Changes in soil microbial communities induced by warming and N deposition accelerate the CO2 emissions of coarse woody debris

doi:10.1007/s11676-022-01544-8

Abstract

Abstract:

Warming and nitrogen (N) deposition are two important drivers of global climate changes. Coarse woody debris (CWD) contains a large proportion of the carbon (C) in the total global C pool. The composition of soil microbial communities and environmental changes (i.e., N deposition and warming) are the key drivers of CWD decomposition, but the interactive impact between N deposition and warming on the composition of soil microbial communities and CWD decomposition is still unclear. In a laboratory experiment, we study and simulate respiration during decomposition of the CWD (C₉₈) of Cryptomeria japonica (CR) and Platycarya strobilacea (PL) in response to warming and N deposition over 98 days. Resuts show that either warming or N addition significantly accelerated the C₉₈ of the two tree species by altering the soil microbial community (bacterial:fungi and G⁺:G^–). The combined treatment (warming + N) resulted in a decomposition effect equal to the sum of the individual effects. In addition, the species composition of bacteria and fungi was obviously affected by warming. However, N deposition had a remarkable influence on G⁺:G^–. Our results indicated that N deposition and warming will observably alter the composition and growth of the microbial community and thus work synergistically to accelerate CWD decomposition in forest ecosystems. We also present evidence that N deposition and warming influenced the composition and balance of soil microbial communities and biogeochemical cycling of forest ecosystems.

Key words: Warming, N deposition, Coarse woody debris, Decomposition, Soil microbial community

Hankun Wang, Chunsheng Wu, Junping Liu, Qi Chen, Chao Li, Chunjie Shu, Yi Zhang, Yuanqiu Liu. Changes in soil microbial communities induced by warming and N deposition accelerate the CO₂ emissions of coarse woody debris[J]. JOURNAL OF FORESTRY RESEARCH, 2023, 34(4): 1051-1063.

Hankun Wang, Chunsheng Wu, Junping Liu, Qi Chen, Chao Li, Chunjie Shu, Yi Zhang, Yuanqiu Liu. [J]. 林业研究(英文版), 2023, 34(4): 1051-1063.

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Changes in soil microbial communities induced by warming and N deposition accelerate the CO₂ emissions of coarse woody debris

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