Influences of salinity on mass and energy dynamics during decomposition of Kandelia candel leaf litter

doi:10.3773/j.issn.1005-264x.2010.12.003

Abstract

Abstract:

Aims Our objective is to investigate the impact of salinity on decomposition of Kandelia candel leaf litter.
Methods Four laboratory treatments with different salinities (0, 10‰, 25‰ and 35‰ salinity, representing fresh water and low, medium and high salinity treatments, respectively) were set up to simulate tidal conditions for leaf litter decomposition. We analyzed dry weight, nitrogen (N) and phosphorus (P) contents, their release rates and energy loss of leaf litter at different decomposition stages under these four treatments.
Important findings Percentage weight loss and mean rate of decomposition (MRD) in high salinity treatment were significantly lower than in fresh water and low salinity treatments. Theoretical time required for 50% loss of dry weight of leaf litter was highest in high salinity treatment. Salinity significantly affected the dynamic variation of N and P in leaf detritus. The N release rate of leaf detritus tended to increase with higher salinity, resulting in lowest N content in the high salinity treatment. During the first week, fresh water and the low salinity treatment were found to accelerate the release of P, but P content was lower under medium and high salinity than other treatments. The caloric values of leaf detritus were significantly higher in fresh water and low salinity treatments than in the high salinity treatment; however, no significant difference was found in percentage energy loss during decomposition under different salinities.

Key words: caloric value, decomposition, Kandelia candel, leaf litter, nitrogen, phosphorus, salinity

HU Hong-You, ZHANG Zhao-Chao, LI Xiong. Influences of salinity on mass and energy dynamics during decomposition of Kandelia candel leaf litter[J]. Chin J Plant Ecol, 2010, 34(12): 1377-1385.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2010.12.003

https://www.plant-ecology.com/EN/Y2010/V34/I12/1377

Figures/Tables 7

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分解时间 Decomposition time (week)	r₁^?	r₂^?	r₃^?
1	-0.426	-0.198	-0.900***
2	-0.107	-0.956**	-0.119
3	-0.507	-0.265	0.194
6	-0.719	0.654*	0.829**
9	-0.983**	0.841**	-0.454

分解时间 Decomposition time (week)	r₁^?	r₂^?	r₃^?
1	-0.426	-0.198	-0.900***
2	-0.107	-0.956**	-0.119
3	-0.507	-0.265	0.194
6	-0.719	0.654*	0.829**
9	-0.983**	0.841**	-0.454

盐度 Salinity (‰)	拟合方程 Fitted equation	r	半分解期 Half-time of decomposition (d)
0	Y = 0.035 0-0.008 9t	-0.991 6^**	82
10	Y = -0.037 7-0.007 4t	-0.992 8^**	89
25	Y = 0.004 7-0.006 9t	-0.987 9^**	101
35	Y = 0.005 7-0.006 6t	-0.994 3^**	106

盐度 Salinity (‰)	拟合方程 Fitted equation	r	半分解期 Half-time of decomposition (d)
0	Y = 0.035 0-0.008 9t	-0.991 6^**	82
10	Y = -0.037 7-0.007 4t	-0.992 8^**	89
25	Y = 0.004 7-0.006 9t	-0.987 9^**	101
35	Y = 0.005 7-0.006 6t	-0.994 3^**	106

营养元素 Nutritive element (%)	盐度 Salinity (‰)	第0周 Initial value	第1周 1st week	第2周 2nd week	第3周 3rd week	第6周 6th week	第9周 9th week
TN	0	0.636 ± 0.068^a	1.475 ± 0.094^a	0.975 ± 0.112^c	1.100 ± 0.124^a	1.344 ± 0.117^b	1.483 ± 0.051^a
	10	0.636 ± 0.068^a	1.008 ± 0.322^c	1.120 ± 0.030^b	1.077 ± 0.124^a	1.594 ± 0.076^a	1.223 ± 0.122^b
	25	0.636 ± 0.068^a	1.205 ± 0.014^bc	1.398 ± 0.125^a	1.243 ± 0.071^a	1.342 ± 0.107^b	0.751 ± 0.122^c
	35	0.636 ± 0.068^a	1.253 ± 0.125^b	1.363 ± 0.043^a	1.053 ± 0.149^a	0.926 ± 0.046^c	0.901 ± 0.112^c
TP	0	0.043 ± 0.000^a	0.019 ± 0.001^d	0.034 ± 0.001^b	0.039 ± 0.002^a	0.043 ± 0.000^a	0.022 ± 0.001^b
	10	0.043 ± 0.000^a	0.033 ± 0.001^c	0.020 ± 0.001^d	0.017 ± 0.001^c	0.016 ± 0.001^b	0.014 ± 0.001^c
	25	0.043 ± 0.000^a	0.043 ± 0.001^a	0.038 ± 0.001^a	0.019 ± 0.001^c	0.012 ± 0.000^c	0.010 ± 0.001^d
	35	0.043 ± 0.000^a	0.039 ± 0.001^b	0.029 ± 0.000^c	0.032 ± 0.000^b	0.011 ± 0.001^d	0.034 ± 0.001^a