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首页> 外文期刊>Global Biogeochemical Cycles >Can N_2O stable isotopes and isotopomers be useful tools to characterize sources and microbial pathways of N_2O production and consumption in tropical soils?
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Can N_2O stable isotopes and isotopomers be useful tools to characterize sources and microbial pathways of N_2O production and consumption in tropical soils?

机译：N_2O稳定同位素和同位素异构体是否可以用作表征热带土壤中N_2O生产和消费的来源和微生物途径的有用工具？

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摘要

Nitrous oxide (N_2O) is an important greenhouse gas in which the main sources are tropical rainforest and agricultural soils. N_2O is produced in soils by microbial processes, which are enhanced by the application of nitrogenous fertilizers. The soil N_2O bulk isotopic composition (δ~(15)Nbulk and δ~(18)O) and the "site-specific," or intramolecular, ~(15)N isotopic composition, i.e., the 15N/14N ratio at the cenral or terminal nitrogen position, expressed in this study as δ~(15)N and δ~(15)N could help identify both the sources (natural and anthropogenic) and microbial pathways of N_2O production and consumption prior to emission.We report new isotope measurements of soil N 2O emissions and from soil air collected during the rainy season in a mature tropical forest (Tapajos National Forest, Para, Brazil) and in a tropical agricultural corn field ("Fundo Tierra Nueva," Gurico State, Venezuela). The statistically different δ~(15)Nbulk emission weighted average between the mature forest (-18.0‰ 4.0‰, n = 6) and agricultural corn field (-34.3‰ 12.4‰, n = 17) suggest that the δ~(15)Nbulk data are useful for distinguishing N_2O fluxes from fertilized agricultural and natural "background" soils. They also demonstrate that the site-specific δ~(15)N measurements have the potential to provide a new tool to differentiate between the production and consumption N_2O microbiological processes in soils. This study further demonstrates that the observed correlations (or lack thereof) between δ~(15)N, δ~(15)N, and δ~(18)O can be used to estimate the relative proportion of N_2O that would have been emitted to the air but was consumed via reduction of N_2O to N_2 within the soil.
机译：一氧化二氮（N_2O）是一种重要的温室气体，其主要来源是热带雨林和农业土壤。 N_2O是通过微生物过程在土壤中产生的，而氮肥的施用会增强这种作用。土壤N_2O的整体同位素组成（δ〜（15）Nbulk和δ〜（18）O）和“特定位置”或分子内的〜（15）N同位素组成，即中心处的15N / 14N比或最终氮位置，在本研究中表示为δ〜（15）N和δ〜（15）N可以帮助识别排放前N_2O产生和消耗的来源（自然的和人为的）和微生物途径。我们报告了新的同位素测量成熟热带森林（巴西帕拉的塔帕霍斯国家森林）和热带农业玉米田（委内瑞拉古里科州的“ Fundo Tierra Nueva”）在雨季收集的土壤N 2O排放量和土壤空气中的N 2 O排放量。在成熟森林（-18.0‰4.0‰，n = 6）和农业玉米田（-34.3‰12.4‰，n = 17）之间具有统计学差异的δ〜（15）散装排放加权平均值表明δ〜（15） Nbulk数据可用于区分施肥的农业土壤和自然“背景”土壤中的N_2O通量。他们还证明了特定位置的δ〜（15）N测量值有可能为区分土壤中N_2O生产过程和消耗过程的新工具提供新的工具。这项研究进一步证明了δ〜（15）N，δ〜（15）N和δ〜（18）O之间观察到的相关性（或缺乏相关性）可用于估算本应排放的N_2O的相对比例通过空气中的N_2O还原为N_2而被消耗掉。

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