北京市农林科学院机构知识库

Assessing the ratio of leaf carbon to nitrogen in winter wheat and spring barley based on hyperspectral data

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文献类型：外文期刊

作者： Xu, Xin-gang ¹ ; Gu, Xiao-he ¹ ; Song, Xiao-yu ¹ ; Xu, Bo ¹ ; Yu, Hai-yang ¹ ; Yang, Gui-jun ¹ ; Feng, Hai-kuan ¹ ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, POB 2449-26, Beijing 100097, Peoples R China

关键词： leaf C/N;spectral index;winter wheat;spring barley;branch-and-bound method

期刊名称：REMOTE SENSING FOR AGRICULTURE, ECOSYSTEMS, AND HYDROLOGY XVIII

ISSN： 0277-786X

年卷期： 2016 年 9998 卷

页码：

收录情况： SCI

摘要： The metabolic status of carbon (C) and nitrogen (N) as two essential elements of crop plants has significant influence on the ultimate formation of yield and quality in crop production. The ratio of carbon to nitrogen (C/N) from crop leaves, defined as ratio of LCC (leaf carbon concentration) to LNC (leaf nitrogen concentration), is an important index that can be used to diagnose the balance between carbon and nitrogen, nutrient status, growth vigor and disease resistance in crop plants. Thus, it is very significant for effectively evaluating crop growth in field to monitor changes of leaf C/N quickly and accurately. In this study, some typical indices aimed at N estimation and chlorophyll evaluation were tested to assess leaf C/N in winter wheat and spring barley. The multi-temporal hyperspectral measurements from the flag-leaf, anthesis, filling, and milk-ripe stages were used to extract these selected spectral indices to estimate leaf C/N in wheat and barley. The analyses showed that some tested indices such as MTCI, MCARI/OSAVI2, and R-M had the better performance of assessing C/N for both of crops. Besides, a mathematic algorithm, Branch-and-Bound (BB) method was coupled with the spectral indices to assess leaf C/N in wheat and barley, and yielded the R-2 values of 0.795 for winter wheat, R-2 of 0.727 for spring barley, 0.788 for both crops combined. It demonstrates that using hyperspectral data has a good potential for remote assessment of leaf C/N in crops.

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