水稻秸秆炭对水稻镉吸收的影响
毕业论文关键词：镉污染土壤； 水稻秸秆炭；水稻籽粒镉；土壤有效态镉
Effect of Rice Straw Biochar on Cadmium Content of Rice Grain
Abstract: With the migration of soil-plant-food chain, the cadmium exceeding events such as "cadmium rice events" and " the out of limits of urinary cadmium " caused by farmland soil pollution have caused strong social response.The attention and improvement on the quality of rice is of great significance in the environment with increasing soil pollution. In this study, we choose the paddy field which has been contaminated for a long time and rice straw charcoal to provide effective control methods of cadmium -contaminated areas .The result shows that rice straw charcoal can significantly increase the pH of the contaminated soil, which is 0.27（15 t/ ha) and 0.41(20t /ha) units higher than that of the control group. The available cadmium in soil decreases by 40.2% and 73.0%, and the absorption of cadmium in rice is significantly decreased by 30.4% and 51.6%, which shows that rice straw charcoal can be the better repairing material for heavy metal -contaminated areas.
Key words:soil polluted by Cd; rice straw biochar; Cd in grain; soil available Cd
目录
摘要1
关键词1
Abstract1
Key words1
引言1
1 材料与方法2
1.1 材料 2
1.1.1 供试水稻秸秆炭2
1.1.2 供试水稻品种2
1.1.3 供试水稻2
1.2方法 2
1.2.1 田间实验方案 2
1.2.2 土壤样品采集3
1.2.3 土壤pH值测定3
1.2.4 土壤重金属样品的消化3
1.2.5土壤镉有效态的测定4
1.2.6 土壤镉样品含量测定4
1.2.7 水稻籽粒样品消煮4
1.2.8水稻籽粒镉样品含量测定4
1.2.9 数据分析4
2 结果与分析4
2.1水稻秸秆炭对土壤pH的影响4
2.2 CaCl2浸提态Cd的变化 4
2.3 污染土壤施用水稻秸秆炭后土壤pH与有效态镉的相关性 5
2.4 水稻秸秆炭对水稻籽粒吸收镉的影响6
2.5 水稻籽粒Cd含量与土壤有效态Cd的关系7
3 结论 8
4 创新点 8
5 不足之处和研究展望 8
致谢9
参考文献 10
水稻秸秆炭对水稻镉吸收的影响
引言：镉为重金属“五毒”元素之首，具有移动性强、降解难、毒性强等特点[1] 。在矿区生产的水稻的籽粒镉含量严重超标，籽粒中镉含量大于或等于0.2 mg kg-1时即为镉米，矿区居民因长期食用“镉米”出现“骨痛病”等症状[2] 。因此，研究土壤镉污染防治技术具有重要意义。根据处理时污染土壤的位置是否一致,治理技术可分为原位治理和异位治理。异位治理可更有效地限制污染范围，但成本高、环境扰动大。原位治理操作简单，但处理的时间较长。根据治理原理的不同,重金属污染土壤的治理技术可分为植物修复、微生物修复、化学修复、物理修复和综合修复等。物理修复主要包括客土、换土、去表土和深耕翻土等。化学修复主要包括化学淋洗技术、溶剂浸提修复技术、化学氧化/还原技术、土壤性能改良修复技术等。以上治理措施效果彻底,但可能实施复杂、生态风险大、治理费用高[3]。
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