Abstract
Purpose
Denitrification has been extensively studied in soils from temperate zones in industrialized countries. However, few studies quantifying denitrification rates in soils from tropical and subtropical zones have been reported. Denitrification mechanisms in tropical/subtropical soils may be different from other soils due to their unique soil characteristics. The identification of denitrification in the area is crucial to understand the role of denitrification in the global nitrogen (N) cycle in terrestrial ecosystems and in the interaction between global environmental changes and ecosystem responses.
Materials and methods
We review the existing literature on microbially mediated denitrification in tropical/subtropical soils, attempting to provide a better understanding about and new research directions for denitrification in these regions.
Results and discussion
Tropical and subtropical soils might be characterized by generally lower denitrification capacity than temperate soils, with greater variability due to land use and management practices varying temporally and spatially. Factors that influence soil water content and the nature and rate of carbon (C) and N turnover are the landscape-scale and field-scale controls of denitrification. High redox potential in the field, which is mainly attributed to soil oxide enrichment, may be at least one critical edaphic variable responsible for slow denitrification rates in the humid tropical and subtropical soils. However, soil pH is not responsible for these slow denitrification rates. Organic C mineralization is more important than total N content and C/N in determining denitrification capacity in humid subtropical soils. There is increasing evidence that the ecological consequence of denitrification in tropical and subtropical soils may be different from that of temperate zones. Contribution of denitrification in tropical and subtropical regions to the global climate warming should be considered comprehensively since it could affect other greenhouse gases, such as methane (CH4) and carbon dioxide (CO2), and N deposition.
Conclusions
Tropical/subtropical soils have developed several N conservation strategies to prevent N losses via denitrification from the ecosystems. However, the mechanisms involved in the biogeochemical regulation of tropical and subtropical ecosystem responses to environmental changes are largely unknown. These works are important for accurately modeling denitrification and all other simultaneously operating N transformations.
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Acknowledgments
The project was financially supported by the Australian Research Council (DP1092470), the National Natural Science Foundation of China (31101605 and 31260503), the Research Foundation of State Key Laboratory of Soil and Sustainable Agriculture, Chinese Academy of Sciences (0812000051), and the Natural Science Foundation of Yunnan Province (2010ZC083).
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Xu, Y., Xu, Z., Cai, Z. et al. Review of denitrification in tropical and subtropical soils of terrestrial ecosystems. J Soils Sediments 13, 699–710 (2013). https://doi.org/10.1007/s11368-013-0650-1
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DOI: https://doi.org/10.1007/s11368-013-0650-1