Mechanisms underlying soil microbial regulation of available phosphorus in a temperate forest exposed to long-term nitrogen addition

Wang, Shiqi; Song, Minghua; Wang, Chunmei; Dou, Xiaomin; Wang, Xinqing; Li, Xingyue

doi:10.1016/j.scitotenv.2023.166403

Cited by 3 publications

(3 citation statements)

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“…In this study, genes encoding the formation of acetic acid and gluconic acid (e.g., aldh 2 , gcd) had a relatively high abundance, with both heavy and moderate thinning showing significant increases compared to weak thinning (p < 0.05). Therefore, we speculate that appropriately increasing the thinning intensity can favor the synthesis of organic acids, which can potentially increase the supply of soil phosphorus [38].…”

Section: Shifts In the Functional Genes Of Soil Phosphorus Cycling Af...mentioning

confidence: 98%

“…In addition, our findings suggest that the increase in ammonium nitrogen content can also be associated with an increase in soil nitrogen availability (Table S5). For instance, Wang et al [38] reported that ammonium nitrogen could genetically enhance the mineralization of organic phosphorus, thereby affecting soil phosphorus effectiveness, through long-term nitrogen additions in temperate forests. Khan et al [39] also observed that an increase in soil NH 4 + could lead to an increase in soil H + content by rapid oxidation to HNO 3 via nitrification and by competing with cationic ions for adsorption sites.…”

Section: Effects Of Different Thinning Intensities On Soil Phosphorus...mentioning

confidence: 99%

“…Among the detected phosphorus cycling genes, the gene encoding PQQ-GDH enzyme (e.g., gcd) showed a significantly higher relative abundance under heavy thinning compared to moderate and weak thinning. Given that PQQ-GDH contributes significantly to the solubilization of soil inorganic phosphorus into AP [29,42], this can be one of the important pathways for enhancing soil phosphorus availability [38]. Furthermore, soil organic acid content greatly influences the solubilization of inorganic phosphorus [17,43].…”

Section: Shifts In the Functional Genes Of Soil Phosphorus Cycling Af...mentioning

confidence: 99%

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Responses of Soil Phosphorus Cycling-Related Microbial Genes to Thinning Intensity in Cunninghamia lanceolata Plantations

Ma,

Wang,

Chen

et al. 2024

Forests

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Background: Microorganisms are important regulators of soil phosphorus cycling and phosphorus availability in Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) plantations. However, the effects of thinning on soil phosphorus cycling by microbes in C. lanceolata plantations remain unclear. Methods: We performed a metagenomic sequencing analysis to investigate how thinning intensities (weak, moderate, and heavy) alter phosphorus cycling related microbial genes and their regulatory effects on soil phosphorus availability in C. lanceolata plantations. Results: Following heavy thinning, the contents of available and labile phosphorus increased by 13.8% and 36.9%, respectively, compared to moderate and weak thinning. Moreover, the relative abundance of genes associated with inorganic phosphorus solubilization increased significantly with the increase in thinning intensity, whereas genes associated with phosphorus uptake and transport significantly decreased. The metagenomic analysis results indicate that Acidobacteria (47.6%–53.5%), Proteobacteria (17.9%–19.1%), and Actinobacteria (11.7%–12.8%) are the major contributors to the functional phosphorus cycling genes in the soil. The random forest analysis results suggested that gcd, plc, phoN, ugpA, and phoR were the critical genes involved in the transformation and use of phosphorus, which in turn increased soil phosphorus availability. Structural equation modeling revealed that soil pH was the primary factor influencing changes in functional genes associated with phosphorus cycling in C. lanceolata plantations. Specifically, soil pH (ranging from 4.3 to 4.9) were positively correlated with genes involved in inorganic phosphate solubilization and organic phosphate mineralization, while negatively correlated with genes related to phosphorus uptake and transport. Conclusions: Taken together, our results demonstrate that the enhanced microbe-mediated mineralization of organic phosphorus and solubilization of inorganic phosphorus are suppressed when uptake and transportation are the mechanisms responsible for the increased soil phosphorus availability under appropriate thinning intensities. Changes in the soil microbial community and phosphorus cycling genes in response to different thinning intensities may maintain soil functionality and nutrient balance in C. lanceolata plantations. These findings contribute to a better understanding of the mechanisms underlying the microbial mediation of phosphorus cycling in the soil of C. lanceolata plantations.

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Section: Shifts In the Functional Genes Of Soil Phosphorus Cycling Af...mentioning

confidence: 98%

Section: Effects Of Different Thinning Intensities On Soil Phosphorus...mentioning

confidence: 99%

Section: Shifts In the Functional Genes Of Soil Phosphorus Cycling Af...mentioning

confidence: 99%

See 1 more Smart Citation

Responses of Soil Phosphorus Cycling-Related Microbial Genes to Thinning Intensity in Cunninghamia lanceolata Plantations

Ma,

Wang,

Chen

et al. 2024

Forests

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Soil nitrogen regulates root carbon secretion in the context of global change: A global meta‐analysis

Zeng,

Li,

Xing

et al. 2024

Functional Ecology

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The secretion of root exudates plays a crucial regulatory role in the process of soil carbon cycling. It is also significantly affected by global change factors (GCFs), yet the general patterns of these changes have not been fully explored, which greatly limits the accurate establishment of carbon cycling models under the background of global change. To address this, we conducted a meta‐analysis that included 1926 data pairs to examine the effects of global variability on root exudates. Furthermore, we performed multi‐model inference using Akaike's information criterion (AIC) to assess the relative importance of multiple factors such as annual average temperature (AAT), type of ecosystem, intensity of treatment, duration and more. The findings revealed that GCFs generally improved the production of root exudates. While the addition of nitrogen and its interaction with increased temperature significantly reduced the rate of root carbon secretion, all other factors significantly promoted it. Interestingly, as the intensity of warming increased, the rate of root carbon secretion caused by warming displayed a downward trend, with a threshold of 3.6°C. Furthermore, the influence of GCFs on root carbon secretion was found to be regulated by soil nitrogen, confirming the importance of nutrients from the rhizosphere in this process. These results underscore the importance of GCFs in root exudates and emphasize the crucial role of soil total nitrogen in the regulation of root carbon secretion. They also provide valuable scientific parameters for the development of more accurate models for the global‐change carbon cycle. Read the free Plain Language Summary for this article on the Journal blog.

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Impact of nitrogen addition on the chemical properties and bacterial community of subtropical forests in northern Guangxi

Jiang,

Ou,

Tan

et al. 2024

Front. Microbiol.

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IntroductionIn recent years, nitrogen deposition has constantly continued to rise globally. However, the impact of nitrogen deposition on the soil physicochemical properties and microbial community structure in northern Guangxi is still unclear.MethodsAlong these lines, in this work, to investigate the impact of atmospheric nitrogen deposition on soil nutrient status and bacterial community in subtropical regions, four different nitrogen treatments (CK: 0 gN m–2 a–1, II: 50 gN m–2 a–1, III: 100 gN m–2 a–1, IV: 150 gNm– 2 a–1) were established. The focus was on analyzing the soil physical and chemical properties, as well as bacterial community characteristics across varying nitrogen application levels.Results and discussionFrom the acquired results, it was demonstrated that nitrogen application led to a significant decrease in soil pH. Compared with CK, the pH of treatment IV decreased by 4.23%, which corresponded to an increase in soil organic carbon and total nitrogen. Moreover, compared with CK, the soil organic carbon of treatment IV increased by 9.28%, and the total nitrogen of treatment IV increased by 19.69%. However, no significant impact on the available nitrogen and phosphorus was detected. The bacterial diversity index first increased and then decreased with the increase of the nitrogen application level. The dominant phylum in the soil was Acidobacteria (34.63–40.67%), Proteobacteria, and Chloroflexi. Interestingly, the abundance of Acidobacteria notably increased with higher nitrogen application levels, particularly evident in the IV treatment group where it surpassed the control group. Considering that nitrogen addition first changes soil nutrients and then lowers soil pH, the abundance of certain oligotrophic bacteria like Acidobacteria can be caused, which showed a first decreasing and then increasing trend. On the contrary, eutrophic bacteria, such as Actinobacteria and Proteobacteria, displayed a decline. From the redundancy analysis, it was highlighted that total nitrogen and pH were the primary driving forces affecting the bacterial community composition.

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Mechanisms underlying soil microbial regulation of available phosphorus in a temperate forest exposed to long-term nitrogen addition

Cited by 3 publications

References 43 publications

Responses of Soil Phosphorus Cycling-Related Microbial Genes to Thinning Intensity in Cunninghamia lanceolata Plantations

Responses of Soil Phosphorus Cycling-Related Microbial Genes to Thinning Intensity in Cunninghamia lanceolata Plantations

Soil nitrogen regulates root carbon secretion in the context of global change: A global meta‐analysis

Impact of nitrogen addition on the chemical properties and bacterial community of subtropical forests in northern Guangxi

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