-
摘要：生物质炭是生物质原料在完全或部分缺氧条件下高温热解后的产物，它具有丰富的孔隙结构和较高的含碳量，能有效地降低重金属污染物的生物有效性和迁移率，对改善土壤环境具有重大意义。本研究选取河南某市一块受冶炼厂污水排放污染的小麦地，分别施用0 t ha-1（C0）、20 t ha-1（C20）、40 t ha-1(C40)的小麦秸秆炭于镉污染麦田，研究不同施用量对小麦吸收土壤中重金属镉的抑制作用，以期为在镉污染农田修复提供参考。研究发现生物质炭施用量为40 t ha-1的处理将土壤pH由8.01增至8.25，20 t ha-1的处理增至8.08；且C40和C20处理分别使土壤SOC增加29.74%和8.37%；小麦增产14.29%、8.43%；与对照相比，使用20 t ha-1（C20）、40 t ha-1(C40)的小麦秸秆炭使土壤有效态镉（ CaCl2 提取态）含量分别降低了51.37%、29.52%；使小麦籽实中镉含量分别降低了18.99%和6.14%。29024
- 上一篇：土壤中阿特拉津测定方法研究+文献综述
- 下一篇：人工纳米富勒在不同水体中的稳定性研究
毕业论文关键词：生物质炭；土壤性质；镉污染；小麦籽粒
Effect of Wheat Straw biochar on Cadmium Content in Whear Grain
Abstract: Biochar is the product of biomass raw material pyrolysis under full or partial hypoxic conditions. It has abundant pore structure and high carbon content, which can effectively reduce the bioavailability and mobility of heavy metal pollutants. , To improve the soil environment is of great significance. In this study, wheat straw with 0 t ha-1 (C0), 20 t ha-1 (C20) and 40 t ha-1 (C40) was applied to a wheat field polluted by a smelter in Henan province. Cadmium contaminated wheat field, and to study the inhibitory effect of different application rates on cadmium cadmium in wheat uptake in order to provide reference for cadmium contaminated farmland. The results showed that the soil pH increased from 8.01 to 8.25 and the treatment of 20 t ha-1 increased to 8.08, and the soil SOC increased by 29.74% and 8.37%, respectively, and the C40 and C20 treatments increased the soil SOC by 40 t ha-1was increased by 14.29% and 8.43%, respectively. Compared with the control, the content of soil available cadmium (CaCl2) was decreased by using wheat straw with 20 t ha-1 (C20) and 40 t ha-1 (C40) 51.37% and 29.52%, respectively. The contents of cadmium in wheat seed were reduced by 18.99% and 6.14%, respectively.
Key words: biochar; soil properties; cadmium pollution; wheat grain
目 录
摘要1
关键词1
Abstract1
Key words1
引言1
1材料与方法2
1.1试验设计 2
1.2受试土壤及材料 2
1.3样品采集及测定2
1.3.1植株样品的采集与测定2
1.3.2土壤样品的与测定3
1.4 数据统计与分析方法3
2结果与分析 3
2.1施用生物质炭对土壤pH、容重和SOC的影响 3
2.2施用生物质炭对小麦产量的影响4
2.3施用生物质炭对土壤有效态镉含量和小麦籽粒Cd含量的影响5
3讨论 6
3.1生物质炭对土壤性质的影响 6
3.2生物质炭提高作物产量和降低植物对镉的吸收的作用 6
3.3研究不足与展望 6
4结论 6
致谢7
参考文献7
小麦秸秆炭对旱地土壤镉的治理效果的研究 随着我国经济的快速发展，土壤环境污染问题日益严重。但由于土壤污染问题不如水污染以及大气污染一样能够直观的被人们所感受，土壤污染问题在一定程度上得不到应有的重视。而有报道称我国总污染耕地面积已达1000万公顷，每年受重金属污染的粮食有1200万吨之多。土壤污染问题中的重金属污染值得引起人类的重视。有研究表明，在几种主要的土壤重金属污染元素中，发生镉元素污染的概率最高，镉和汞的污染指数最高[1-2]。土壤中的重金属来源广泛，工矿企业排放的废气、废渣、废水，化肥、农药、及污水灌溉都能使土壤中重金属含量增加。[3]而重金属镉在土壤中的含量较高，对人体的伤害极大，长期摄入镉将会危害人的造血、神经、肾脏等器官的功能。[4]“痛痛病”就是最典型的镉中毒例子。