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Nitrous oxide emissions from soils: how well do we understand the processes and their controls?

环境科学 土壤水分 生物地球化学循环 生态系统 根际 陆地生态系统 生态学 地球科学 土壤科学 生物 遗传学 地质学 细菌
作者
Klaus Butterbach-Bahl,Elizabeth M. Baggs,Michael Dannenmann,Ralf Kiese,Sophie Zechmeister-Boltenstern
出处
期刊:Philosophical Transactions of the Royal Society B [The Royal Society]
卷期号:368 (1621): 20130122-20130122 被引量:1656
标识
DOI:10.1098/rstb.2013.0122
摘要

Although it is well established that soils are the dominating source for atmospheric nitrous oxide (N2O), we are still struggling to fully understand the complexity of the underlying microbial production and consumption processes and the links to biotic (e.g. inter- and intraspecies competition, food webs, plant-microbe interaction) and abiotic (e.g. soil climate, physics and chemistry) factors. Recent work shows that a better understanding of the composition and diversity of the microbial community across a variety of soils in different climates and under different land use, as well as plant-microbe interactions in the rhizosphere, may provide a key to better understand the variability of N2O fluxes at the soil-atmosphere interface. Moreover, recent insights into the regulation of the reduction of N2O to dinitrogen (N2) have increased our understanding of N2O exchange. This improved process understanding, building on the increased use of isotope tracing techniques and metagenomics, needs to go along with improvements in measurement techniques for N2O (and N2) emission in order to obtain robust field and laboratory datasets for different ecosystem types. Advances in both fields are currently used to improve process descriptions in biogeochemical models, which may eventually be used not only to test our current process understanding from the microsite to the field level, but also used as tools for up-scaling emissions to landscapes and regions and to explore feedbacks of soil N2O emissions to changes in environmental conditions, land management and land use.
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