天然沸石对土壤镉及番茄生物量的影响

Effects of natural zeolite addition on Cd in soil and tomato biomass

为了探索沸石对轻度镉污染土壤的修复效果及对番茄生长的影响,利用盆栽试验研究了不同沸石添加量及不同沸石粒级等因素对不同生长时期番茄(Solanum lycopersicum)植株生物量、果实产量和土壤镉质量分数的影响。结果表明,添加沸石均不同程度地提高不同生长期番茄地上部生物量和果实产量;每千克土壤添加10 g的大粒级(MX)沸石使得土壤全镉和有效镉增加最多,同时也使番茄果实增产最多,每千克土壤添加18 g的小粒级(MN)沸石使得土壤全镉质量分数有所降低,土壤有效镉质量分数增加最少,同时也可使番茄果实增产42.9%以上。小粒级(MN)沸石为削减土壤重金属镉的最佳沸石粒级,18 g.kg-1为削减土壤重金属镉的最佳沸石添加量。

In order to investigate the restoration effect on Cd mildly contaminated soil with zeolite and the influences on tomato growing,a pot experiment was carried out to study on the effects of addition of zeolite with different amounts and particle sizes on plant biomass,fruit yields of tomato and Cd concentration in soil.Results showed that with the addition of zeolite,the aboveground biomass and fruit yields of tomato could be increased;The total Cd,available Cd in soil and fruit yields of tomato had the highest increase by mixing 10 g zeolite of maximal particle size（MX） with 1 kg soil;By mixing 18 g zeolite of minimal particle size（MN） with 1 kg soil,the total Cd in soil had decreased while the available Cd in soil had the lowest increase compared to that of CK,and the fruit yields of tomato had increased more 42.9%.Adding zeolite of minimal particle size（MN） was relatively the best particle size treatment to decrease Cd in soil.18 g zeolite with 1 kg soil was relatively the best additive amount treatment to decrease Cd in soil.