摘要
通过盆栽试验和Tessier连续提取法,研究了蔬菜根际和非根际土壤中钒的形态分布与植物有效性。结果表明,钒在根际和非根际土壤中主要以残渣态和铁锰氧化物结合态存在,钒的含量随其形态不同而变化:当土壤中钒添加量从25mg·kg-1增加到200mg·kg-1时,根际土壤交换态钒的百分率增加了9.89%,碳酸盐结合态钒增加了9.38%,铁锰氧化物结合态钒增加了9.99%,残渣态钒的百分率下降了33.6%。土壤添加的钒量增加时,钒的迁移能力增强,使蔬菜的生物量显著降低,蔬菜对钒的吸收作用增强:钒添加量从0增至200mg·kg-1时,蔬菜鲜质量降低了41.65%,而蔬菜中85%以上的钒积累在根部。根际土壤中碳酸盐结合态钒含量对植物的根、茎叶中钒含量有显著影响,碳酸盐结合态钒与蔬菜鲜质量呈显著负相关。
The tessier sequential extraction technique was adopted to study the speciation and phyto-availahility of vanadium in vegetable rhizosphere and non-rhizosphere by a pot experiment. Results showed that vanadium speciation in vegetable rhizosphere and non-rhizosphere was mainly residual and Fe-Mn oxide-bound species, and content of every vanadium species varied with its speciation. With increas- ing of the additive vanadium in soil from 25 mg· kg^-1 to 200 mg· kg^-1, content of different vanadium species in rhizosphere also increased ： exchangeable species increased by 9.89%, carbonate-bound species by 9.38%, and Fe-Mn oxide-bound species by 9.99%, whereas residual species decreased by 33.6%. Higher content of the additive vanadium in soil resulted in increasing of transfer competence of vanadium and absorption of vanadium by vegetable. When content of additive vanadium reached 200mg· kg^-1, biomass of vegetable was decreased by 41.6% ,while content of additive vanadium was higher than 100 mg· kg^-1, vanadium in vegetable more than 85% was accumulated in vegetable root. Vanadium content in root, stem and leaf of vegetable was affected obviously by content of the carbonate-bound vanadium species in rhizospherc, with the correlation coefficient 0.992 6, 0.992 7 respectively. There was obviously a negative correlation between fresh mass of vegetable and content of the carbonate-bound vanadium species in rhizosphere, with a correlation coefficient -0.995 4.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第7期1353-1357,共5页
Journal of Agro-Environment Science
基金
广西自然科学基金(桂科自0728218
桂科自0679005)
广西环境工程与保护评价重点实验室研究基金(桂科能0701k013)
广西高校人才小高地建设"环境工程"创新团队资助计划项目(桂教人[2007]71)
广西壮族自治区教育创新人才基地资助项目
关键词
钒
形态
蔬菜
根际环境
植物有效性
vanadium
speciation
vegetable
rhizosphere
phyto-availability
