Table 1. The horizontal distribution of root length density of Jerusalem artichoke (NY-1) with salinity increasing from S1 to S4 (H1, H2 and H3 represented the sections 0–10, 10–20 and 20–30 cm from the plant center respectively).

Sections	Root length density/(m·m−3)	P0.05
S2H1	2.10 ± 0.14	a
S1H1	1.91 ± 0.04	a
S3H1	1.19 ± 0.21	b
S2H2	0.94 ± 0.23	bc
S1H2	0.78 ± 0.14	cd
S4H1	0.77 ± 0.06	cd
S2H3	0.74 ± 0.18	cd
S1H3	0.62 ± 0.20	de
S4H2	0.52 ± 0.05	de
S4H3	0.50 ± 0.13	de
S3H2	0.43 ± 0.02	e
S3H3	0.43 ± 0.11	e

Means ± standard error (n = 3); means followed by different letters (two-way ANOVA for salinity and horizontal distance followed by Duncan test) are significantly different at P ≤ 0.05.