| 小麦籽粒镉含量影响因素Meta分析和决策树分析 |
| 摘要点击 1315 全文点击 453 投稿时间：2022-04-08 修订日期：2022-06-21 |
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| 中文关键词 小麦 镉 影响因素 Meta分析 决策树分析 |
| 英文关键词 wheat cadmium influence factor Meta-analysis decision tree analysis |
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| 中文摘要 |
| 快速的城市化、工业化和农业集约化造成了严重的土壤问题，如土壤酸化和镉污染等，严重威胁着中国的粮食安全和人体健康.小麦是中国第二大粮食作物，对镉有较强的积累能力.探明小麦籽粒镉含量的影响因素对保障小麦安全生产至关重要.然而，目前对小麦籽粒镉含量的影响因素还缺乏全面和定量的分析.对近10年发表的56篇相关论文进行Meta分析和决策树分析，结果表明，土壤样点中镉含量超过农用地土壤污染风险筛选值的比例为52.6%，小麦籽粒镉含量超过食品安全国家标准（0.10 mg ·kg-1，GB 2762-2017）的比例为64.1%.土壤理化性质中，pH、有机质、有效磷和土壤全镉含量是影响小麦籽粒镉含量的重要因素.土壤的pH≤5.5和5.5-1≤土壤有机质含量<30 g ·kg-1时，小麦籽粒镉含量超标率最高，为61.0%.农田土壤的pH≥ 7.1且全镉含量<1.60 mg ·kg-1时有利于小麦安全生产.不同小麦品种籽粒镉含量和镉富集因子存在差异，种植低镉积累小麦品种是降低小麦籽粒镉含量的经济有效措施.研究结果可为镉污染农田小麦安全生产提供科学依据. |
| 英文摘要 |
| Rapid urbanization, industrialization, and agricultural intensification have resulted in serious soil problems, such as soil acidification and cadmium pollution, affecting food security and human health. Wheat is the second largest food crop in China and has a strong accumulation capacity for cadmium. Understanding the influencing factors of cadmium content in wheat grain is crucial to realize the safe production of wheat. However, a comprehensive and quantitative analysis of how soil physicochemical properties and cultivars affect wheat cadmium accumulation is lacking. The Meta-analysis and decision tree analysis of 56 related studies published in the past 10 years showed that the proportion of cadmium content in soil and wheat grain exceeding the national standard was 52.6% and 64.1%, respectively. Among soil physical and chemical properties, pH, organic matter, available phosphorus, and total soil cadmium content were the important factors affecting the cadmium content in wheat grains. When soil pH ≤ 5.5 and 5.5-1-1, the proportion of cadmium content in wheat grain exceeding the national standard was the highest (61.0%). Soil pH ≥ 7.1 and total cadmium content <1.60 mg·kg-1 was suitable for wheat safety production. There were significant differences in grain cadmium content and cadmium enrichment factors among different wheat cultivars. Planting wheat cultivars with low cadmium accumulation is an economical and effective measure to decrease cadmium content in wheat grains. The current study can provide guidance for the safe production of wheat in cadmium-contaminated farmland. |
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