. Author manuscript; available in PMC: 2017 Apr 5.

Published in final edited form as: Energy Ecol Environ. 2016 Feb 14;1(3):157–182. doi: 10.1007/s40974-016-0006-y

Table 5.

Spearman’s rs correlation coefficient of variables in Couch grass–Buffer grass, Kikuyu grass and Napier grass in the VFS I, II and III, averaged across three replications (A, B and C), August 2013 to December 2014

	Runoff, Q (m³ s⁻¹)	SSC (mg L⁻¹)	Precipitation (mm)	Turbidity, NTU	Total coliform, CFU (mL⁻¹)	Fecal coliform, CFU 100 mL⁻¹	E. coli, CFU 100 mL⁻¹
a. VFS I Couch grass–Buffer grass combination
Runoff, Q (m³ s⁻¹)	0	0.001509^*	0.70226^*	0.3911^*	0.062511^*	0.054842^*	0.42656^*
SSC (mg L⁻¹)	0.80702	0	0.41409^*	0.4086^*	0.30612^*	0.37682^*	0.92617^*
Precipitation (mm)	−0.12346	−0.26018	0	0.819^*	0.99132^*	0.38675^*	0.97378^*
Turbidity, NTU	0.27273	0.26316	−0.07408	0	0.33059^*	0.11818^*	0.41994^*
Total coliform, CFU (mL⁻¹)	0.55245	0.32281	−0.00353	−0.308	0	0.33059^*	0.5995^*
Fecal coliform, CFU 100 mL⁻¹	0.56643	0.2807	−0.27514	0.4755	0.30769	0	0.0085^*
E. coli, CFU 100 mL⁻¹	0.25353	−0.03004	−0.01066	0.2571	0.16902	0.71833	0

b. VFS II effect significantly (p < 0.05) attributed to Kikuyu grass
Runoff, Q (m³ s⁻¹)		0.00023^*	0.15082^*	0.4303^*	0.001635^*	6.83E−05^*	0.000483^*
SSC (mg L⁻¹)	0.84924		0.27066^*	0.44064^*	0.003905^*	0.003151^*	0.00132^*
Precipitation (mm)	0.42207	0.33011		0.33848^*	0.95014^*	0.59259^*	0.8124^*
Turbidity, NTU	0.23967	0.23448	−0.28886		0.35801^*	0.041^*	0.020782^*
Total coliform, CFU 100 mL⁻¹	0.78069	0.73895	0.019284	0.27785		0.006618^*	0.005126^*
Fecal coliform, CFU, 100 mL⁻¹	0.88138	0.75	0.16391	0.57222	0.70937		1.49E−06^*
E. coli, CFU 100 mL⁻¹	0.82735	0.78977	0.073104	0.63086	0.72414	0.94207

c. VFS III effect significantly (p < 0.05) attributed to Napier grass
Runoff, Q (m³ s⁻¹)	0	0.048^*	0.44173^*	0.84458^*	0.55644^*	0.003^*	0.082803^*
SSC (mg L⁻¹)	0.5805	0	0.08041^*	0.05381^*	0.25297^*	0.18^*	0.4019^*
Precipitation (mm)	−0.246	−0.524	0	0.81903^*	0.91678^*	0.607^*	0.89969^*
Turbidity, NTU	0.0635	0.568	−0.07408	0	0.7513^*	0.887^*	0.96535^*
Total coliform, CFU (mL⁻¹)	0.189	0.358	0.033868	0.10248	0	0.076^*	0.041563^*
Fecal coliform, CFU 100 mL⁻¹	−0.784	−0.415	0.16578	0.04594	−0.53036	0	2.52E−05^*
E. coli, CFU 100 mL⁻¹	−0.52	−0.267	0.040853	0.01409	−0.59431	0.918	0

p value