镧在草-菇-土系统中的循环与生物富集效应  

Biological cycle and accumulation of lanthanum in the forage-mushroom-soil system

作　　者：翁伯琦[1] 姜照伟[2] 王义祥[1] 黄元仿[3] 

机构地区：[1]福建省农业科学院农业生态研究所,福州350013 [2]福建省农业科学院水稻研究所,福州350019 [3]中国农业大学资源与环境学院,北京100094

出　　处：《生态学报》2011年第14期3973-3979,共7页Acta Ecologica Sinica

基　　金：国家科技支撑计划项目(2007BAD89B13);福建省农业科学院创新团队项目(STIF-Y01)资助

摘　　要：利用稀土镧肥种植牧草南非马唐,采用含镧牧草栽培杏鲍菇和以菇渣作为有机肥种植牧草进行连续性试验,研究镧在草-菇-土系统中的分配与生物富集情况。结果表明:施镧处理的南非马唐和杏鲍菇各器官的镧元素含量均高于不施镧处理,其中镧在牧草南非马唐中的分布为根>叶>茎,镧在杏鲍菇中的分布为菌盖>菌柄;外源镧进入土壤以后,南非马唐不同器官的镧元素生物富集系数均随着镧施入量的增加而增大,其中以根的镧生物富集系数最大,介于0.443—0.580之间。除高剂量(M4)处理外,叶和茎的镧生物富集系数不同处理间无显著差异,但根出现明显变化;含镧牧草栽培杏鲍菇和菇渣种植南非马唐后,不同器官的镧含量无显著增加,说明镧残留在草-菇-土系统中迁移转化效率降低。Rare earth elements（REE） and their compounds have been widely applied in agronomic and medical fields for many years.The bioinorganic chemical research of REE in the past few years indicates that REE play important roles in the promotion of photosynthesis,root absorption,and regulation of hormone and nitrogen metabolism.There was an increasing interest in the bioaccumulation processes of rare earth elements（REEs） due to the wide application of REEs in a variety of non-nuclear industries and agriculture,resulting in possible environmental contamination.Investigations into the bioaccumulation characteristics of REEs have been carried out in recent years as sensitive techniques such as inductively coupled plasma-mass spectrometry（ICP-MS） and neutron activation analysis（NAA） have became available.Despite extensive studies on REE uptake and transport in plants,few studies have been carried out on the REE fractionation in the soil plant system via laboratory experiments.However,little attention has been paid to the REE fractionation and migration in the multi-link food chain.In this study,three cultivation experiments were carried out,including the pot experiments of Digitaria smutsii cultivation with La fertilizer and mushroom residue fertilizer,and the experiment of Pleurotus eryngii cultivation using La-applied forages as medium.The distribution and biological concentration of lanthanum（La） in the forage-mushroom-soil system were discussed.The results showed that the trend of La adsorption of D.smutsii were root leaf stem.La concentration in all organs of forage increased with the increase of La application rate.La relative content of roots in La application treatments rose significantly,increasing by 10.76%-31.37% compared with the control.The yield of P.eryngii fruitbodies with the La application treatment increased by 16.10% compared with that of the no-La application treatment,but there was no significant difference between them.The trend of La adsorption of P.eryngii were pileus stipe.There

关 键 词：镧 草-菇-土系统 循环 生物富集 南非马唐 杏鲍菇 

分 类 号：S181[农业科学—农业基础科学]