长期清除稻草和双季稻制可降低土壤中的镉含量和水稻对镉的吸收:为期四年的实地分析

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-06-06 DOI:10.1016/j.jes.2024.05.050
Beibei Tian, Yihao Yang, Anwei Chen, Liang Peng, Xiao Deng, Yang Yang, Qingru Zeng, Si Luo
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摘要

多项研究表明,将农作物秸秆还田可能会加剧农业土壤中的镉(Cd)污染。然而,长期秸秆管理方法对土壤-水稻生态系统中镉浓度及其生物利用率的具体影响仍不清楚。在此背景下,为了探索秸秆还田(SR)和秸秆清除(NSR)对双季稻系统中土壤和水稻中镉积累的影响,我们开展了一项为期四年的田间研究。研究结果表明,在两个研究地点,秸秆还田持续降低了土壤中的镉浓度及其生物利用率,降幅分别约为 16.93%-27.30% 和 8.23%-21.05% 。相反,SR 则使土壤中镉的生物利用率大幅提高,范围从 38.64% 到 53.95%。值得注意的是,与 NSR 相比,SR 使土壤总镉显著增加了 5.47%-36.58%,使糙米中的镉含量增加了 8.00%-100.24%。值得注意的是,经过连续四年的 NSR 后,长丰基地的糙米镉浓度符合国家安全标准(GB 2762-2022)。此外,早稻秸秆还田显著提高了后茬作物的土壤镉生物利用率,比晚稻秸秆还田对第二年早稻的影响更大。研究结果表明,湖南省传统的双季稻种植与秸秆还田可有效降低农作物和农田的镉污染风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Long-term straw removal and double-cropping system reduce soil cadmium content and uptake in rice: A four-year field analysis

Several studies have demonstrated that reintroducing crop straw to fields may intensify cadmium (Cd) contamination in agricultural soils. However, the specific effects of long-term straw management practices on Cd concentration and its bioavailability in soil-rice ecosystems remain unclear. In this context, to explore the influence of straw return (SR) and straw removal (NSR) on Cd accumulation in both soil and rice within a double-cropping system, we conducted a four-year field study. Our research study unveiled that NSR consistently decreased soil Cd concentration and its bioavailability by approximately 16.93%–27.30% and 8.23%–21.05% respectively across both study sites. Conversely, SR resulted in a substantial increase in soil Cd bioavailability, ranging from 38.64%–53.95%. Notably, compared to NSR, SR significantly increased total soil Cd by 5.47%–36.58% and increased Cd content in brown rice by 8.00%–100.24%. Remarkably, after four consecutive years of NSR, brown rice Cd concentration at the Changfeng site compiled with national safety standards (GB 2762–2022). Additionally, returning early rice straw significantly raised soil Cd bioavailability for the subsequent crop, more so than late rice straw did for the early rice the following year. The findings suggest that traditional double-cropping cultivation with straw removal can effectively mitigate Cd contamination risks in crops and farmland in Hunan Province.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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