Effects of elevated CO2 on the Cd uptake by rice in Cd-contaminated paddy soils

土壤水分 污染 环境化学 化学 水田 农学 土壤污染 环境科学 环境工程 土壤科学 生态学 生物
作者
Xiong Yang,Dongming Wang,Ye Tao,Min Shen,Wei Wei,Chuang Cai,Changfeng Ding,Jiuyu Li,Lian Song,Bin Yin,Chunwu Zhu
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:442: 130140-130140 被引量:20
标识
DOI:10.1016/j.jhazmat.2022.130140
摘要

The rising atmospheric CO2 is a major driver for climate change, directly affects rice production. Cadmium (Cd) in paddy soils also serves as a persistent concern. Currently, few studies consider the rice response to coupled stresses of elevated CO2 (eCO2) and soil Cd. Experimental evidence understanding the effects and mechanisms of eCO2 on Cd uptake by rice is lacking yet. In a free-air CO2 enrichment (FACE) system, a 3-year pot experiment was conducted to explore the Cd uptake by rice under two CO2 conditions (ambient and ambient + 200 µmol·mol−1) using combinations of in-situ Cd-contaminated soils and associated rice varieties. Results showed that more low-crystalline Fe oxides (Feh) in iron plaque (IP) were deposited on root surface with the increased dissolved Fe2+ due to lower soil redox status under eCO2. The Cd accumulation in rice was hindered due to more Cd associated with Feh (Feh-Cd) rather than uptake by roots. Taken together, the relative effects of eCO2 on Cd uptake by rice were consistent across years under different Cd-contaminated soils. Our findings will help to better understand the Cd uptake by rice under future climate conditions, and thus push the development of climate-crop-soil models and accurate prediction for food security.
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