镉胁迫对不同植烟土壤硝化速率及N<sub>2</sub>O排放的影响

许琳; 刘跃东; 高加明; 李方明; 彭玉龙; 刘明宏; 林伟; 徐茜; 孙朝辉; 张继光

doi:10.13496/j.issn.1007-5119.2022.01.006

镉胁迫对不同植烟土壤硝化速率及N₂O排放的影响

许琳^1,2,
刘跃东²,
高加明³,
李方明³,
彭玉龙⁴,
刘明宏⁴,
林伟⁵,
徐茜⁵,
孙朝辉^1, ,,
张继光^2, ,

1. 青岛农业大学, 青岛 266109;
2. 中国农业科学院烟草研究所, 青岛 266101;
3. 湖北省烟草公司恩施州公司, 湖北恩施 445000;
4. 贵州省烟草公司遵义市公司, 贵州遵义 563000;
5. 福建省烟草公司南平市公司, 福建南平 353000

基金项目:

中国农业科学院科技创新工程（ASTIP-TRIC06）；湖北省烟草公司科技项目（027Y2019-017）；福建省烟草公司南平市公司科技项目（2017350724070）；贵州省烟草公司遵义市公司科技项目（201703）

详细信息

作者简介:
许琳(1996-),女,在读硕士研究生,主要从事农田土壤碳氮调控及其环境效应研究。E-mial:770399694@qq.com

通讯作者:
孙朝辉,E-mail:Zhsun163@163.com

张继光,E-mail:zhangjiguang@caas.cn

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出版历程
- 收稿日期: 2021-07-04
- 修回日期: 2021-12-08
- 网络出版日期: 2023-11-30
- 刊出日期: 2022-02-27

Effects of Cd Stress on Nitrification Rate and N²O Emission in Tobacco Planting Soils

1. Qingdao Agricultural University, Qingdao 266109, China;
2. Tobacco Research Institute of CAAS, Qingdao 266101, China;
3. Enshi Tobacco Company of Hubei Province, Enshi, Hubei 445000, China;
4. Zunyi Tobacco Branch Company, Zunyi, Guizhou 563000, China;
5. Fujian Nanping Tobacco Branch Company, Nanping, Fujian 353000, China

摘要

摘要: 为明确镉(Cd)胁迫对不同植烟土壤的硝化速率及氧化亚氮(N₂O)排放的影响,采用外源镉添加试验,设置两个 Cd浓度梯度(10和100mg/kg),以探究Cd胁迫下中性(中性土1和2)和酸性(酸性土1和2)植烟土壤的净硝化速率以及N₂O排放特征。结果表明:1)随培养时间增加,植烟土壤铵态氮含量逐渐减少,而硝态氮含量逐渐增加,且低Cd胁迫和高Cd胁迫均未显著改变这一变化趋势;2)植烟土壤净硝化速率在培养前期(1~7 d)发生较大波动变化,Cd胁迫明显增加了酸性土1在第1天的净硝化速率;3)整体上各处理酸性土的N₂O排放速率和累积排放量高于中性土,高Cd胁迫增加了酸性土1的N₂O初始排放速率,培养结束后酸性土1的N₂O累积排放量达355.42μg/kg;4)各植烟土壤N₂O排放速率和累积排放量与土壤pH和全氮含量极显著负相关,而与有机质和铵态氮含量极显著正相关。本研究结果表明植烟土壤的N₂O排放受土壤酸碱性和氮底物的影响,酸性土的N₂O累积排放量高于中性土,且高Cd胁迫增加其N₂O排放量,后续可通过土壤酸化改良以达到N₂O减排目的。
- 植烟土壤 /
- 氧化亚氮 /
- 镉胁迫 /
- 净硝化速率
Abstract: In order to determine the effect of cadmium stress on nitrification rate and N₂O emission traits of different tobacco planting soils,an incubation experiment of acid and neutral soils under two concentrations (10 and 100 mg/kg) of Cd addition were conducted. The results showed that,1) The concentration of ammonium in acid and neutral tobacco soils decreased gradually with the extension of incubation time,while the concentration of nitrate increased throughout the whole incubation periods,and this tendency was not affected by low and high concentrations of Cd stress;2) Soil net nitrification rate fluctuated strongly during the 1-7 d of incubation and Cd stress could stimulate net nitrification rate of acid soil type 1 on the 1st day;3) The maximum of N₂O emission rate and cumulative emission of acid soils were higher than that of neutral soils in general,and the high Cd stress could stimulate the initial N₂O emission rate of acid soil 1,and the cumulative N₂O emission of acid soil 1 was 355.42 μg/kg at the end of the incubation;4) Soil pH and total nitrogen had significantly negative correlations with soil N₂O emission rate and cumulative emission,but soil organic matter and ammonium had significantly positive correlations with soil N₂O emission rate and the cumulative emission.These results indicated that N₂O emission of tobacco planting soils was affected by soil pH and N substrate.The N₂O cumulative emission of acid soils was much higher than neutral soils and they could be stimulated by the high Cd stress.So,the reduction of N₂O emission could be achieved by improving soil acidification in the future.
- tobacco planting soil /
- nitrous oxide /
- cadmium stress /
- net nitrification rate

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