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Monitoring of winter wheat chlorophyll content in irrigated and dry lands of Shanxi Province of China based on hyperspectral remote sensing.

LI Fang-zhou1, FENG Mei-chen1, YANG Wu-de1**, LI Guang-xin1,2, WANG Chao1, SONG Yue-he1, GAO Long-mei1, ZHAGN Kai3   

  1. (1Institute of Dry Farming Engineering, Shanxi Agricultural University, Taigu 030801, Shanxi, China; 2Crop Science Institute, Shanxi Academy of Agricultural Science, Taiyuan 030031, Shanxi, China; 3Soil manure station, Agricultural Bureau of Fenxi, Fenxi 031500, Shanxi, China)
  • Online:2013-12-10 Published:2013-12-10

Abstract: Chlorophyll content is one of the important agronomic parameters affecting winter wheat yield and quality, while the difference in the farmland soil moisture content can obviously affect the winter wheat growth. It is of significance to realize the hyperspectral remote sensing monitoring of winter wheat chlorophyll content both in irrigated and dry lands. This paper analyzed the winter wheat canopy characteristics in irrigated and dry lands of Shanxi, extracted the sensitive bands, and constructed the optimal remote sensing models of chlorophyll content through correlation analysis. The spectral reflectance and the first derivative spectra had the similar variation trend, but their values had greater differences for the irrigated and dry lands. The spectral characteristic bands of the winter wheat canopy in irrigated lands and in dry lands were 624, 780, 958, 1053, and 1082 nm, and 691, 848, 871, 1199, and 1212 nm, respectively, and the prediction models for monitoring the chlorophyll content of winter wheat in the irrigated lands and dry lands had the best effect when constructed by FDMSAVI (1082, 624) and FDMSAVI (1082, 624), with the R2 being 0.8447 and 0.8627, respectively. It was considered that to utilize hyperspectral technology to monitor the chlorophyll content of winter wheat both in irrigated and in dry lands would be feasible, and could provide technical supports for the scientific management and decision-making of wheat field.