Remote sensing of biomass and yield of winter wheat under different nitrogen supplies

被引:300
作者
Serrano, L [1 ]
Filella, I [1 ]
Peñuelas, J [1 ]
机构
[1] Univ Autonoma Barcelona, Fac Ciencies, Ctr Recerca Ecol & Aplicac Forestals, E-08193 Barcelona, Spain
关键词
D O I
10.2135/cropsci2000.403723x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Vegetation indices derived from reflectance data are related to canopy variables such as aboveground biomass, leaf area index (LAY), and the fraction of intercepted photosynthetically active radiation (fIPAR). However, under N stress the relationships between vegetation indices (VI) and these canopy variables might be confounded due to plant chlorosis. We studied the relationships between reflectance-based VI and canopy variables (aboveground biomass, LAP canopy chlorophyll A content [LAI X Chi A], and fIPAR) for a wheat (Triticum aestivum L.) crop growing under different N supplies. Nitrogen fertilization promoted significant increases in radiation interception (plant growth) and, to a lesser extent, in radiation use efficiency (RUE). The VI vs. LAI relationships varied significantly among treatments, rendering the VP-based equations unreliable to estimate LAP under contrasting N conditions. However, a single relationship emerged when LAI X Chi A was considered. Moreover, VP were robust indicators of fIPAR by green canopy components independently of N treatment and phenology. Aboveground biomass was poorly correlated with gain yield, whereas cumulative VP simple radio (SR) was a good predictor of grain yield, probably because cumulative SR closely tracked the duration and intensity of the canopy photosynthetic capacity.
引用
收藏
页码:723 / 731
页数:9
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