4th Oct.

Recently, I read 2 papers which are closely related to SiF. Because after reading Prof.'s literature review, I found my literature review is too careless. I should collect information I need for my paper day by day. So I decided to read papers and take notes more carefully.

Xi Yang (GRL, 2015) investigated

Correlated relationship between SiF and GPP
Correlated relationship between SiF and APAR
SiF yield(SiF/APAR) positively correlated with LUE (besides, cloudy relationship is stronger than sunny day)
Consistency between weekly tower-based SiF and satellite SiF

Differences: their system is upward irradiance (with a cosine corrector) and downward radiance; using spectral fitting method to compute SiF value;

Lessons: SiF-GPP relationship is biome specific; daily LUE calculation method should be noticed; PRI could be used to analyze pigment concentration; “We expected that when NPQ is absent or small, SIFyield and LUE could be negatively correlated”;

Information: Red peak is mainly contributed by Photosystem II activity, while far-red peak is the combination of both Photosystem I and II (PSI and PSII).

Pradeep Wagle, 2016. Comparison of solar-induced chlorophyll fluorescence, light-use efficiency, and process-based GPP models in maize.

1. They compared relationship between SIF, EVI and LSWI with tower GPP data;

2. They compared GPP estimates of SCOPE, VPM and SIF models with tower GPP data, and Pearson's correlation coefficients (r) are 0.97, 0.94, and 0.93 for the SCOPE, VPM, and SIF models, respectively.

Information: LUE is generally tabulated with invariant values associated to plant functional types, then attenuated by temperature and water stressors under limiting environmental conditions; FPAR is commonly approximated from remotely sensed vegetation indices; what’s the difference between APARcanopy and APARchl;

lessons: Space-borne SIF observations can be used to retrieve the seasonal variability of Vcmax for maize and soybean