Shoujia Zhuo, Yunying Fang, Youchao Chen, Tony Vancov, Huaqiang Du, Yongfu Li, Bing Yu, Scott X. Chang, Yanjiang Cai
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引用次数: 0
Abstract
The impact of plant litter on soil carbon (C) cycling is influenced by external nitrogen (N) deposition and plant litter chemistry. While previous research has mainly focused on inorganic N deposition and its effect on plant litter decomposition and soil C cycling, the influence of organic N remains poorly understood. In this study, we conducted a 180-day incubation experiment to investigate how different N forms (NH4NO3, Urea 50% + Glycine 50%) and litter chemistry (varying lignin/N ratios) affect CO2 emissions from an acidic Moso bamboo (Phyllostachys edulis) forest soil. Our findings indicate that litter addition increased soil CO2 emissions and the proportion of CO2-C to Total C (considering added litter-C as a part of total C). Specifically, Moso bamboo leaf litter with a lower lignin/N ratio led to higher soil CO2 emissions and CO2-C/Total C ratios. The combined addition of litter and N exhibited an antagonistic effect on soil CO2 emissions, with inorganic N having a more pronounced effect compared to organic N. This antagonistic effect was attributed to the N addition-induced soil acidification, thereby inhibiting microbial activities and reducing soil respiration promoted by litter input. This effect was confirmed by random forest analysis and partial least squares path modeling, which further identified soil dissolved organic C and pH as critical factors positively influencing soil CO2 emissions. Overall, our study suggests that atmospheric N deposition can mitigate litter-induced soil CO2 emissions, particularly under inorganic N forms and when leaf litters with high lignin/N ratios are introduced.
期刊介绍:
Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.