摘要
[目的]探究不同添加量生物炭对镉铅复合污染土壤中小白菜(Brassica chinensis L.)镉铅积累及营养品质的影响,以期为农产品安全生产提供参考依据.[方法]采用盆栽试验,研究土壤中添加0％、0.5％、1％、2％的生物炭对小白菜生长及营养品质、Cd和Pb的积累、土壤理化性质及酶活性的影响.[结果]在土壤中添加1％、2％生物炭后,土壤DTPA提取态Cd和Pb显著低于对照,土壤pH值、有机质、速效磷和速效钾含量、土壤脲酶与蔗糖酶活性均显著高于对照.生物炭促进了小白菜的生长及营养品质的提升,地上部干重、可溶性糖和维生素C含量均显著高于对照;同时,生物炭显著降低了小白菜各部位对Cd和Pb的积累,尤以地上部降低最为显著,较对照分别降低了27.53％～71.46％和31.00％～55.43％.1％和2％生物炭对小白菜生长、营养品质和重金属含量都有显著影响,但两者间无差异.[结论]生物炭添加到土壤后,一方面通过提高土壤pH值,降低了土壤重金属有效性,抑制了小白菜对Cd、Pb的积累,进而影响了作物品质;另一方面生物炭促进了土壤养分循环,增加了土壤有效养分含量,最终改善了小白菜的生长状况及营养品质.
Abstract
[Objective]To explore the effects of different proportions of biochar on cadmium(Cd)and lead(Pb)accumulation and quality of Brassica chinensis L.in Cd and Pb compound polluted soil,in order to provide a scientific basis for the safety in production of agricultural products.[Method]A pot experiment was conducted to study the effects of 0％,0.5％,1％and 2％biochar on the growth,nutritional quality,Cd and Pb accumulation of Brassica chinensis L.,soil physicochemical properties and enzymes activities.[Result]After adding 1％and 2％biochar,the contents of DTPA-Cd and DTPA-Pb in soil were significantly lower than that of the control,while the soil pH,organic matter,available phosphorus and available potassium contents as well as soil enzymes activities(urease,sucrase)were significantly higher than the control.The growth and nutritional quality of Brassica chinensis L.were improved by adding biochar,with significantly higher shoot dry weight,soluble sugar content and vitamin C content.Meanwhile,the contents of Cd and Pb in Brassica chinensis L.were significantly decreased under biochar treatments,especially in the shoot,which decreased by 27.53％～71.46％and 31.00％～55.43％compared to the control,respectively.1％and 2％biochar had significant effects on the growth,quality and heavy metal content of Brassica chinensis L.,but there was no significant difference between them.[Conclusion]Biochar reduces the availability of heavy metals in soil by increasing soil pH,inhibiting the accumulation of Cd and Pb in Brassica chinensis L.,and thus improve the nutritional quality.Meanwhile,biochar promotes soil nutrient cycling,increases soil available nutrient content,and finally improves the growth and nutritional quality of Brassica chinensis L..
基金项目
四川省科技计划重点研发项目(2021YFN0018)
成都市重点研发支撑计划(2021-YF05-00959-SN)
四川省科学技术厅应用基础研究项目(2021YJ0341)
NETL
NSTL
维普
万方数据