摘 要随我国农业设施快速发展,高强度的施肥,污水灌溉等,导致大量盐分及重金属进入土壤,导致农产品安全风险增加。土壤盐分的增加,也会增加蔬菜对重金属的吸收,因此在盐渍土壤上筛选低吸收重金属的蔬菜品种,已迫在眉睫。本文采用重金属Cu平均含量为30.06mg/kg的蔬菜地土,在外源NaCl处理下进行盆栽试验,试验研究了在不同盐分浓度下,空心菜和上海青两种蔬菜对土壤中重金属Cu的积累差异,结果表明:1.不同品种的植物在盐胁迫下的生长差异较明显;2. 盐胁迫下抑制了空心菜根叶中Cu含量的累计;相反地,上海青的叶中Cu含量累积明显;3. 盐胁迫下,土壤重金属Cu主要以残余态和有机结合态形式存在,还有占极小部分的交换态,并且土壤理化性质与其交换态存在显著的相关性。52390
毕业论文关键词:盐分胁迫、叶菜、重金属Cu、品种差异
Abstract With the rapid development of facility agriculture , high levels of fertilizer, sewage irrigation and heavy metals into the soil, lead to security risks and increase in soil salinity . Using average contents of Cu-30.06mg/kg of heavy metals in vegetable soil, external NaCl under pot experiment were studied at different salt concentration. Cu accumulation of heavy metals in vegetables and soil is different, the results show that: 1)the growth of cultivated varieties of plants under salt stress differences are more obvious; 2)Salt stress-induced inhibits Cu content in leaves; in contrast, the leaf content of Cu accumulation is obvious; 3)under salt stress, the soil heavy metal Cu mainly exist in the form of residual state and the organic combination state, and a tiny part of the exchange of state, and there is significant correlation with exchange state of soil physical and chemical properties.
Key words: Salinity stress;Vegetable;Heavy metal-Cu;Cultivar difference
目 录
1 引言 3
1.1 土壤盐渍化现状 3
1.2 土壤重金属污染现状 4
1.3 研究意义 4
2 实验材料与方法 5
2.1 样品采集 5
2.2 盆栽实验 5
2.3 实验样品处理及测定方法 5
2.3.1 土壤pH的测定 5
2.3.2 土壤DOC的测定 5
2.3.3 土壤TC、TN值的测定 6
2.3.4 土壤、植物重金属全量的测定 6
2.3.5 两种叶菜的生物量测定 6
2.3.6 土壤重金属Cu的形态分布测定 7
2.4 实验数据记录与处理 7
3 结果与分析 7
3.1 空心菜、上海青在盐胁迫下的生物量 7
3.2 不同盐胁迫下两叶菜蔬菜根叶中Cu含量 8
3.3 两叶菜在盐胁迫下重金属Cu富集特性与转运特性 9
3.3.1 两叶菜对土壤重金属Cu的富集特性(BCF)测定 9
3.3.2 两叶菜对土壤重金属Cu的转运系数(TF)测定 10
3.4 盆栽前后土壤理化性质及重金属形态变化 12
3.4.1 盆栽前后土壤pH、DOC、TC、TN的变化 12
3.4.2 蔬菜种植后土壤重金属Cu形态变化