雨水携带过氧化氢对水稻-土壤系统中粪肥来源的 Cu 和 Zn 形态分布和生物有效性的影响。

Effect of rainwater-borne hydrogen peroxide on manure-derived Cu and Zn speciation distribution and bioavailability in rice-soil system.

机构信息

College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China; Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China; Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou, China.

College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China.

出版信息

Ecotoxicol Environ Saf. 2019 Aug 15;177:1-6. doi: 10.1016/j.ecoenv.2019.03.108. Epub 2019 Apr 4.

DOI:10.1016/j.ecoenv.2019.03.108

PMID:30954007

Abstract

Pot experiment was conducted to examine the effects of rainwater-borne hydrogen peroxide (HO) on transformation of Cu, Zn from pig manure in soils and its resulting impacts on the growth of Cu and Zn uptake by a rice plant. Results showed that the exogenous application of HO signiﬁcantly improved the rice biomass and yield. Addition of HO into the soils led to reduced uptake of soil-borne Cu and Zn by the rice plants and this had a signiﬁcant effect on reducing the accumulation of Zn in rice grains. It was indicated that the increased pH in soil might play important role in reducing Cu and Zn content in rice. Furthermore, Cu and Zn content in exchangeable form and carbonate bounded form dramatically decreased in soil, on the contrary, the organic combination state increased significantly in HO treatment. The findings point to a potential research direction that rainwater-borne HO in nature may help to change morphology of heavy metals in natural soil environments, but further study is still needed to explore the related mechanisms in Cu and Zn in manures and paddy rice ﬁeld receiving rainwater-borne HO.

摘要

采用盆栽试验研究了雨水携带的过氧化氢（HO）对猪粪中 Cu、Zn 在土壤中转化及其对水稻吸收 Cu、Zn 的影响。结果表明，HO 的外源添加显著提高了水稻的生物量和产量。HO 的添加降低了土壤中 Cu、Zn 向水稻的迁移，这显著降低了 Zn 在水稻籽粒中的积累。土壤 pH 值的升高可能在降低水稻中 Cu、Zn 含量方面发挥了重要作用。此外，HO 处理显著降低了土壤中交换态和碳酸盐结合态 Cu、Zn 的含量，而有机结合态 Cu、Zn 的含量则显著增加。这些发现表明，自然环境中雨水携带的 HO 可能有助于改变天然土壤环境中重金属的形态，但仍需要进一步研究来探索在接受雨水携带的 HO 的猪粪和稻田中 Cu、Zn 的相关机制。