研究目的
To determine the optimal measurement point at the leaf scale for sun-induced chlorophyll fluorescence (SIF) and the best fluorescence yield indices (FY indices) extracted from SIF for leaf nitrogen content (LNC) detection.
研究成果
The study concluded that the 1/3 distance from the leaf base is the optimal position for measuring SIF at the leaf level, and the downward FY indices, especially the ratio peak FY687/FY739, are the best for monitoring LNC. SIF can be a potential method for monitoring LNC of winter wheat with higher efficiency.
研究不足
The study is limited to the leaf scale and specific conditions of winter wheat, and the findings may not be directly applicable to other scales or plant species without further research.
1：Experimental Design and Method Selection:
The study conducted an experiment to determine the optimal measurement point at the leaf scale for SIF and the best FY indices for LNC detection.
2：Sample Selection and Data Sources:
Two data sets were collected from two wheat field experiments with different nitrogen application rates and wheat cultivars.
3：List of Experimental Equipment and Materials:
An ASD FieldSpec Pro FR2500 spectrometer coupled with the FluoWat leaf clip was used for SIF measurements.
4：Experimental Procedures and Operational Workflow:
SIF measurements were taken at different distances from the leaf base under natural illumination.
5：Data Analysis Methods:
The predictive performance of FY indices to LNC was evaluated using statistical parameters like the coefficient of determination (R2), root mean square error (RMSE), and relative root mean square error (RRMSE).
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