FRI analysis of fluorescence spectra at each sampling site during the non-water transfer period (NWT).

FRI analysis of fluorescence spectra at each sampling site during the non-water transfer period (NWT).</p

Fig 2 -

Percentage of fluorescent components at each sampling point (a is the proportion of each component, b is the proportion of easily degradable protein-like components (C1+C3) and humic-like substances (C2+C4)).</p

FRI analysis of fluorescence spectra at each sampling site during the water transfer period (WT).

FRI analysis of fluorescence spectra at each sampling site during the water transfer period (WT).</p

Geographic coordinates of sampling points for each functional area (reservoir areas (1, 2), residential areas (3, 4), and excursion areas (5, 6, 7)).

Geographic coordinates of sampling points for each functional area (reservoir areas (1, 2), residential areas (3, 4), and excursion areas (5, 6, 7)).</p

Correlation analysis between DOM and spectral index.

(*, p≤0.05, significant difference; **, p≤0.01, highly significant difference. The more linear the ellipse, the closer the correlation index is to one).</p

Regression analysis of DOM and environmental factors.

Regression analysis of DOM and environmental factors.</p

PARAFAC analysis of fluorescence spectra of components of NDR.

PARAFAC analysis of fluorescence spectra of components of NDR.</p

Fig 1 -

WT and NWT water quality characteristics (a) and evaluation (b) of NDR. (Pi: The single factor index; PT: The comprehensive index; codes are period (W/N) + site number (1–7)).</p

RDA analysis of DOM and environmental factors.

(The breen for explanatory variables, black for response variables, blue squares for WT sampling points, and red dots for NWT sampling points).</p

The comprehensive index evaluation by removing the TN factor.

The comprehensive index evaluation by removing the TN factor.</p