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不同氮(N)源对油菜镉(Cd)吸收积累的影响

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本文利用盆栽试验研究了不同N源对油菜Cd吸收积累的影响.结果表明:施加NH4+-N后,油菜地上部和根系Cd含量及富集系数均较对照显著增加,油菜根际pH和根际总Cd含量均较对照显著降低,油菜根际可交换态Cd含量较对照显著提高,而碳酸盐结合态和铁锰结合态等难溶态Cd含量均较对照下降,根际pH的降低可使根际难溶态Cd转变成可交换态Cd,进而可增加根系对Cd的吸收积累.而NO3--N处理后,Cd含量减少,根际pH和总Cd含量增加,可交换态Cd含量较对照降低,而碳酸盐结合态和铁锰结合态较对照升高,且差异不显著.
Effects of Different Nitrogen(N)Sources on Cadmium(Cd)Absorption and Accumulation by Rape
The greenhouse pot experiment was adopted to discern the effects of different nitrogen sources on cadmium uptake and accumulation by rape.The results showed that after applying NH4+-N,the Cd con-tent and enrichment coefficient in the aboveground and root parts of rapeseed increased significantly compared to the control.The pH and total Cd content in the rhizosphere of rapeseed decreased significantly compared to the control.The exchangeable Cd content in the rhizosphere of rapeseed increased significantly compared to the control,while the content of insoluble Cd such as carbonate bound and iron manganese bound decreased compared to the control.The decrease in rhizosphere pH could transform insoluble Cd in the rhizosphere into exchangeable Cd,thereby increasing the absorption and accumulation of Cd by the roots.After NO3-N treat-ment,the Cd content decreased,the rhizosphere pH and total Cd content increased,and the exchangeable Cd content decreased compared to the control.However,the carbonate bound and iron manganese bound states increased compared to the control,and the difference was not significant.

Nitrogen sourceCadmium absorptionPH in rhizosphereCadmium morphology

边子涵、付欣萍、何奕萱、赵晨曦、周丽洪、储童、陈永亮

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临沂大学生命科学学院,山东 临沂 276000

N源 Cd吸收 根际pH Cd形态

2024

青海农林科技
青海省农林科学院 青海省林学会 青海省农学会

青海农林科技

影响因子:0.183
ISSN:1004-9967
年,卷(期):2024.(3)