Table 2.  Annual average input of cations in salt spray (In) and output of the leachate from 60 cm below the surface on the sand (Out) in kg×ha-1×yr-1 for three zones of the foredune at Bodie and Ocracoke islands, North Carolina (from van der Valk 1974b).
	Potassium		Sodium		Calcium		Magnesium
Zone	In	Out	In	Out	In	Out	In	Out
Back	18	15	310	280	19	11	42	36
Top	42	37	740	720	44	34	100	97
Front	77	71	1,300	1,300	80	74	180	180
Back	13	13	250	250	39	37	37	39
Top	28	26	530	520	82	88	78	77
Front	42	37	780	710	120	130	120	110