期刊论文

Consumption Capacity of N_2O in Paddy Soil and the Response Mechanism of nosZ-I-containing Communities

Liu, Yi(liuyi@isa.ac.cn)

中文

环境科学

0250-3301

2020

41

4

1968-1975

10.13227/j.hjkx.201908220

41771300:国家自然科学基金 41301274:国家自然科学基金 2017QNCXTD_GTD:中国科学院亚热带农业生态研究所青年创新团队项目

本校为其他机构

稻田土壤长期的淹水厌氧环境有利于反硝化作用的进行,是导致N_2O大量排放的重要原因之一.目前,关于稻田土壤N_2O排放特征的相关研究已有不少,然而关于稻田土壤N_2O的消纳能力及相关功能微生物的应答机制尚不明确.本研究以淹水水稻土原状土柱( 0 ~ 5 cm)为研究对象,在土柱底部输入外源N_2O气体,系统监测所添加外源N_2O通过土柱的浓度及关键土壤因子的动态变化特征,以及分析nosZ-I型功能种群组成的演替规律,以期揭示淹水水稻土N_2O的消纳能力及nosZ-I型功能种群的应答机制.结果表明,外源N_2O输入后约97.39%扩散进入土柱,逸散出土表的N_2O占0.72%~ 7.75%,达到排放高峰后被土壤继续消耗,培养192 h后...

The long-term flooding anaerobic environment in paddy soils is conducive to denitrification, which is one of the most important reasons for N2O emissions. N2O can be transformed to nitrogen gas (N2) by bacteria and archaea containing nitrous oxide reductase (N2OR) encoded by the nosZ gene, which is the only known biological pathway of N2O consumption in soil. nosZ-I is known to be typical in denitrifying bacteria, which is one of the clades of the nosZ gene and is mainly possessed a Tat signal peptide motif. Although many researchers have studi...