Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance
H. L. Li A , Y. Luo A B C and J. H. Ma A
+ Author Affiliations
- Author Affiliations
A The Key Laboratory of Ecological Network Observation and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Datun Road, Anwai, Chaoyang District, Beijing 100101, China.
B Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
C Corresponding author. Email: luoyi.cas@hotmail.com
Crop and Pasture Science 62(3) 208-217 https://doi.org/10.1071/CP10315
Submitted: 27 September 2010 Accepted: 18 February 2011 Published: 17 March 2011
Abstract
Radiation-use efficiency (RUE, g/MJ) and the harvest index (HI, unitless) are two helpful characteristics in interpreting crop response to environmental and climatic changes. They are also increasingly important for accurate crop yield simulation, but they are affected by various environmental factors. In this study, the RUE and HI of winter wheat and their relationships to canopy spectral reflectance were investigated based on the massive field measurements of five nitrogen (N) treatments. Crop production can be separated into light interception and RUE. The results indicated that during a long period of slow growth from emergence to regreening, the effect of N on crop production mainly showed up in an increased light interception by the canopy. During the period of rapid growth from regreening to maturity, it was present in both light interception and RUE. The temporal variations of RUEAPAR (aboveground biomass produced per unit of photosynthetically active radiation absorbed by the canopy) during the period from regreening to maturity had different patterns corresponding to the N deficiency, N adequacy and N-excess conditions. Moreover, significant relationships were found between the RUEAPAR and the accumulative normalised difference vegetation index (NDVI) in the integrated season (R2 = 0.68), between the HI and the accumulative NDVI after anthesis (R2 = 0.89), and between the RUEgrain (ratio of grain yield to the total amount of photosynthetically active radiation absorbed by the canopy) and the accumulative NDVI of the whole season (R2 = 0.89) and that after anthesis (R2 = 0.94). It suggested that canopy spectral reflectance has the potential to reveal the spatial information of the RUEAPAR, HI and RUEgrain. It is hoped that this information will be useful in improving the accuracy of crop yield simulation in large areas.
Additional keywords: canopy spectral reflectance, harvest index, nitrogen, radiation-use efficiency, winter wheat.
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