AM真菌和牛粪对铅污染土壤的修复效应

铅污染会对环境和人体健康产生较大风险,如何修复污染土壤、降低农产品中的铅残留值得深入研究。在温室盆栽条件下研究了接种丛枝菌根(AM)真菌、施加牛粪及复合处理对铅污染土壤的修复效应和机理。结果表明,在所有铅污染水平下,接种AM 真菌、施加牛粪和复合处理均显著促进烟草生长,改善烟草磷营养。复合处理在所有铅污染水平下均降低烟草铅残留量,而施加牛粪仅在轻度和中度铅污染水平下、接种AM 真菌仅在重度污染水平下作用显著。土壤pH 升高,铅有效性降低。可见,AM 真菌和有机肥对铅污染地区优质烟叶生产及铅污染土壤的植物修复具有一定的应用潜力。

Effects of AM Inoculation and Cattle Manure on the Remediation of Lead Polluted Soil

Lead (Pb) in foods poses great hazards to health of consumers, and measures to remediate Pb pollution and to reduce Pb residues in farm products deserve much attention. The effects and mechanisms of arbuscular mycorrhizal (AM) inoculation and cattle manure on the remediation of Pb polluted soil were studied in a pot experiment. The results showed that, at all Pb levels, AM inoculation and cattle manure, applied singly or in combination, all increased shoot and root dry matter yields of tobacco significantly, and improved P nutrition. Treatment with both AM inoculation and manure produced significant decrements on Pb residues at all pollution levels, while AM fungal inoculation did at heavy pollution level, and cattle manure did at slight and moderate pollution levels. The higher soil pH and lower DTPA-extractable Pb content contributed by AM fungal inoculation and/or organic amendments may be one of the contributing factors resulted in a lower Pb toxicity and higher tobacco growth. Our results show a promising potential of AM fungi and organic manure in the production of quality tobacco and phyto-remediation of Pb-polluted soils.