Microcosm study on fate and dynamics of mangrove tannins during leaf litter leaching

Ecological Processes

Table 5 Mass balances of condensed tannins (ECT and BCT: extractable and bound forms, respectively) in leaf litter of three mangrove species before and after 216 h leaching and their dynamic changes in leachates during the leaching experiment

Species	Dynamics of ECT and BCT in leaf litter (mg)		Theoretical calculation value of ECT in leachates (mg)^c	Dynamics of ECT in leachates from different leaching processes (mg)											P (%)^d
Species	Decreases of ECT^a	Increases of BCT^b	Theoretical calculation value of ECT in leachates (mg)^c	6 h	12 h	24 h	48 h	72 h	96 h	120 h	144 h	168 h	192 h	216 h	P (%)^d
Ko	654.8 ± 10.5 (93.7%)	311.6 ± 10.1 (47.6%)	343.2 ± 10.3 (52.4%)	0.1	1.1	7.9	11.8	21.7	24.1	28.6	19.6	13.9	7.2	4.3	8.3
Ac	739.2 ± 22.9 (84.7%)	299.0 ± 11.7 (40.4%)	440.2 ± 15.5 (59.6%)	8.0	19.3	22.7	25.8	30.7	37.3	39.0	41.2	30.4	16.4	13.2	9.4
Sa	92.0 ± 5.3 (76.0%)	4.0 ± 0.5 (4.3%)	88.0 ± 4.7 (95.7%)	0.0	0.0	0.0	1.2	2.6	2.7	3.2	4.0	6.8	4.8	4.1	7.7

^aDecrease of ECT = weight of ECT in leaf litter before leaching – after leaching, and percentage (value in bracket) = decrease of ECT/Total ECT before leaching
^bIncreases of BCT = weight of BCT in leaf litter after leaching – before leaching, and percentage (value in bracket) = increase of BCT/decrease of ECT
^cCalculated value of ECT in leachates = decrease of ECT – increase of BCT, and percentages (value in bracket) = ECT in leachate / decrease of ECT
^dP means the proportion = peak value of ECT in leachate/theoretically calculated value of ECT in leachate after leaching
The bold figure in each line indicates the peak value of ECT weight in leachate
Ko: K. obovata, Ac: A. corniculatum, and Sa: S. apetala