典型污灌区土壤中Cd的形态、有效性及其影响因子

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Abstract Five typical sewage irrigated soils (i.e. from the sewage irrigated soil sites of Beijing, Shandong, Tianjin, Hebei and Liaoning) were collected. The soils were added with 1.20mg/kg Cd with CdCl₂ solution and incubated for 30d aging period. A pot experiment was conducted to study the bioconcentration factors (BCF), root to shoot translocation coefficient (TF) of Cd by wheat in different sewage irrigation field soils. The soil solution properties of sewage irrigation soil and the forms of Cd in solution (free Cd²⁺) were determined using ion chromatography and WHAM6.0 model. The results showed that significant differences (P<0.05) were observed for the bioconcentration factors (BCF) and root to shoot translocation coefficient (TF) of Cd by wheat in different sewage irrigation soils, the BCFs of Cd in plant shoots ranged from 0.064~0.465, with a maximum variation of 626.5%. Among the tested sewage irrigation soils, the largest BCF of Cd was observed with the brown soil from Liaoning site and the smallest with the brown soil from Shandong site; the variation of root to shoot transfer coefficient (TF) of Cd followed the order of cinnamon soil from Hebei> brown soil from Liaoning> alluvial soil from Beijing> alluvial soil from Tianjin> brown soil from Shandong. Significant (P<0.05) positive correlation were observed between the free Cd²⁺ in soil solutions and the phyto-availability of Cd in different sewage irrigation soils, a significant negative correlation (P<0.001) was observed between the Cd concentrations of plant roots/shoots and the negative logarithm of free Cd²⁺[p(Cd²⁺)] in soil solutions, with the equations of y = -3.3106x+ 17.681(R²=0.929) and y = -0.3389x+1.7743(R²=0.916) for roots and shoots respectively. The changes of free Cd²⁺ in soil solutions [△p(Cd²⁺)] varied significantly among the soils and were affected by soil properties greatly, in general, positive chenshibao@caas.cncorrelations were observed between the △p(Cd²⁺) and pH and EC of the soils, while negative correlation were found between the △p(Cd²⁺) and Cl^-, Na⁺, Ca²⁺ concentration in soil solutions, it can be inferred that the increment of Cl^-, Na⁺, Ca²⁺ content in field soils induced by sewage irrigation will lead to increased environmental risk of Cd in the field soils.

Key words： sewage irrigation fields cadmium speciation bioavailability control factors

Received: 01 February 2016

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	Articles by authors
	HE Jun
	WANG Xue-dong
	CHEN Shi-bao
	LIU Bin
	LI Ning
	ZHENG Han

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HE Jun,WANG Xue-dong,CHEN Shi-bao等. The forms, bioavailability of Cd in soils of typical sewage irrigation fields in northern China and its control factors[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 3056-3063.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I10/3056

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