Table 1 Relationships between sediment physicochemical properties and vegetation characteristics in a mangrove chronosequence at Zhanjiang, China as indicated by stepwise regression analyses.

	Sediment physicochemical properties	Vegetation characteristics	P	r²	Regression equation
Wet season	SOM	CB, PD	0.007	0.787	SOM = 0.685 + 0.362CB + 0.948PD
	TN	PD, CB	0.001	0.769	TN = 0.054 + 0.062PD + 0.011CB
	TP	PD	0.002	0.518	TP = 0.036 + 0.027*PD
	TK	PD	0.001	0.571	TK = 0.596 + 0.377*PD
	AP	CC, PH	0.010	0.919	AP = 14.842-8.322CC-2.383PH
	AN	PD	0.003	0.494	AN = 9.090 + 6.837*PD
	AK	–	–	–	–
	Salinity	–	–	–	–
Dry season	SOM	CB, PD	0.007	0.815	SOM = 0.804 + 0.364CB + 0.854PD
	TN	CB, PD	0.002	0.740	TN = 0.050 + 0.012CB + 0.050PD
	TP	PD	0.004	0.479	TP = 0.039 + 0.023*PD
	TK	PD	0.002	0.532	TK = 0.664 + 0.401*PD
	AP	CC	<0.001	0.897	AP = 23.859-21.966*CC
	AN	PD	0.001	0.554	AN = 4.176 + 3.276*PD
	AK	PD	0.001	0.600	AK = 458.705 + 404.695*PD
	Salinity	PD	0.001	0.576	Salinity = 17.512 + 6.569*PD

The data were collected by Chen et al. ³⁹, and the analysis was conducted as part of the current study. SOM = sediment organic matter content; TN = total sediment nitrogen content; TP = total sediment phosphorus content; TK = total sediment potassium content; AP = sediment available phosphorus content; AK = sediment available potassium content; AN = sediment ammonium nitrogen content.
PH = plant height; CB = plant crown breadth; CC = coverage/canopy density; PD = plant density.

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