Interactive effects of plant litter chemistry and organic/inorganic forms of nitrogen addition on Moso bamboo (Phyllostachys edulis) soil respiration

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE
Shoujia Zhuo, Yunying Fang, Youchao Chen, Tony Vancov, Huaqiang Du, Yongfu Li, Bing Yu, Scott X. Chang, Yanjiang Cai
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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.

Abstract Image

植物废弃物化学性质和有机/无机氮添加形式对毛竹(Phyllostachys edulis)土壤呼吸作用的交互影响
植物废弃物对土壤碳(C)循环的影响受到外部氮(N)沉积和植物废弃物化学性质的影响。以往的研究主要集中于无机氮沉积及其对植物枯落物分解和土壤碳循环的影响,而对有机氮的影响仍知之甚少。在这项研究中,我们进行了一项为期 180 天的培养实验,以研究不同的氮形式(NH4NO3、50% 尿素 + 50% 甘氨酸)和枯落物化学(不同的木质素/N 比率)如何影响酸性毛竹林土壤的二氧化碳排放。我们的研究结果表明,凋落物的添加增加了土壤的二氧化碳排放量以及二氧化碳-C 占总 C 的比例(将添加的凋落物-C 视为总 C 的一部分)。具体来说,木质素/氮比率较低的毛竹落叶会导致较高的土壤二氧化碳排放量和二氧化碳-碳/总碳比率。这种拮抗作用归因于氮的添加引起了土壤酸化,从而抑制了微生物的活动,降低了因添加枯落物而促进的土壤呼吸作用。随机森林分析和偏最小二乘路径模型证实了这种效应,进一步确定了土壤溶解有机碳和 pH 值是对土壤二氧化碳排放产生积极影响的关键因素。总之,我们的研究表明,大气中的氮沉积可以缓解枯落物引起的土壤二氧化碳排放,特别是在无机氮形式下和引入高木质素/氮比的叶片枯落物时。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
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.
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