Combined effects of salinization and acidification on cadmium activation in greenhouse soil

doi:10.3969/j.issn.1004-1524.2018.05.19

›› 2018, Vol. 30 ›› Issue (5): 810-816.DOI: 10.3969/j.issn.1004-1524.2018.05.19

• Environmental Science • Previous Articles Next Articles

Combined effects of salinization and acidification on cadmium activation in greenhouse soil

WANG Jingwen¹, XIE Guoxiong¹, LI Dan¹, ZHANG Mingkui^2,*

1. Hangzhou Plant Protection and Soil-Fertilizer Station, Hangzhou 310020, China;
2. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China

Received:2017-08-01 Online:2018-05-20 Published:2018-05-23

Abstract

Abstract: Soil salinization and acidification are common in greenhouse soil. Both of them could change the balance of chemical elements in soil, and thus affect the chemical behavior of heavy metals in soil. To understand the effects of simultaneous salinization and acidification on Cd activity in greenhouse soil, changes of soil water-soluble Cd in soil and Cd uptake by vegetable as functions of soil pH, salinity and salt accumulation were observed using simulation experiments. It was shown that water-soluble Cd content in soil and Cd accumulation in upper parts of vegetable increased obviously with the increase of soil acidification and salinization. The change of soil water-soluble Cd concentration in soil with increasing salinity was most obvious at pH 5.00-5.50. For soil with total Cd of 0.55 mg·kg^-1 and soil salinity of 2.50 g·kg^-1, the concentrations of water-soluble Cd in soil increased by 10.53%, 44.00% and 51.06% , respectively, under pH of 6.15, 5.50, and 5.00, as compared with the control soil without salinization. Correspondingly, Cd accumulation in upper parts of vegetable increased by 20.00%, 16.85% and 36.36%, respectively. Meanwhile, concentration of water-soluble Cd in soil and Cd content in the upper parts of vegetable increased by about 4 and 8 times of the control, respectively, when soil pH was reduced from 6.15 to 4.00. The activation of Cd in soil varied with ion composition of salt, and the effect decreased in the order of Ca²⁺,Mg²⁺>K⁺>NH4+ for cation, and Cl^->SO42->NO3- for anion. The results suggested that acidification and salinization occurred simultaneously in the protected soil could significantly increase the activity of soil cadmium. Those two processes had a superimposed effect on the activity of soil Cd.

Key words: facility cultivation, heavy metal, soil quality

CLC Number:

S153.4

WANG Jingwen, XIE Guoxiong, LI Dan, ZHANG Mingkui. Combined effects of salinization and acidification on cadmium activation in greenhouse soil[J]. , 2018, 30(5): 810-816.

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Combined effects of salinization and acidification on cadmium activation in greenhouse soil

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