of Sciences [KZCX2-YW-313]
- State Key Laboratory of Remote Sensing Science [KQ060006]
Vegetation water content (VWC) is an important variable for both agriculture and forest fire management. Remote sensing technology offers an instantaneous and non-destructive method for VWC assessment provided we can relate in situ measurements of VWC to spectral reflectance in a reliable way. In this paper, based on radiative transfer models, three new normalized difference water indices (NDWI) are proposed for VWC [fuel moisture content (FMC), and equivalent water thickness (EWT)] estimation, taking both leaf internal structure and dry matter content into account. Reflectance at 1,200, 1,450 and 1,940 nm were selected and normalized with reflectance at 860 nm to establish three water indices, NDWI1200, NDWI1450 and NDWI1940. Good correlations were observed between FMC (R (2) = 0.65-0.80) and EWT (both at the leaf scale, R (2) = 0.75-0.81 for EWTL and at the canopy scale, R (2) = 0.80-0.83 for EWTC) at various stages of wheat crop development.
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