引用本文:陈顺涛,朱同彬,陈建秋,单 军,颜晓元.三氯生和三氯卡班对水稻土好氧氮转化及N2O排放的影响[J].土壤学报,2019,56(4):873-882. DOI:10.11766/trxb201810110437
CHEN Shuntao,ZHU Tongbin,CHEN Jianqiu,SHAN Jun,YAN Xiaoyuan.Influence of Triclosan and Triclocarban on Aerobic N Transformation and N2O Release in Paddy Soil[J].Acta Pedologica Sinica,2019,56(4):873-882. DOI:10.11766/trxb201810110437
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三氯生和三氯卡班对水稻土好氧氮转化及N2O排放的影响
陈顺涛1, 朱同彬2, 陈建秋1, 单 军3, 颜晓元3
1.中国药科大学工学院;2.中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室;3.中国科学院南京土壤研究所
摘要:
三氯生(Triclosan, TCS)和三氯卡班(Triclocarban, TCC)是典型的药品与个人护理用品,在土壤生态系统中被广泛检出,且存在增加土壤微生物抗药性及抑制土壤呼吸的潜在风险,但目前有关TCS和TCC对土壤氮转化过程及氧化亚氮(N2O)排放的影响尚不清楚。基于此,采用室内培养实验和15N稀释-富集法,结合氮转化数值模型,研究了不同浓度梯度下TCS(2和5 mg·kg-1)和TCC(1和2 mg·kg-1)的单独及联合存在对水稻土氮初级转化速率以及N2O排放的影响。结果表明,1 mg·kg-1 TCC及5 mg·kg-1 TCS+2 mg·kg-1 TCC处理对水稻土氮素的矿化-同化无显著影响,其余TCS和TCC处理均显著促进了氮的矿化-同化循环。此外,TCS和TCC处理显著降低了自养硝化速率、硝态氮的微生物固定速率以及硝酸盐异化还原成铵(Dissimilatory nitrate reduction to ammonium, DNRA)速率(2 mg·kg-1 TCS处理及5 mg·kg-1 TCS+2 mg·kg-1 TCC对DNRA速率无显著影响)。值得关注的是,TCS和TCC单一和联合处理均显著增加了N2O的累积排放量,其累积排放量为对照的1.13倍~1.44倍。本研究表明,TCS和TCC改变了水稻土好氧氮转化过程,可能对稻田生态系统氮循环产生不利影响;TCC和TCS对水稻土N2O排放的促进作用也增加了稻田生态系统对温室效应和臭氧层破坏的潜在贡献,因此,未来评价TCS和TCC土壤生态风险时,应考虑其对氮转化过程和N2O排放的潜在影响。
关键词:  三氯生  三氯卡班  15N示踪  数值模型  硝化  N2O
基金项目:中国科学院南京土壤研究所“一三五”计划和领域前沿项目(ISSASIP1653)和国家自然科学基金项目(41571289,21876207)共同资助
Influence of Triclosan and Triclocarban on Aerobic N Transformation and N2O Release in Paddy Soil
CHEN Shuntao1, ZHU Tongbin2, CHEN Jianqiu1, SHAN Jun3, YAN Xiaoyuan3
1.The School of Engineering, China Pharmaceutical University;2.Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, MLR and Guangxi;3.Institute of Soil Science, Chinese Academy of Sciences
Abstract:
【Objective】Triclosan (TCS) and triclocarban (TCC), are typical pharmaceutical and personal care products (PPCPs) that are extensively detected in soil, posing potential risks of raising soil microbes’ drug resistances and inhibiting soil respirations. However, so far little is known about their influences on soil gross N transformation processes and N2O emissions in soil. 【Method】 In view of this, an indoor incubation experiment was carried out using the 15N diluting-enriching method coupled with a N transformation numerical model to investigate influences of TCS and TCC, applied alone or in combination, at varying rates on preliminary N transformation rate and N2O release rate in paddy soil. 【Result】Results show that the treatment of applying 1 mg·kg-1 TCC or 5 mg·kg-1 TCS+2 mg·kg-1 TCC did not have much influence on N mineralization-assimilation in the paddy soil, but all the other treatments did quite reversely (P < 0.05). Besides, all the TCC and TCS treatments significantly inhibited autotrophic nitrification, microbial immobilization of nitrate and dissimilatory nitrate reduction to ammonium (Dissimilatory nitrate reduction to ammonium, DNRA), except for the treatment of applying 2 mg·kg-1 TCS or 5 mg·kg-1 TCS+2 mg·kg-1 TCC. It is noteworthy that all the treatments (P< 0.05) increased cumulative emission of N2O significantly or by 1.13~1.44 folds as compared with the control. 【Conclusion】All the findings in this study suggest that TCS and TCC alter aerobic N transformation processes, which may bring about adverse effects on N recycling in the paddy field ecosystem, and promote N2O emission, which may enhance the potential contribution of the paddy field ecosystem to greenhouse effect and damage of the ozone layer. Therefore, in evaluating soil ecological risks of TCS and TCC in future, it is essential to take into account their potential influences on N transformation and N2O emission.
Key words:  Triclosan  Triclocarban  15N-tracing  Numerical model  Nitrification  N2O