| 施用凹凸棒石对Cd污染农田土壤养分的影响 |
| |
| 引用本文： | 赵廷伟,李洪达,周薇,代允超,吕家珑.施用凹凸棒石对Cd污染农田土壤养分的影响[J].农业环境科学学报,2019,38(10):2313-2318. |
| |
| 作者姓名： | 赵廷伟 李洪达 周薇 代允超 吕家珑 |
| |
| 作者单位： | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100,西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100,西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100,西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100,西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 |
| |
| 基金项目： | 陕西省科技统筹创新工程计划项目（2016KTZDNY03-01）；陕西省重点研发计划项目-重点产业创新链（2019ZDLNY01-02-01） |
| |
| 摘 要： | 为研究凹凸棒石黏土矿物对Cd污染农田土壤的影响,以及对植物吸收Cd的阻控作用,通过大田试验,以凹凸棒石作为化学修复剂,以Cd污染土壤为研究对象,研究了凹凸棒石修复Cd污染土壤的效果以及对作物吸收Cd的影响。结果表明:适量添加凹凸棒石对土壤速效养分无显著影响,但过量施用时(1.25 kg·m~(-2)),导致土壤碱解氮、有效磷含量分别降低6.76 mg·kg~(-1)和7.34mg·kg~(-1);添加凹凸棒石会显著提高土壤pH和CEC含量,凹凸棒石添加1.25 kg·m~(-2)时,土壤pH最高可增加0.51个单位、CEC升高6.29 cmol·kg~(-1);添加凹凸棒石会显著降低土壤有效态Cd含量,随其添加量的增加有效态Cd含量最高可降低27.66%(添加量1.25kg·m~(-2));添加凹凸棒石能显著降低作物籽粒中Cd含量,添加量为1.25 kg·m-2时,油菜籽粒中Cd含量可降低35.19%,小麦籽粒中Cd含量可降低37.29%。由于凹凸棒石的过量施用会导致土壤肥力下降,因此,在耕种农田上利用凹凸棒石进行Cd污染的化学修复,一定要控制施用量和施用频次,在修复的同时尽量不要使土壤肥力水平降低。
|
| 关 键 词： | Cd 凹凸棒石 化学钝化修复 有效态Cd 农田 |
| 收稿时间： | 2019/7/14 0:00:00 |
Effects of attapulgite application on soil nutrients in Cd-contaminated farmland |
| |
| Institution: | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China,College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China,College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China,College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China and College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China |
| |
| Abstract: | To investigate the effects of attapulgite clay minerals on cadmium-contaminated farmland soils and the impedance control of Cd uptake by plants, this study treated attapulgite as a chemical repair agent and applied it to Cd-contaminated soils. The effects of attapulgite application rates on the remediation of Cd-contaminated soil and amount of Cd uptake by plants were evaluated. The results showed that only attapulgite application rates greater than 1.25 kg·m-2 reduce nitrogen and phosphorus available in the soil by 6.76 mg·kg-1 and 7.34 mg·kg-1, respectively. In addition, the application of attapulgite significantly increases soil pH and CEC content. For instance, attapulgite of 1.25 kg·m-2 reduces the effective Cd content in soil by 27.66%, while increasing soil pH by 0.51 and CEC by 6.29 cmol·kg-1,respectively.The results also showed that Cd content could be reduced by 35.19% in rapeseed and 37.29% wheat grains at the same attapulgite application rate.However, excessive application of attapulgite can lead to a decline in soil fertility; as such, appropriate application rates of attapulgite and intervals between two applications should be used to repair the Cd-contaminated farmland to control pollution while maintaining soil fertility. |
| |
| Keywords: | Cd attapulgite chemical passivation repair effective Cd farmland |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《农业环境科学学报》浏览原始摘要信息 |
| 点击此处可从《农业环境科学学报》下载免费的PDF全文 |
|
