Chenying Wang , Qiuyue Xu , Yun Xia , Song Luo , Jinsong Wang , Liuming Yang , Zhijie Yang , Yusheng Yang , Yuexin Fan
{"title":"Divergent responses of soil plant-derived and microbial-derived C to phosphorus input in a Chinese fir plantation","authors":"Chenying Wang , Qiuyue Xu , Yun Xia , Song Luo , Jinsong Wang , Liuming Yang , Zhijie Yang , Yusheng Yang , Yuexin Fan","doi":"10.1016/j.geoderma.2025.117489","DOIUrl":null,"url":null,"abstract":"<div><div>Plant-derived and microbial-derived carbon (C) are key components of soil organic C (SOC), and their responses to phosphorus (P) availability and root-derived C, govern SOC dynamics, thereby influencing SOC fate. However, in P-limited regions, how P input affects SOC and its components and underlying mechanisms remain unclear. To address this, we conducted a P addition experiment (50 kg P ha<sup>−1</sup> yr<sup>−1</sup>) in a subtropical Chinese fir (<em>Cunninghamia lanceolata</em>) plantation, incorporating root and mycelium exclusion treatments. We investigated lignin phenols (biomarker for plant-derived C), amino sugars (biomarker for microbial-derived C), soil properties, microbial biomass, and extracellular enzyme activity. We found that 5 −years of P addition significantly decreased lignin phenols. This was due to reduced belowground C allocation and enhanced lignin decomposition (e.g., V- and S-type monomers). In contrast, P addition increased amino sugars by suppressing their enzymatic degradation and promoting conversion of plant-derived C to microbial derived C. In addition, root and hyphal exclusion negated the P-induced lignin decomposition, but did not affect amino sugar accumulation.<!--> <!-->This suggests that plant-derived C is greater sensitivity to P addition and stronger dependence on root-microbe interactions compared to microbial-derived C. These findings indicate that P addition alters SOC sources by reducing plant-derived C and increasing microbial-derived C, potentially enhancing SOC stability. This study elucidated how P availability regulates SOC and its component’s dynamics in P-limited ecosystems, providing mechanistic insights into the effects of P inputs on SOC storage, offering a theoretical basis for regional soil C management.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"461 ","pages":"Article 117489"},"PeriodicalIF":6.6000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geoderma","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0016706125003301","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"SOIL SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
Plant-derived and microbial-derived carbon (C) are key components of soil organic C (SOC), and their responses to phosphorus (P) availability and root-derived C, govern SOC dynamics, thereby influencing SOC fate. However, in P-limited regions, how P input affects SOC and its components and underlying mechanisms remain unclear. To address this, we conducted a P addition experiment (50 kg P ha−1 yr−1) in a subtropical Chinese fir (Cunninghamia lanceolata) plantation, incorporating root and mycelium exclusion treatments. We investigated lignin phenols (biomarker for plant-derived C), amino sugars (biomarker for microbial-derived C), soil properties, microbial biomass, and extracellular enzyme activity. We found that 5 −years of P addition significantly decreased lignin phenols. This was due to reduced belowground C allocation and enhanced lignin decomposition (e.g., V- and S-type monomers). In contrast, P addition increased amino sugars by suppressing their enzymatic degradation and promoting conversion of plant-derived C to microbial derived C. In addition, root and hyphal exclusion negated the P-induced lignin decomposition, but did not affect amino sugar accumulation. This suggests that plant-derived C is greater sensitivity to P addition and stronger dependence on root-microbe interactions compared to microbial-derived C. These findings indicate that P addition alters SOC sources by reducing plant-derived C and increasing microbial-derived C, potentially enhancing SOC stability. This study elucidated how P availability regulates SOC and its component’s dynamics in P-limited ecosystems, providing mechanistic insights into the effects of P inputs on SOC storage, offering a theoretical basis for regional soil C management.
植物源碳和微生物源碳是土壤有机碳的关键组成部分,它们对磷有效性和根源碳的响应控制着土壤有机碳的动态,从而影响土壤有机碳的命运。然而,在磷限制地区,磷输入如何影响有机碳及其组成和潜在机制尚不清楚。为了解决这一问题,我们在亚热带杉木(Cunninghamia lanceolata)人工林进行了加磷试验(50 kg P / h−1年−1年),包括根和菌丝体排除处理。我们研究了木质素酚(植物源性C的生物标志物)、氨基糖(微生物源性C的生物标志物)、土壤特性、微生物生物量和细胞外酶活性。我们发现添加磷5−年显著降低木质素酚。这是由于减少了地下C分配和增强木质素分解(例如,V型和s型单体)。相比之下,P的添加通过抑制氨基糖的酶降解和促进植物源C向微生物源C的转化而增加了氨基糖。此外,根和菌丝的排除否定了P诱导的木质素分解,但不影响氨基糖的积累。这表明,与微生物源碳相比,植物源碳对磷添加更敏感,对根-微生物相互作用的依赖性更强。这些发现表明,磷添加通过减少植物源碳和增加微生物源碳来改变有机碳来源,从而可能增强有机碳的稳定性。本研究阐明了磷有效度对磷限制生态系统有机碳及其组分动态的调控机制,为磷输入对有机碳储量的影响提供了机制见解,为区域土壤C管理提供了理论依据。
期刊介绍:
Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.