Table 1.

Means of soil biogeochemical parameters at different depth (0–5, 5–10, 10–20, 20–30 cm) and at different sites (Cypress site and spike + lily). The means were determined using JMP (version 13.2.1; SAS Institute, 2007). The means were from three composite replicates, the data indicate mean ± SEM. The different superscript letters after SEM within a column indicate significant difference between sites means at P < 0.05.

Depth	TC	TN	LOI	13C	15N	pH	C: N
	g kg−1	g kg−1	%	δ‰	δ‰		ratio
Litter
Cypress	486 ± 1.2a	6.5 ± 0.1c		−27.6 ± 0.1c	−2.0 ± 0.2c		75.1 ± 1.0a
Spikerush	450 ± 2.6b	7.4 ± 0.1b		−25.5 ± 0.03b	2.6 ± 0.02a		60.6 ± 1.5b
Water Lily	439 ± 0.3c	18.1 ± 0.1a		−23.8 ± 0.03a	1.1 ± 0.1b		24.3 ± 0.1c
P value	<0.0001	<0.0001		<0.0001	<0.0001		<0.0001
Fermentation layer
Cypress	490 ± 6.9a	17.3 ± 0.7a	94.9 ± 1.0a	−28.1 ± 0.1a	−0.7 ± 0.1a	4.2 ± 4.2a	28.5 ± 1.1a
Spike + lily	430 ± 23.1b	26.0 ± 1.6b	82.3 ± 3.9b	−26.6 ± 0.7b	0.4 ± 0.04b	4.9 ± 4.9b	17 ± 0.9b
P value	0.01043	0.0074	0.0337	0.0168	0.0014	0.0002	0.0012
Sediment
Cypress
0–5 cm	445 ± 14.8a	21.5 ± 1.2a	85.4 ± 4.4a	−27.5 ± 0.1b	−0.1 ± 0.2a	4.0 ± 0.1a	20.8 ± 0.6ab
5–10 cm	431 ± 24.5ab	21.8 ± 1.6a	77.9 ± 3.7a	−26.9 ± 0.03a	1.5 ± 0.2a	3.8 ± 0.1b	19.9 ± 0.9b
10–20 cm	376 ± 31.5ab	16.1 ± 2.5ab	64.7 ± 6.2ab	−27 ± 0.2a	1.8 ± 0.2b	3.8 ± 0.03ab	24 ± 2.2ab
20–30 cm	333 ± 12.7b	12.4 ± 0.8b	44.6 ± 8.0b	−27 ± 0.1a	0.7 ± 0.2c	3.8 ± 0.02b	26.7 ± 0.92a
P	0.0248	0.0091	0.0051	0.0081	0.0002	0.0205	0.0246
Spike + lily
0–5 cm	421 ± 0.56a	27.2 ± 1.5ab	83.6 ± 0.6a	−26.4 ± 0.2b	0.2 ± 0.1b	4.8 ± 0.2a	15.5 ± 0.8ab
5–10 cm	440 ± 0.7a	29.4 ± 0.3ab	86.8 ± 2.8a	−25.7 ± 0.1a	0.4 ± 0.1b	4.6 ± 0.1a	15 ± 0.3b
10–20 cm	350 ± 1.6b	21.8 ± 1.5bc	63.9 ± 3.5a	−26.5 ± 0.1b	1.7 ± 0.2a	4.8 ± 0.04a	16.1 ± 0.4ab
20–30 cm	278 ± 2.1b	15.3 ± 2.1c	65.4 ± 17a	−26.8 ± 0.1b	1.9 ± 0.1a	4.8 ± 0.1a	18.5 ± 1.1a
P value	0.001	0.007	0.2223	0.0034	<0.001	0.604	0.0364

Acronym: LOI – loss in ignition; TC – total carbon; TN – total nitrogen; C: N – carbon nitrogen ratio.