Nitrogen increases soil organic carbon accrual and alters its functionality

Tang, Bo; Rocci, Katherine S.; Lehmann, Anika; Rillig, Matthias C.

doi:10.1111/gcb.16588

Cited by 59 publications

(29 citation statements)

References 118 publications

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“…S17). Consistent with pioneer studies [14,70], our findings reinforced that soil nutrients, particularly nitrogen, may greatly contribute to carbon flow at the soil-root interface. More importantly, our present study indirectly verified these shifts partly due to the release of distinct root exudates from domesticated and wild wheat.…”

Section: Plant Domestication Shifts Rhizosphere Microbial Communities...supporting

confidence: 90%

Plant domestication shapes rhizosphere microbiome assembly and metabolic functions

Yue

Jiao

et al. 2023

Microbiome

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Background The rhizosphere microbiome, which is shaped by host genotypes, root exudates, and plant domestication, is crucial for sustaining agricultural plant growth. Despite its importance, how plant domestication builds up specific rhizosphere microbiomes and metabolic functions, as well as the importance of these affected rhizobiomes and relevant root exudates in maintaining plant growth, is not well understood. Here, we firstly investigated the rhizosphere bacterial and fungal communities of domestication and wild accessions of tetraploid wheat using amplicon sequencing (16S and ITS) after 9 years of domestication process at the main production sites in China. We then explored the ecological roles of root exudation in shaping rhizosphere microbiome functions by integrating metagenomics and metabolic genomics approaches. Furthermore, we established evident linkages between root morphology traits and keystone taxa based on microbial culture and plant inoculation experiments. Results Our results suggested that plant rhizosphere microbiomes were co-shaped by both host genotypes and domestication status. The wheat genomes contributed more variation in the microbial diversity and composition of rhizosphere bacterial communities than fungal communities, whereas plant domestication status exerted much stronger influences on the fungal communities. In terms of microbial interkingdom association networks, domestication destabilized microbial network and depleted the abundance of keystone fungal taxa. Moreover, we found that domestication shifted the rhizosphere microbiome from slow growing and fungi dominated to fast growing and bacteria dominated, thereby resulting in a shift from fungi-dominated membership with enrichment of carbon fixation genes to bacteria-dominated membership with enrichment of carbon degradation genes. Metagenomics analyses further indicated that wild cultivars of wheat possess higher microbial function diversity than domesticated cultivars. Notably, we found that wild cultivar is able to harness rhizosphere microorganism carrying N transformation (i.e., nitrification, denitrification) and P mineralization pathway, whereas rhizobiomes carrying inorganic N fixation, organic N ammonification, and inorganic P solubilization genes are recruited by the releasing of root exudates from domesticated wheat. More importantly, our metabolite-wide association study indicated that the contrasting functional roles of root exudates and the harnessed keystone microbial taxa with different nutrient acquisition strategies jointly determined the aboveground plant phenotypes. Furthermore, we observed that although domesticated and wild wheats recruited distinct microbial taxa and relevant functions, domestication-induced recruitment of keystone taxa led to a consistent growth regulation of root regardless of wheat domestication status. Conclusions Our results indicate that plant domestication profoundly influences rhizosphere microbiome assembly and metabolic functions and provide evidence that host plants are able to harness a differentiated ecological role of root-associated keystone microbiomes through the release of root exudates to sustain belowground multi-nutrient cycles and plant growth. These findings provide valuable insights into the mechanisms underlying plant-microbiome interactions and how to harness the rhizosphere microbiome for crop improvement in sustainable agriculture.

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Section: Plant Domestication Shifts Rhizosphere Microbial Communities...supporting

confidence: 90%

Plant domestication shapes rhizosphere microbiome assembly and metabolic functions

Yue

Jiao

et al. 2023

Microbiome

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“…MAOC, on average, persists longer than POC, and considers as more stable SOC (Tang et al, 2023). Previous Microbial Efficiency-Matrix Stabilization (MEMS) framework also pointed out that plant constituents were the dominant source of microbial products, and these microbial products of decomposition would thus become the main precursors of a stable SOC pool (Cotrufo et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that two components (POC vs. MAOC) of the SOC pool are very different in terms of their formation, persistence, and functioning (Cotrufo et al, 2013; Lavallee et al, 2020). MAOC, on average, persists longer than POC, and considers as more stable SOC (Tang et al, 2023). Previous Microbial Efficiency‐Matrix Stabilization (MEMS) framework also pointed out that plant constituents were the dominant source of microbial products, and these microbial products of decomposition would thus become the main precursors of a stable SOC pool (Cotrufo et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Exogenous carbon turnover within the soil food web strengthens soil carbon sequestration through microbial necromass accumulation

Kou

Morriën

Tian

et al. 2023

Global Change Biology

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Exogenous carbon turnover within soil food web is important in determining the tradeoffs between soil organic carbon (SOC) storage and carbon emission. However, it remains largely unknown how soil food web influences carbon sequestration through mediating the dual roles of microbes as decomposers and contributors, hindering our ability to develop policies for soil carbon management. Here, we conducted a 13 Clabeled straw experiment to demonstrate how soil food web regulated the residing microbes to influence the soil carbon transformation and stabilization process after 11 years of no-tillage. Our work demonstrated that soil fauna, as a "temporary storage

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“…Forest ecosystems occupy most of Earth's biomes and harbor most of the terrestrial global diversity (Crowther et al., 2015). A moderate N supply may promote nutrient cycling (Yin et al., 2022), and enhance C sequestration through positive feedback with vegetation growth in forest (Tang et al., 2023). However, N deposition, especially at high levels or over long durations, may cause plant nutrient imbalances, resulting in inhibitory effects on plant communities (Roth et al., 2022) and biodiversity (Clark et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Canopy nitrogen deposition enhances soil ecosystem multifunctionality in a temperate forest

Yang,

Zhu,

Zhang

et al. 2024

Global Change Biology

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Nitrogen (N) deposition affects ecosystem functions crucial to human health and well‐being. However, the consequences of this scenario for soil ecosystem multifunctionality (SMF) in forests are poorly understood. Here, we conducted a long‐term field experiment in a temperate forest in China, where N deposition was simulated by adding N above and under the canopies. We discover that canopy N addition promotes SMF expression, whereas understory N addition suppresses it. SMF was regulated by fungal diversity in canopy N addition treatments, which is largely due to the strong resistance to soil acidification and efficient resource utilization characteristics of fungi. While in understory N addition treatments, SMF is regulated by bacterial diversity, which is mainly because of the strong resilience to disturbances and fast turnover of bacteria. Furthermore, rare microbial taxa may play a more important role in the maintenance of the SMF. This study provides the first evidence that N deposition enhanced SMF in temperate forests and enriches the knowledge on enhanced N deposition affecting forest ecosystems. Given the divergent results from two N addition approaches, an innovative perspective of canopy N addition on soil microbial diversity‐multifunctionality relationships is crucial to policy‐making for the conservation of soil microbial diversity and sustainable ecosystem management under enhanced N deposition. In future research, the consideration of canopy N processes is essential for more realistic assessments of the effects of atmospheric N deposition in forests.

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Nitrogen increases soil organic carbon accrual and alters its functionality

Cited by 59 publications

References 118 publications

Plant domestication shapes rhizosphere microbiome assembly and metabolic functions

Plant domestication shapes rhizosphere microbiome assembly and metabolic functions

Exogenous carbon turnover within the soil food web strengthens soil carbon sequestration through microbial necromass accumulation

Canopy nitrogen deposition enhances soil ecosystem multifunctionality in a temperate forest

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