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Research Progress on Effects of Nitrogen and Phosphorus Addition on Soil Respiration: Bibliometric Mapping Analysis and Systematic Review of Publications in Global Core Journals (2015 to 2025)
YANGSiyu, HUMinghang, TONGLingchen, HANYanying, YEYanhui
Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (16) : 157-169.
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Abbreviation (ISO4): Chin Agric Sci Bull
Editor in chief: Yulong YIN
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Research Progress on Effects of Nitrogen and Phosphorus Addition on Soil Respiration: Bibliometric Mapping Analysis and Systematic Review of Publications in Global Core Journals (2015 to 2025)
To comprehensively and systematically trace the research development trajectory in the field of nitrogen and phosphorus addition effects on soil respiration, accurately grasp the current status and frontier dynamics, and provide scientific support for future research planning and practical decision-making, this study selected the Web of Science core collection as the data source for literature retrieval, setting the search period from January 1, 2015, to December 31, 2025. Using bibliometric methods, we conducted visual analysis on 402 core publications, examining annual publication trends, journals, research institutions, author groups, keyword co-occurrence patterns, and thematic evolution, thereby constructing a high-resolution knowledge map of the field. The results showed that global annual publication growth averaged 10.6%, with a slight decline in output between 2023 and 2024, yet remaining above earlier baseline levels. The journal Soil Biology & Biochemistry ranked first in publishing related papers. ZHU Biao (with 12 publications and 982 cumulative citations) and Marie Spohn formed two highly productive and influential research groups. China led globally in both total publications (191) and citations (5999), driven primarily by large-scale networked controlled experiments. The United States and Germany produced numerous highly cited papers, establishing mainstream theoretical frameworks in the field. Keyword evolution had progressed through three stages: single-nutrient factor studies, microbial mechanism exploration, and integrated multi-system analyses. The co-occurrence strength of the keywords “phosphorus addition” and “microbial respiration” increased by 5.5 times over five years. Future research should address data gaps in tropical, permafrost, and urban greenland ecosystems, integrate high-throughput sensing technologies and multi-omics approaches, develop nonlinear models linking nitrogen-to-phosphorus ratios, microbial carbon use efficiency, and soil respiration responses, and establish a global specialized literature database to support carbon neutrality goals and accurate soil carbon stock accounting.
nitrogen and phosphorus addition / soil respiration / bibliometric analysis / visual analytics / CiteSpace
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土壤微生物生物量在森林生态系统中充当具有生物活性的养分积累和储存库。土壤微生物转化有机质为植物提供可利用养分, 与植物的相互作用维系着陆地生态系统的生态功能。同时, 土壤微生物也与植物争夺营养元素, 在季节交替过程和植物的生长周期中呈现出复杂的互利-竞争关系。综合全球数据对温带、亚热带和热带森林土壤微生物生物量碳(C)、氮(N)、磷(P)含量及其化学计量比值的季节动态进行分析, 发现温带和亚热带森林的土壤微生物生物量C、N、P含量均呈现夏季低、冬季高的格局。热带森林四季的土壤微生物生物量C、N、P含量都低于温带和亚热带森林, 且热带森林土壤微生物生物量C含量、N含量在秋季相对最低, 土壤微生物生物量P含量四季都相对恒定。温带森林的土壤微生物生物量C:N在春季显著高于其他两个森林类型; 热带森林的土壤微生物生物量C:N在秋季显著高于其他2个森林类型。温带森林土壤微生物生物量N:P和C:P在四季都保持相对恒定, 而热带森林土壤微生物生物量N:P和C:P在夏季高于其他3个季节。阔叶树的土壤微生物生物量C含量、N含量、N:P、C:P在四季都显著高于针叶树; 而针叶树的土壤微生物生物量P含量在四季都显著高于阔叶树。在春季和冬季时, 土壤微生物生物量C:N在阔叶树和针叶树之间都没有显著差异; 但是在夏季和秋季, 针叶树的土壤微生物生物量C:N显著高于阔叶树。对于土壤微生物生物量的变化来说, 森林类型是主要的显著影响因子, 季节不是显著影响因子, 暗示土壤微生物生物量的季节波动是随着植物其内在固有的周期变化而变化。植物和土壤微生物密切作用表现出来的对养分的不同步吸收是保留养分和维持生态功能的一种权衡机制。
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Nitrogen (N) enrichment is an element of global change that could influence the growth and abundance of many organisms. In this meta-analysis, I synthesized responses of microbial biomass to N additions in 82 published field studies. I hypothesized that the biomass of fungi, bacteria or the microbial community as a whole would be altered under N additions. I also predicted that changes in biomass would parallel changes in soil CO2 emissions. Microbial biomass declined 15% on average under N fertilization, but fungi and bacteria were not significantly altered in studies that examined each group separately. Moreover, declines in abundance of microbes and fungi were more evident in studies of longer durations and with higher total amounts of N added. In addition, responses of microbial biomass to N fertilization were significantly correlated with responses of soil CO2 emissions. There were no significant effects of biomes, fertilizer types, ambient N deposition rates or methods of measuring biomass. Altogether, these results suggest that N enrichment could reduce microbial biomass in many ecosystems, with corresponding declines in soil CO2 emissions.
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