Table 11 Spearman correlation between metrics selected for aquatic ecosystem health in 2018.

	MMIF	FBI	RHQI	IWFI
RHQI	0.920^**	−0.888^**	1.00	−0.772^**
Flow velocity and state	0.55	−0.389	0.547	−0.311
Water quantity	0.02	−0.509	0.171	0.221
Quantity of sediment in riverbed	0.21	−0.166	0.129	−0.097
Sediment coverage rate of silt	0.51	−0.629	0.586	−0.225
Riparian type	0.693^*	−0.874^**	0.751^*	−0.499
Erosion degree of riparian	0.740^*	−0.409	0.659^*	−0.838^**
Riparian width	0.304	−0.18	0.403	−0.277
Vegetation coverage	0.761^*	−0.603	0.746^*	−0.683^*
Vegetation structural integrity	0.669^*	−0.844^**	0.877^**	−0.543
Riparian land use pattern	0.913^**	−0.905^**	0.877^**	−0.663^*
IWFI	−0.820^**	0.627^*	−0.772^**	1.00
TP	−0.838^**	0.664^*	−0.790^**	0.988^**
NH₄⁺-N	−0.428	0.273	−0.432	0.648^*
COD	−0.905^**	0.760^*	−0.851^**	0.693^*
BOD₅	−0.624	0.248	−0.541	0.867^**
DO	0.697^*	−0.455	0.62	−0.612

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