Cadmium Availability in a Soil-Rice System Receiving Four Consecutive Seasons of Straw Removal.

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Bulletin of Environmental Contamination and Toxicology Pub Date : 2025-09-09 DOI:10.1007/s00128-025-04113-x

Jialin Zhang, Hanhua Zhu, Chao Xu, Shen Zheng, Hui Wang, Bo Li, Daoyou Huang, Huajing Wang, Quan Zhang, Qihong Zhu

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Abstract

Cadmium (Cd) pollution in rice agroecosystems has become a pressing worldwide environmental challenge. Straw return leads to Cd re-entering the soil, yet the impact of straw removal (SR) on Cd mobility and bioavailability within this system remains unclear. We implemented a four-season field study to evaluate how different SR intensities (NSR: no rice straw was removed; HSR: half of the rice straw was removed; TSR: all the rice straw was removed) influence Cd availability in this system. Our findings indicated that after three and four consecutive seasons of SR, the DTPA-extractable Cd levels showed notable reductions of 12.2% and 13.7%, respectively. SR also decreased grain Cd concentration (Cd_G) in subsequent seasons, demonstrating a dose-dependent response. The Cd_G after one, two, three, and four seasons of TSR treatment fell by 9.0%, 25.2%, 16.8%, and 41.7%, respectively, compared to that following NSR treatment. Notably, late-season SR proved more effective in Cd_G reduction than early-season SR. Statistical analysis confirmed a strong positive association between Cd_G and DTPA-extractable Cd. The primary mechanism underlying Cd_G reduction appears to be the decreased Cd bioavailability in soil resulting from SR practices. These findings establish multi-season total straw removal as a sustainable phyto-management strategy for Cd-polluted rice cultivation systems.

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连续四季秸秆去除对土壤-水稻系统镉有效性的影响

水稻农业生态系统镉污染已成为一个紧迫的全球性环境挑战。秸秆还田导致Cd重新进入土壤，但秸秆去除（SR）对该系统内Cd流动性和生物有效性的影响尚不清楚。我们实施了一项为期四年的实地研究，以评估不同SR强度（NSR：没有秸秆被去除；HSR：一半秸秆被去除；TSR：所有秸秆被去除）对该系统中Cd有效性的影响。结果表明，连续3个和4个SR季节后，dtpa可提取Cd水平分别显著降低12.2%和13.7%。SR在随后的季节也降低了谷物Cd浓度（CdG），显示出剂量依赖性反应。与NSR治疗相比，TSR治疗1、2、3、4个季节的CdG分别下降9.0%、25.2%、16.8%和41.7%。值得注意的是，季末SR比季初SR更有效地减少CdG。统计分析证实CdG与dtpa可提取Cd之间存在强烈的正相关关系。CdG减少的主要机制似乎是SR导致土壤中Cd的生物有效性降低。这些研究结果表明，在cd污染的水稻栽培系统中，多季节全秸秆清除是一种可持续的植物管理策略。

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来源期刊

Bulletin of Environmental Contamination and Toxicology 环境科学-毒理学

CiteScore

5.60

自引率

3.70%

发文量

230

审稿时长

1.7 months

期刊介绍： The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.