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soil carbon Dynamics Under changing climate A Research Transition from Absolute to Relative Roles of Inorganic Nitrogen Pools and Associated Microbial Processes:A Review

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Pedosphere 2017年第5期27卷 792-806页

作者： pratap srivastava rishikesh singh sachchidanand tripathi pardeep singh shikha singh hema singh akhilesh singh raghubanshi pradeep kumar mishra department of chemical engineering and technology indian institute of technologybanaras hindu universityVaranasi 221005(India) institute of environment&sustainable development(iesd) banaras hindu universityVaranasi 221005(India) department of botany deen dayal upadhyaya collegeuniversity of delhiNew Delhi 110015(India) department of environmental studies pannalal girdharlal dayanand anglo-vedic collegeuniversity of delhiNew Delhi 110065(India) ecosystems analysis laboratory department of botanyinstitute of sciencebanaras hindu universityVaranasi 221005(India)

It is globally accepted that soil carbon （c） dynamics are at the core of interlinked environmental problems, deteriorating soil quality and changing climate. Its management remains a complex enigma for the scientific community due to its intricate relationship with soil nitrogen （N） availability and moisture-temperature interactions. This article reviews the management aspects of soil c dynamics in light of recent advances, particularly in relation to the availability of inorganic N pools and associated microbial processes under changing climate. Globally, drastic alterations in soil c dynamics under changing land use and management practices have been primarily attributed to the variation in soil N availability, resulting in a higher decomposition rate and a considerable decline in soil organic c （SOc） levels due to increased soil cO2 emissions, degraded soil quality, and increased atmospheric cO2 concentrations, leading to climate warming. Predicted climate warming is proposed to enhance SOc decomposition, which may further increase soil N availability, leading to higher soil cO2 effiux. However, a literature survey revealed that soil may also act as a potential c sink, if we could manage soil inorganic N pools and link microbial processes properly. Studies also indicated that the relative, rather than the absolute, availability of inorganic N pools might be of key importance under changing climate, as these N pools are variably affected by moisture-temperature interactions, and they have variable impacts on SOc turnover. Therefore, multi-factorial studies are required to understand how the relative availability of inorganic N pools and associated microbial processes may determine SOc dynamics for improved soil c management.

关键词： agro-management immobilization NH4+-N to NO3-N ratio nitrification relative availability soil c02 effiux

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