Effects of Enhanced UV-B Radiation on Greenhouse Gas Emissions in Terrestrial Ecosystem: Research Progress

doi:10.11924/j.issn.1000-6850.casb2021-1209

Abstract

Abstract:

Ultraviolet-B (UV-B, 280-320 nm) radiation enhancement and climate change are critical global environmental issues. The depletion of the stratospheric ozone layer and the increase of greenhouse gases (GHGs, e.g. CO₂, CH₄ and N₂O) emissions are major factors driving these issues. Enhanced UV-B radiation would affect carbon and nitrogen balance of terrestrial ecosystem through a series of biogeochemical processes, and influence the emission of GHGs to the atmosphere, further impact the global climate change. In this paper, we systematically reviewed the effect of enhanced UV-B radiation on CO₂ emissions in terrestrial ecosystems through litter or soil and the mechanisms involved in these processes (photochemical degradation of recalcitrant organic molecules into soluble organic carbon, abiotic photo-mineralization of organic compounds and photo-induced microbial degradation). Besides, the influence of enhanced UV-B radiation on CH₄ and N₂O emissions (through changes in the chemical structure of plant tissue and the composition of root exudate) were summarized. The emission patterns of CH₄ and N₂O under the interaction of UV-B radiation enhancement and other environmental factors in different ecosystems were also discussed. In addition, the elevated temperature and reduced precipitation could promote photodegradation of organic matter induced by UV-B radiation enhancement, and further increase GHGs emissions. At present, studies regarding the effects of UV-B radiation enhancement on terrestrial ecosystem are still limited, while most of which focus on arid ecosystems and there are few quantitative studies. In the future, more long-term and large-scale field studies combining with models are needed to quantify the contribution of enhanced UV-B radiation to greenhouse gas emissions in terrestrial ecosystem. The study will provide theoretical reference for the accurate prediction of GHGs emissions under global environment change scenario.

Key words: UV-B radiation, terrestrial ecosystem, greenhouse gas emissions, photodegradation

CLC Number:

S181

CHENG Lu, WEN Yongli, CHENG Man. Effects of Enhanced UV-B Radiation on Greenhouse Gas Emissions in Terrestrial Ecosystem: Research Progress[J]. Chinese Agricultural Science Bulletin, 2022, 38(33): 80-88.

Figures/Tables 1

References 89

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