Effects of Water Management and Silicon Application on Iron Plaque Formation and Uptake of Arsenic and Cadmium by Rice

被引：0

作者：

Chen J. ^{[1
]}

Zhao X.-L. ^{[1
]}

机构：

[1] College of Resources and Environment, Southwest University, Chongqing

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 03期

关键词：

Arsenic cadmium co-contamination; Bioavailability; Rice; Silicon; Water management;

D O I：

10.13227/j.hjkx.202008147

中图分类号：

学科分类号：

摘要：

To explore the effects of water management and silicon application on the bioavailability of soil arsenic (As) and cadmium (Cd), and the accumulation of As and Cd in rice, pot experiments were carried out using As/Cd co-contaminated paddy soil from a field in Kaiyang County, Guizhou Province. The experimental treatments had the following five water application modes with and without silicon addition: flooding during the entire growth period (T1); flooding for three weeks (0-105 d) after transplanting with wet irrigation (moisture content 50%-60%) during other growth periods (T2); flooding for three weeks before heading (0-65d), three weeks after heading (84-105d), and wet irrigation during other growth periods (T3); flooding from heading to three weeks after heading (84-105d) and wet irrigation during the other growth periods (T4); and wet irrigation during the entire growth period (T5). The results showed that compared with flooding and wet irrigation, flooding combined with wet irrigation was more conducive to the formation of iron plaque (DCB-Fe) on the surfaces of roots. As and Cd content increased with an increasing of content of DCB-Fe. Silicon application increased soil pH and the content of DCB-As but decreased available As and Cd in the soil and, with the exception of the flooding treatment, the DCB-Fe/Cd content. The shorter the flooding time, the higher the accumulation of Cd and the lower the accumulation of As in each part of the rice. Silicon application increased the biomass of rice but decrease the Cd content of roots, stems, leaves, and grain by 4.23%-31.06%, 11.41%-52.90%, 1.74%-35.73%, and 19.25%-39.76%, respectively. Silicon application also decreased the As content of roots, stems, leaves, and grain by 1.47%-52.60%, 6.12%-63.02%, 2.97%-28.41%, and 16.33%-61.23%, respectively. Among the five modes of water application tested, silicon application combined with the T3 mode achieved the highest rice biomass and lowest rice As and Cd contents. Therefore, it is suggested that selecting water management and silicon application regimes according to the level of As/Cd pollution can effectively decrease the bioavailability of As/Cd in the soil, thereby reducing the accumulation of As/Cd in rice. © 2021, Science Press. All right reserved.

引用

页码：1535 / 1544

页数：9

共 47 条

[11]

(2005)

[12]

Uraguchi S, Fujiwara T., Cadmium transport and tolerance in rice: perspectives for reducing grain cadmium accumulation, Rice, 5, 1, (2012)

[13]

Takahashi Y, Minamikawa R, Hattori K H, Et al., Arsenic behavior in paddy fields during the cycle of flooded and non-flooded periods, Environmental Science & Technology, 38, 4, pp. 1038-1044, (2004)

[14]

Wu J, Ji X H, Wei W, Et al., Effect of water levels on cadmium and arsenic absorption and transportation in rice, Journal of Agro-Environment Science, 37, 7, pp. 1427-1434, (2018)

[15]

Honma T, Ohba H, Kaneko-Kadokura A, Et al., Optimal soil Eh, pH, and water management for simultaneously minimizing arsenic and cadmium concentrations in rice grains, Environmental Science & Technology, 50, 8, pp. 4178-4185, (2016)

[16]

Chen Z, Tie B Q, Lei M, Et al., Phytoexclusion potential studies of si fertilization modes on rice cadmium, Environmental Science, 35, 7, pp. 2762-2770, (2014)

[17]

Kim Y H, Khan A L, Kim D H, Et al., Silicon mitigates heavy metal stress by regulating P-type heavy metal ATPases, Oryza sativa low silicon genes, and endogenous phytohormones, BMC Plant Biology, 14, 1, (2014)

[18]

Li R Y, Stroud J L, Ma J F, Et al., Mitigation of arsenic accumulation in rice with water management and silicon fertilization, Environmental Science & Technology, 43, 10, pp. 3778-3783, (2009)

[19]

pp. 10-12, (2019)

[20]

Arao T, Kawasaki A, Baba K, Et al., Effects of water management on cadmium and arsenic accumulation and dimethylarsinic acid concentrations in Japanese rice, Environmental science & Technology, 43, 24, pp. 9361-9367, (2009)

← 1 2 3 4 5 →