Vertical Uneven Distribution of Salt in the Root Zone Affects the Distribution of Na+ Ion and Heavy

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  Pot experiments were conducted in the greenhouse to determine the effect of vertical uneven distribution of salt in the root-zone on the distribution of salt ion(Na+) and heavy metal ions (Cd2+, Pb2+, Cr2+, Zn2+, Cu2+, Ni2+) in different organs of tomato plants (Lycopersicon esculentum Mill.var.Yazhoufenwang) from April to July in 2014.The results showed that Na+ concentration within root, shoots, leaves and fruits was not affected by the mean salt concentration in the whole root-zone, but by the salt content in the upper layer soil.There was a significant linear relationship between salt concentration in the top layer soil and Na+ concentrations in the whole plant (P<0.01).However, the concentration of Cd, Pb, Cr,Zn, Cu, Ni and Mn in shoots and roots were not significantly influenced neither by mean salt concentration in the whole root-zone nor the upper part of root-zone.The Na concentrations of tomato plants in roots always showed the highest value in roots, followed by leaves and stem,and fruits had the lowest values in the orangs for all the treatments.Similar to Na concentration, the heavy metal concentrations always showed higher value in roots in all the treatments than leaves, fruits and stems of tomato plants.Interestingly, the contents of Cr and Mn in tomato fruits of T1 treatment (the salt concentration in the upper and lower soil of the root-zone were both 1%) were significant higher than those of T2, T3 and T4 treatments (the ratio of salt concentration in the upper and lower soil of the root-zone were 1‰ ∶ 5‰, 2‰ ∶ 4‰ and 3‰ ∶ 3‰ for T2, T3 and T4 treatments, respectively), which might be related to the higher water consumption and lager mean root density in the root-zone.The results provide some useful scientific information for the agricultural land use of saline soil in the coastline area of Jiangsu Province.
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