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Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance
Li Heli; Luo Yi; Ma Junhua
2011
Source PublicationCROP & PASTURE SCIENCE
Volume6Issue:3Pages:208-217
Corresponding AuthorLuo Yi
AbstractRadiation-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 (R-2 = 0.68), between the HI and the accumulative NDVI after anthesis (R-2 = 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 (R-2 = 0.89) and that after anthesis (R-2 = 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.
KeywordWater-use Efficiency Remotely-sensed Data North China Plain Leaf-area Index Simple-model Solar-radiation Crop Production Grain-yield Satellite Rice
Indexed BySCI
Language英语
Funding OrganizationChinese Academy of Sciences KZXC2-YW-BR-12;Ministry of Science and Technology, China 2010CB951002
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/2312
Collection研究生部
Corresponding AuthorLuo Yi
Recommended Citation
GB/T 7714
Li Heli,Luo Yi,Ma Junhua. Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance[J]. CROP & PASTURE SCIENCE,2011,6(3):208-217.
APA Li Heli,Luo Yi,&Ma Junhua.(2011).Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance.CROP & PASTURE SCIENCE,6(3),208-217.
MLA Li Heli,et al."Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance".CROP & PASTURE SCIENCE 6.3(2011):208-217.
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