磷铁及水分对土壤砷有效性和小麦吸收的影响

摘要：砷是环境中主要无机污染物之一，砷在农作物中的积累是砷进入食物链的主要途径。通过外源调控措施改变土壤中砷的结合状态将会影响植物对砷的吸收。通过室内盆栽试验来研究P、Fe和不同水分含量对土壤砷有效性和植物吸收砷的影响。研究结果表明，加Fe处理能吸附土壤溶液和植物地上部砷元素缓解砷毒害，但对不同分级处理下的土壤砷各有效态效果各不相同。施加不同形态磷酸盐后，土壤溶液中砷的浓度显著增加，其中以不加铁的Ca(H2PO4)2处理最明显。但是小麦地上部分砷的含量与土壤溶液中砷的浓度并没有显著的相关性。饱和水处理时土壤溶液和土壤各提取态砷的含量略高于干湿交替处理，但没有显著差异。35412
毕业论文关键词：砷污染；砷含量；小麦吸收
Effects of P, Fe and Water on Soil Arsenic Availability and Wheat Absorption
Abstract：Arsenic is one of the main inorganic pollutants in the environment.The accumulation of arsenic in crops is the main route of arsenic entry into the food chain. The use of exogenous control measures to alter the binding of arsenic in the soil will affect plant uptake of arsenic.Pot experiments were conducted to investigate the effects of P, Fe and different water contents on soil arsenic availability and arsenic uptake by plants.The results show that adding Fe can adsorb arsenic in soil solution and plant upper part to relieve arsenic toxicity,but the effects of different fractions of soil arsenic availability are different.After applying different forms of phosphate,the concentration of arsenic in soil solution increased significantly,the iron free Ca(H2PO4)2 treatment is most obvious.However, the content of arsenic in the upper part of wheat is not significantly correlated with the concentration of arsenic in the soil solution.When saturated water treatment, the content of arsenic in soil solution and soil was slightly higher than dry and wet treatment, but there is no significant difference between them.
Key words: Arsenic contamination；Arsenic content；Wheat absorption
目录
摘要1
关键词1
Abstract…1
Key words1
引言…1
1材料与方法…2
1.1供试土壤 …2
1.2供试材料 …2
1.3盆栽试验2
1.3.1植物培养方法2
1.3.2 植物样品砷含量测定…2
1.3.3 土壤中不同结合态砷的提取3
1.3.4 砷含量的测定3
1.4 数据处理3
2 结果与分析…3
2.1土壤溶液砷含量…3
2.2小麦地上部分砷含量4
2.3土壤分级处理各级砷含量4
2.4小麦地上部砷含量与土壤砷之间的关系5
3讨论 6
3.1铁对土壤砷形态和小麦砷吸收的影响…6
3.2磷对土壤砷形态和小麦砷吸收的影响…7
3.3不同水分含量对土壤砷形态和小麦砷吸收的影响7
致谢…7
参考文献8
P、Fe及水分对土壤砷有效性和小麦吸收的影响
引言砷是自然界中广泛存在的一种有污染效应的类金属，含砷物质常被用作一些工农业生产原料，由此引起的砷污染问题也越来越受到整个社会的高度关注[1]。尽管土壤对积聚的金属元素有一定净化作用，但由于土壤环境容量不是无限的[2]，所以当含砷污染物进入土壤后，经常会因为砷在土壤中不能得到充分净化而积累，造成不同程度的土壤砷污染[3]。而且重、轻工业大规模生产环节所产生的废气、废渣等也会携带砷并散落在土壤中，进而造成土壤砷污染[4]。
与植物正常生长代谢所必需的元素不同，砷对植物而言是非必需元素，而且对植物有显著的毒害作用[5]，研究表明植物体内的砷含量、砷有效形态和植物的某些生理特性与其所生长土壤的砷含量、砷的不同形态有明显的关系[6]。磷铁及水分对土壤砷有效性和小麦吸收的影响:http://www.youerw.com/shengwu/lunwen_33351.html