Remote sensing of biomass and yield of winter wheat under different nitrogen supplies
Remote sensing of biomass and yield of winter wheat under different nitrogen supplies
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DOI：
10.2135/cropsci2000.403723x
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发表时间：
2000-05-01
期刊：
影响因子：
2.3
通讯作者：
Peñuelas, J
中科院分区：
文献类型：
--
作者：
Serrano, L;Filella, I;Peñuelas, J
反射率数据得出的植被指数与冠层变量有关，例如地上生物量，叶子面积指数（LAI）以及截距光合式有效辐射（FIPAR）的比例。但是，在N压力下，植被指数（VI）之间的关系和这些冠层变量可能由于植物氯化而被混淆。我们研究了基于反射率的VI和冠层变量（地上生物量，乳冠层叶绿素A含量[LAI X CHI A]和FIPAR）与小麦（Triticum Aestivum L.）作物之间的关系。氮肥促进了辐射拦截（植物生长）的显着增加，并且在较小程度上，辐射使用效率（RUE）的程度较小。 VI与LAI的关系在处理之间差异很大，这使得基于VP的方程在对比n条件下无法估算圈速。但是，当考虑到Lai X Chi A时出现了单一的关系。此外，VP是绿色冠层组件的强大指标，独立于n处理和物候。地上生物量与增益产量的相关性很差，而累积VP简单无线电（SR）是晶粒产量的良好预测指标，这可能是因为累积SR密切跟踪了冠层光合作用能力的持续时间和强度。
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.