Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance

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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
刊名	CROP & PASTURE SCIENCE
	2011
卷号	6 期号:3 页码:208-217
关键词	WATER-USE EFFICIENCY REMOTELY-SENSED DATA NORTH CHINA PLAIN LEAF-AREA INDEX SIMPLE-MODEL SOLAR-RADIATION CROP PRODUCTION GRAIN-YIELD SATELLITE RICE
通讯作者	Luo Yi
合作状况	其它
英文摘要	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 (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.
收录类别	SCI
资助信息	Chinese Academy of Sciences KZXC2-YW-BR-12;Ministry of Science and Technology, China 2010CB951002
语种	英语
公开日期	2011-04-27
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/2312]
专题	地理科学与资源研究所_研究生部
推荐引用方式 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.