Yongkang Ji, Nan Ma, Petr Heděnec, Yan Peng, Kai Yue, Jianxiao Zhu, Hui Zhang, Junjiong Shao, Lita Yi, Cuihuan Li, Qiqian Wu, Yan Li
{"title":"季节性降水制度对亚热带森林土壤氮转化的影响：来自操纵实验的见解","authors":"Yongkang Ji, Nan Ma, Petr Heděnec, Yan Peng, Kai Yue, Jianxiao Zhu, Hui Zhang, Junjiong Shao, Lita Yi, Cuihuan Li, Qiqian Wu, Yan Li","doi":"10.1007/s11104-025-07311-y","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Background and aims</h3><p>Seasonal precipitation regimes can affect soil nitrogen (N) transformation rates, yet the underlying driving factors remain poorly studied.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>To address this knowledge gap, we conducted a precipitation manipulation experiment in a subtropical forest in China from 2020 to 2022. We utilized the in situ resin-core method to assess soil physicochemical properties, microbial biomass, net nitrification rate (<i>N</i><sub>nit</sub>) and net N mineralization rate (<i>N</i><sub>min</sub>) under three treatments: control (CK), decreased precipitation by 50% during the dry season with extremely increased precipitation (≥ 50 mm) during the wet season (IE) and decreased precipitation by 50% during the dry season with proportionally increased precipitation (≤ 20 mm) during the wet season (IP).</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>IE and IP significantly decreased <i>N</i><sub>nit</sub> (57.9% and 72.5%, respectively) and <i>N</i><sub>min</sub> (82.5% and 89.6%, respectively) during the dry season. However, the results were reversed during the wet season (increased by 64.3% and 79.5% and by 64.2% and 81.1%, respectively), and the effects of IP were significantly stronger than those of IE. Structural equation modeling indicated that seasonal precipitation regimes significantly affected <i>N</i><sub>nit</sub> and <i>N</i><sub>min</sub> by changing soil water content, NH<sub>4</sub><sup>+</sup>-N, microbial biomass N and soil C:N ratio. Moreover, <i>N</i><sub>nit</sub> and <i>N</i><sub>min</sub> were mainly influenced by soil physicochemical properties during the dry season, whereas microbial biomass played a more important role during the wet season.</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>Seasonal precipitation regimes can significantly affect <i>N</i><sub>nit</sub> and <i>N</i><sub>min</sub> in forest ecosystems, with the magnitude of these effects varying depending on the specific form of the seasonal precipitation regime. </p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":"31 1","pages":""},"PeriodicalIF":4.1000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Impact of seasonal precipitation regimes on soil nitrogen transformation in a subtropical forest: Insights from a manipulation experiment\",\"authors\":\"Yongkang Ji, Nan Ma, Petr Heděnec, Yan Peng, Kai Yue, Jianxiao Zhu, Hui Zhang, Junjiong Shao, Lita Yi, Cuihuan Li, Qiqian Wu, Yan Li\",\"doi\":\"10.1007/s11104-025-07311-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Background and aims</h3><p>Seasonal precipitation regimes can affect soil nitrogen (N) transformation rates, yet the underlying driving factors remain poorly studied.</p><h3 data-test=\\\"abstract-sub-heading\\\">Methods</h3><p>To address this knowledge gap, we conducted a precipitation manipulation experiment in a subtropical forest in China from 2020 to 2022. We utilized the in situ resin-core method to assess soil physicochemical properties, microbial biomass, net nitrification rate (<i>N</i><sub>nit</sub>) and net N mineralization rate (<i>N</i><sub>min</sub>) under three treatments: control (CK), decreased precipitation by 50% during the dry season with extremely increased precipitation (≥ 50 mm) during the wet season (IE) and decreased precipitation by 50% during the dry season with proportionally increased precipitation (≤ 20 mm) during the wet season (IP).</p><h3 data-test=\\\"abstract-sub-heading\\\">Results</h3><p>IE and IP significantly decreased <i>N</i><sub>nit</sub> (57.9% and 72.5%, respectively) and <i>N</i><sub>min</sub> (82.5% and 89.6%, respectively) during the dry season. However, the results were reversed during the wet season (increased by 64.3% and 79.5% and by 64.2% and 81.1%, respectively), and the effects of IP were significantly stronger than those of IE. Structural equation modeling indicated that seasonal precipitation regimes significantly affected <i>N</i><sub>nit</sub> and <i>N</i><sub>min</sub> by changing soil water content, NH<sub>4</sub><sup>+</sup>-N, microbial biomass N and soil C:N ratio. 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Impact of seasonal precipitation regimes on soil nitrogen transformation in a subtropical forest: Insights from a manipulation experiment
Background and aims
Seasonal precipitation regimes can affect soil nitrogen (N) transformation rates, yet the underlying driving factors remain poorly studied.
Methods
To address this knowledge gap, we conducted a precipitation manipulation experiment in a subtropical forest in China from 2020 to 2022. We utilized the in situ resin-core method to assess soil physicochemical properties, microbial biomass, net nitrification rate (Nnit) and net N mineralization rate (Nmin) under three treatments: control (CK), decreased precipitation by 50% during the dry season with extremely increased precipitation (≥ 50 mm) during the wet season (IE) and decreased precipitation by 50% during the dry season with proportionally increased precipitation (≤ 20 mm) during the wet season (IP).
Results
IE and IP significantly decreased Nnit (57.9% and 72.5%, respectively) and Nmin (82.5% and 89.6%, respectively) during the dry season. However, the results were reversed during the wet season (increased by 64.3% and 79.5% and by 64.2% and 81.1%, respectively), and the effects of IP were significantly stronger than those of IE. Structural equation modeling indicated that seasonal precipitation regimes significantly affected Nnit and Nmin by changing soil water content, NH4+-N, microbial biomass N and soil C:N ratio. Moreover, Nnit and Nmin were mainly influenced by soil physicochemical properties during the dry season, whereas microbial biomass played a more important role during the wet season.
Conclusions
Seasonal precipitation regimes can significantly affect Nnit and Nmin in forest ecosystems, with the magnitude of these effects varying depending on the specific form of the seasonal precipitation regime.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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