Synchronous Changes of GPP and Solar-Induced Chlorophyll Fluorescence in a Subtropical Evergreen Coniferous Forest.

From the general diurnal variation from January to August, both SIF and GPP showed a trend of increasing first and then decreasing ( Figure 1 d).

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Therefore, the accurate understanding and rapid detection of the changes in plantation productivity are highly significant for the assessment of regional carbon sink.

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While SIF will maintain an increasing trend, meaning that SIF-GPP presents a nonlinear relationship on the daily scale [ 14 , 15 , 16 ].

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