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Long-term application of organic amendments changes heavy metals accumulation in wheat grains by affecting soil chemical properties and wheat yields

文献类型： 外文期刊

作者： Wu, Pingping 1 ; Guo, Zhibin 1 ; Hua, Keke 1 ; Wang, Daozhong 1 ;

作者机构： 1.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Hefei 230031, Peoples R China

2.Anhui Prov Key Lab Nutrient Recycling Resources &, Hefei 230031, Peoples R China

关键词： Organic amendment; Livestock manure; Straw; Heavy metals; Wheat grain; Soil chemical properties

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2023 年 23 卷 5 期

页码：

收录情况： SCI

摘要： PurposeThis work was based on a 40-year fertilization experiment to reveal the effect of organic amendments on the accumulation of heavy metals in soils and wheat grains. The results indicated that long-term application of organic amendments changed the accumulation of heavy metals in grains mainly by affecting soil chemical properties and wheat yields rather than soil heavy metals.Organic amendments have been widely used in agricultural practices to improve soil quality and crop yield, but it may lead to heavy metals (HMs) accumulation in the soil when livestock manure is applied. Currently, reports on the effects of organic amendments on HMs enrichment in crop grains are conflicting.Materials and methodsSoils and wheat grains were collected from a 40-year fertilization experiment in the Huang-Huai-Hai Plain in China to determine the concentrations of Cu, Zn, Cd, and As under different fertilization regimes. Additionally, soil chemical properties, available HMs contents, and wheat yields were measured to identify the main factors controlling grain HMs accumulation.Results and discussionThe results showed that, compared to non-fertilized soil, the 40-year application of swine manure markedly increased soil Cu and Zn by 113.5% and 92.3%, respectively; and cattle manure increased soil Cu, Zn, and Cd by 19.2%, 16.7%, and 102.6%, respectively. Straw amendment led to lower Zn content in the soil. Conversely, the concentrations of Cu, Zn, and As in wheat grains were significantly reduced by the application of organic amendments, whereas higher grain Cd was observed in the straw amendment treatment. The partial least squares path model indicated that wheat yield was positively correlated with soil chemical properties, and thus had a strong negative effect on grain Cu, Zn, and As (direct path coefficient = - 0.8541), whereas soil HMs had relatively weak effects. Redundancy analysis further illustrated that alkali-hydrolyzed nitrogen was the primary influencing factor among soil chemical properties, which explained 44.2% of the variation in grain HMs and negatively correlated with the concentrations of Cu, Zn, and As in wheat grains. Soil pH was negatively correlated grain Cd concentration and explained 40.8% of the grain HMs variation.ConclusionsLong-term application of livestock manure reduces the accumulation of Cu, Zn, and As in wheat grains by promoting soil chemical properties and wheat yields, while straw amendment increases grain Cd mainly due to lower soil pH. Soil HMs had weak effect on grain HMs.

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