Effects of Atmospheric Deposition on the Accumulation of Pb, Cd, Hg and As in Rice Plant Organs

doi:10.11924/j.issn.1000-6850.casb20190600266

Abstract

Abstract:

To assess the potential impact of atmospheric deposition on heavy metal accumulation in rice plant, several experiments were carried out in two sites with different air pollution levels. The two experiment sites were located in industrial area and rural area, respectively. For each site, non-polluted and a polluted soils were collected as experimental materials, pot rice growth experiments were carried out in both outdoor and greenhouse. The effects of atmospheric deposition on heavy metal accumulation in different organs of rice plant were evaluated based on the comparison of Pb, Cd, Hg, and As concentration between the two sites or between outdoor and greenhouse experiments. The results showed that soil was an important source of heavy metals in rice plant, and the contents of lead, cadmium, mercury and arsenic in different organs of rice plant from the polluted soil were higher than those in the non-polluted soil. The atmospheric environment and plantation condition had a great influence on the content of heavy metals in the stem and leaf and husk of rice plant, and the content of heavy metals in the stem and leaf and husk of rice plant in the industrial zone was greater than that of rural area. The content of heavy metals in the stem and leaf and husk of rice plant in open field was higher than that in the greenhouse. No significant difference was observed in Pb, Cd, Hg, and As concentration of roots and brown rice between industrial zone and rural area, or between outdoor and greenhouse experiments, indicating that air pollution had no significantly direct effect on the accumulation of heavy metals in brown rice.

Key words: atmospheric deposition, heavy metal accumulation, soil pollution, brown rice, stem and leaf

CLC Number:

Xie Guoxiong, Lou Xuping, Jiang Mingbei, Zhang Mingkui. Effects of Atmospheric Deposition on the Accumulation of Pb, Cd, Hg and As in Rice Plant Organs[J]. Chinese Agricultural Science Bulletin, 2020, 36(22): 86-91.

Figures/Tables 8

References 28

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试验土壤	pH	有机碳/(g/kg)	全Pb/(mg/kg)	全Cd/(mg/kg)	全Hg/(mg/kg)	全As/(mg/kg)
非污染土壤	5.62	17.64	29.14	0.14	0.11	25.40
污染土壤	5.31	19.14	131.56	1.62	0.74	37.81

试验土壤	pH	有机碳/(g/kg)	全Pb/(mg/kg)	全Cd/(mg/kg)	全Hg/(mg/kg)	全As/(mg/kg)
非污染土壤	5.62	17.64	29.14	0.14	0.11	25.40
污染土壤	5.31	19.14	131.56	1.62	0.74	37.81

地点	全Pb	全Cd	全Hg	全As
工业区	634.3±67.4a	31.76±3.18a	4.76±0.72a	143.4±21.6a
农村	53.7±6.78c	4.69±0.76c	0.65±0.35b	56.6±8.4b

地点	全Pb	全Cd	全Hg	全As
工业区	634.3±67.4a	31.76±3.18a	4.76±0.72a	143.4±21.6a
农村	53.7±6.78c	4.69±0.76c	0.65±0.35b	56.6±8.4b

土壤	地点	种植条件	Pb	Cd	Hg	As
非污染土壤	工业区	露天	7.95±1.35b	0.43±0.11b	0.21±0.04b	4.98±0.32b
	工业区	大棚	8.25±2.27b	0.39±0.14b	0.19±0.04b	4.87±0.46b
	农村	露天	8.14±2.05b	0.46±0.12b	0.22±0.05b	5.23±0.47b
	农村	大棚	7.33±1.79b	0.41±0.13b	0.21±0.04b	4.54±0.39b
污染土壤	工业区	露天	28.25±3.65a	2.12±0.21a	0.78±0.14a	11.24±1.24a
	工业区	大棚	29.14±3.12a	1.89±0.28a	0.85±0.17a	10.54±1.68a
	农村	露天	28.68±2.98a	2.09±0.24a	0.84±0.16a	12.45±1.77a
	农村	大棚	27.35±4.12a	1.96±0.19a	0.79±0.18a	11.35±1.37a