Relative Susceptibility of Thirteen Pine Species to Sodium Chloride Spray

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Figure 1.
Yearly height growth of sodium chloride-treated pine seedlings (expressed as a per cent of water-treated trees). Years 2, 3, and 4 refer to the second, third, and fourth years after the first year of salt treatment.

Table 1.

Foliar symptoms and survival of 13 pine species subjected to NaCI spray

Specie.	Average symptoms (%)^{^z} (treated minus control) Time after the first year's spraying ende.			Survival of treated plants (expressed as % survival of control plants)^{^y} Time after the first year's spraying ende.
Specie.	2 weeks	4 weeks	17 weeks	17 weeks	1 year	2 years	2½ years
P. thunbergii	0 a	0 a	3 a	100	100	89	89
P. ponderosa	1 ab	2 ab	6 ab	100	95	95	95
P. nigra	5 bc	3 abc	5 ab	95	85	89	89
P. strobiformis	6 bcd	6 bcd	37 bc	90	80	75	65
P. cembra	6 bcd	5 bcd	24 abc	80	59*	47*	6*
P. densiflora	7 cd	11 cde	27 abc	57*	46*	32*	32*
P. aristata	7 cd	21 e	43 c	50*	43*	38*	17*
P. parviflora	11 cde	25 e	46 c	63	71	73	40*
P. peuce	12 cde	22 e	28 abc	67	50*	33*	17*
P. resinosa	14 de	17 de	42 c	47*	42*	37*	26*
P. sylvestris	14 de	23 e	33 bc	90	80	70*	60*
P. banksiana	18 ef	17 de	44 c	68	44*	22*	11*
P. strobus	27 f	45 f	85 d	40*	40*	25*	15*

↵z Mean separation within columns by Duncan’s New Multiple Range Test, 5% level. Numbers followed by the same letter within columns not considered significantly different.
↵y An asterisk indicates a significant decrease at the 5% level in the number of seedlings surviving the salt spray compared to those surviving the water spray treatment.

Table 2.

Average chloride and sodium concentrations in needles from pine seedlings treated with NaCl^{^z}.

Specie.	Needle Surface Chloride (% dry wt.	Internal Chloride (% dry wt.	Internal Sodium (% dry wt.
P. thunbergii	.024 ab	1.164 bcd	.620 abcd
P. ponderosa	.013 a	0.606 a	.435 a
P. nigra	.033 bcd	1.026 bcd	.637 bcd
P. strobiformis	.021 ab	0.983 bc	.585 abc
P. cembra	.024 ab	0.940 b	.483 ab
P. densiflora	.056 def	1.404 cde	.758 cde
P. aristata	.037 bede	1.440 de	1.440 de
P. parviflora	1.440 de	1.708 ef	1.330 fg
P. peuce	.041 cde	1.714 ef	1.714 ef
P. resinosa	.035 bede	1.447 de	0.859 def
P. sylvestris	.040 cde	1.814 ef	1.303 fg
P. banksiana	.044 cde	1.353 bede	0.741 cde
P. strobus	.093 f	2.151 f	1.347 g

↵z Mean separation within columns by Duncan’s New Multiple Range Test, 5% level. Numbers followed by the same letter within columns are not considered significantly different.