镁肥对土壤铅生物有效性的影响  

Effect of Magnesium Fertilizer of Lead Bioavailability of Soil

作　　者：聂督[1] 王庶陶[2] 丁玉川[1] 关春林[1] 

机构地区：[1]山西省农业科学院农业环境与资源研究所/山西省土壤环境与养分资源重点实验室,太原030006 [2]山西省农业科学院,太原030006

出　　处：《农学学报》2013年第5期26-30,共5页Journal of Agriculture

基　　金：山西省科技攻关项目"山西省主要土壤类型镁供应能力及其镁肥效应研究"(20080311026)

摘　　要：铅污染土壤可通过蔬菜消费威胁人类健康。为降低铅污染土壤中铅的生物有效性,减轻铅对作物的伤害,以菠菜(Spinacia oleraceaL.)为试验作物,采用盆栽试验方法,设置75、150、300mg/kg3个硫酸镁施用量,125、1000mg/kg2个铅污染浓度,研究施用硫酸镁肥对土壤中外源铅生物有效性的影响。结果表明,不同铅浓度对菠菜生长、产量和养分吸收都有显著的影响。铅的浓度越大,对作物伤害越大。在铅污染土壤中适当施用镁肥,可以促进菠菜生长,增加产量,叶片叶绿素、维生素C含量以及氮、磷、钾养分吸收量均明显提高,而铅浓度明显下降。相关分析表明,菠菜镁吸收量与铅吸收量呈显著性负相关关系。研究结果表明,适量镁肥的施用可降低土壤中铅的生物有效性,减轻铅对作物的伤害,提高产量,改善品质,这对轻度铅污染土壤改良和菠菜高产优质生产具有一定的指导意义。Lead （Pb） contamination of soil poses severe health risks to humans through vegetable consumption. In order to reduce the lead bioavailability of lead-contaminated soil, alleviate lead harm to crops, a soil pot experiment was conducted to investigate the effect of magnesium fertilizer on lead bioavailability of soil. The trial crop was spinach （Spinacia oleracea L.）. The experiment design was the randomized complete block with four replications. Three rates of magnesium fertilizer （75, 150, 300 mg/kg） and two lead concentrations （125, 1000 mg/kg were employed. The results showed that the different lead concentrations had significant influence on the growth, fresh yield and nutrient uptake of spinach. The stronger of lead concentration, the grater of lead harm to plants. Appropriate application of magnesium fertilizer in lead-contaminated soil can promote spinach growth, increase fresh yield, enhance the contents of leaf chlorophyll and vitamin C, and increase the amount of N, P and K absorbed by spinach plants. Correlation analysis revealed that the relationship between the amount of magnesium absorbed and the amount of lead absorbed by spinach plants was significantly positive correlation. This study indicated that appropriate application of magnesium fertilizer can reduce lead bioavailability in the lead-contaminated soil, alleviate lead harm to plants, increase production and improve quality. It had certain direct function to improve slight lead-contaminated soils and high yield and high quality production of spinach.

关 键 词：镁肥 铅 生物有效性 养分吸收 

分 类 号：S636.1[农业科学—蔬菜学] S143.7[农业科学—园艺学]