Spectral Response Characteristics of Rice Canopy Under Drought Stress at Jointing Stage and Heading Stage

doi:10.3969/j.issn.1000-6362.2014.05.017

Abstract

Abstract: The canopy spectral reflectance of rice at jointing and heading stage under drought treatment and control （normal processing） was measured by using ASD （Field Spec Pro FR2500） spectral radiometer， the spectral variation of rice canopy， vegetation index， water index， derivative spectral characteristics were analyzed under drought stress. The results showed that the visible and near infrared reflectance were，under drought stress，significantly decreased than that of CK at jointing and heading stage， and short infrared reflectance was significantly increased than that of CK，which resulted in all of red edge position of derivative spectra went shortwave direction. Meanwhile，red edge and red edge slope decreased significantly，the composite constructed index of six vegetation index or water index decreased， with the four band moisture index （SRND）and normalized difference infrared index （NDVII） decreased obviously. The visible and near infrared reflectance rate decreased significantly and short infrared band reflectance rate increased significantly after 20d of jointing and 10d of heading under drought stress. During this period， the red edge characteristic parameters， vegetation moisture index decreased slightly. These results could provide technical for the application of hyper spectral remote sensing technology to monitor the rice drought rapidly and nondestructive．

Key words: Drought stress to rice, Spectral characteristics, Red edge feature, Veg

Sayran WALEY，GE Dao kuo， CAO Hong xin，ZHANG Jia hua， LI Bing bai. Spectral Response Characteristics of Rice Canopy Under Drought Stress at Jointing Stage and Heading Stage[J]. Chinese Journal of Agrometeorology, 2014, 35(05): 586-592.

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