JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2015, Vol. 32 ›› Issue (3): 95-98,111.DOI: 10.3969/j.issn.1001-5485.2015.03.019

• NONPOINT SOURCE POLLUTION AND ECOLOGICAL ENVIRONMENT • Previous Articles     Next Articles

Spectral Characteristic of Winter Wheat with Different Water and Nitrogen Conditions

YAO Fu-qi1,2,CAI Huan-jie2,SUN Jin-wei3,QIAO Wei1   

  1. 1.Agricultural Water Conservancy Department, Yangtze River Scientific Research Institute,Wuhan 430012, China;
    2. Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas under Ministry of Education, Northwest A & F University, Yangling 712100, China;
    3. Soil and Water Conservation Department, Yangtze River Scientific Research Institute, Wuhan 430012, China
  • Received:2014-12-30 Online:2015-03-01 Published:2015-03-06

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Abstract: By field experiments, the hyperspectral reflectance of winter wheat canopy with different moisture and nitrogen conditions during growth periods of 2010 and 2011 was measured by portable field spectrometer ASD. The canopy spectral characteristic in the presence of different leaf area index(LAI) , different chlorophyll content(SPAD value) and different water and nitrogen stress was analyzed. Results showed that peak of reflectance (green) and valley of adsorption (red) became more obvious with the increase of LAI and SPAD. The hyperspectral reflectance of winter wheat canopy was different in the presence of different water and nitrogen stresses. In the visible light band, the reflectivity increased with the decrease of nitrogen, but reduced in the near-infrared band.The research result could be a scientific support for winter wheat growth detection and water-saving irrigation.

Key words: winter wheat, spectral characteristic, water and nitrogen stress, leaf area index, chlorophyll content

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