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Microbial processes responsible for soil N2O production in a tropical rainforest, illustrated using an in situ 15N labeling approach 

 
论文编号:
作者: Zhou WJ; Xi D
刊物名称: Catena
所属学科:
论文题目英文: Microbial processes responsible for soil N2O production in a tropical rainforest, illustrated using an in situ 15N labeling approach
年: Jul 2021
卷: 202
期:
页: 105214
联系作者: Zhang YP
收录类别:
影响因子: 4.333
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摘要:

Tropical forests are important contributors for N2O emissions from soil to the atmosphere; however, the microbial processes responsible for soil N2O production in tropical forest soils remain unclear. In this study, we employed a 40-day-long in situ 15NO3- labeling experiment to determine the microbial processes that are responsible for N2O production in an undisturbed tropical rainforest in Xishuangbanna, southwest China. We observed that during the experiment, most of the 15N-labeled NO3- were immobilized and only 0.027% was emitted as N2O. Of the total N2O production, 3.1% was from the added 15N-labeled NO3-, 48.6% was from the added NH4+ and native N. Within the first 27 h, nitrification (heterotrophic and autotrophic nitrification) was the predominant microbial process of N2O production, accounting for 97.6% of total soil N2O emissions, whereas denitrification and co-denitrification resulted in only 1.6% and 0.9% emissions, respectively. To the best of our knowledge, this is the first study to demonstrate that nitrification, rather than denitrification, is the predominant microbial process of N2O production in situ in the study area in the tropical forest.

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