Response of soil organic matter fractions and composition of microbial community to long-term organic and mineral fertilization

Tian, Jing; Lou, Yunwei; Gao, Yang; Fang, Huajun; Liu, Shutang; Xu, Minggang; Blagodatskaya, Еvgenia; Kuzyakov, Yakov

doi:10.1007/s00374-017-1189-x

Cited by 125 publications

(64 citation statements)

References 63 publications

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“…The C content of fine POM under the high level of NaNO 3 treatment was 1.33 times greater than the control plot (p < 0.05) ( Figure 2). This is in accordance with previous research on the effect of N deposition on C contents of SOM fractions [41,55]. Though coarse POM and fine POM were not occluded within micro-aggregates, mainly derived from new plant input (litter and root detritus) [56], exogenous N input would be preferably adsorbed in fine POM compared to coarse POM fraction.…”

Section: Percentages and C Contents Of Particulate Fractionssupporting

confidence: 92%

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Geng

Cheng

Han

et al. 2019

Forests

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Key Findings: Combining physical fractionation and pyrolysis–gas chromatography/mass spectrometry (py-GC/MS) technique can help better understand the dynamics of soil organic matter (SOM). Background and Objectives: SOM plays a critical role in the global carbon (C) cycle. However, its complexity remains a challenge in characterizing chemical molecular composition within SOM and under nitrogen (N) deposition. Materials and Methods: Three particulate organic matter (POM) fractions within SOM and under N treatments were studied from perspectives of distributions, C contents and chemical signatures in a subtropical forest. N addition experiment was conducted with two inorganic N forms (NH4Cl and NaNO3) applied at three rates of 0, 40, 120 kg N ha−1 yr−1. Three particle-size fractions (>250 μm, 53–250 μm and <53 μm) were separated by a wet-sieving method. Py-GC/MS technique was used to differentiate between chemical composition. Results: A progressive proportion transfer of mineral-associated organic matter (MAOM) to fine POM under N treatment was found. Only C content in fine POM was sensitive to N addition. Principal component analyses (PCA) showed that the coarse POM had the largest plant-derived markers (lignins, phenols, long-chain n-alkanes, and n-alkenes). Short-chain n-alkanes and n-alkenes, benzofurans, aromatics and polycyclic aromatic hydrocarbons mainly from black carbon prevailed in the fine POM. N compounds and polysaccharides from microbial products dominated in the MAOM. Factor analysis revealed that the degradation extent of three fractions was largely distinct. The difference in chemical structure among three particulate fractions within SOM was larger than treatments between control and N addition. In terms of N treatment impact, the MAOM fraction had fewer benzofurans compounds and was enriched in polysaccharides, indicating comparatively weaker mineralization and stronger stabilization of these substances. Conclusions: Our findings highlight the importance of chemical structure in SOM pools and help to understand the influence of N deposition on SOM transformation.

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Section: Percentages and C Contents Of Particulate Fractionssupporting

confidence: 92%

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Geng

Cheng

Han

et al. 2019

Forests

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“…Management practices and sites had a strong influence on soil chemical properties, which, in turn, affected bacterial and fungal community composition. Forward selection revealed that the two kingdoms responded to different sets of soil physicochemical parameters, namely, bacterial community composition was affected by Ca and Mg, while fungal community composition was affected by Ca, Na, and K. These predictors are notably different from variables commonly accepted as important for microbial community composition, such as organic matter (46,47), pH (48,49), and N. The failure of organic matter and N to predict microbial community structure is surprising at first glance, given that scarce C and N availability can limit rates of microbial growth and functions such as mineralization and that the abundance of N-cycling microbial taxa often varies with C and inorganic N species. However, this result is consistent with multiple studies showing no effect of N on microbial community composition (50)(51)(52).…”

Section: Discussionmentioning

confidence: 98%

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt

Vannette

Igwe

et al. 2019

Appl Environ Microbiol

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Agricultural management practices affect bulk soil microbial communities and the functions they carry out, but it remains unclear how these effects extend to the rhizosphere in different agroecosystem contexts. Given close linkages between rhizosphere processes and plant nutrition and productivity, understanding how management practices impact this critical zone is of great importance to optimize plant-soil interactions for agricultural sustainability. A comparison of six paired conventional-organic processing tomato farms was conducted to investigate relationships between management, soil physicochemical parameters, and rhizosphere microbial community composition and functions. Organically managed fields were higher in soil total N and NO 3 -N, total and labile C, plant Ca, S, and Cu, and other essential nutrients, while soil pH was higher in conventionally managed fields. Differential abundance, indicator species, and random forest analyses of rhizosphere communities revealed compositional differences between organic and conventional systems and identified management-specific microbial taxa. Phylogeny-based trait prediction showed that these differences translated into more abundant pathogenesis-related gene functions in conventional systems. Structural equation modeling revealed a greater effect of soil biological communities than physicochemical parameters on plant outcomes. These results highlight the importance of rhizosphere-specific studies, as plant selection likely interacts with management in regulating microbial communities and functions that impact agricultural productivity. IMPORTANCE Agriculture relies, in part, on close linkages between plants and the microorganisms that live in association with plant roots. These rhizosphere bacteria and fungi are distinct from microbial communities found in the rest of the soil and are even more important to plant nutrient uptake and health. Evidence from field studies shows that agricultural management practices such as fertilization and tillage shape microbial communities in bulk soil, but little is known about how these practices affect the rhizosphere. We investigated how agricultural management affects plant-soil-microbe interactions by comparing soil physical and chemical properties, plant nutrients, and rhizosphere microbial communities from paired fields under organic and conventional management. Our results show that human management effects extend even to microorganisms living in close association with plant roots and highlight the importance of these bacteria and fungi to crop nutrition and productivity.

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“…Similarly, a more sensitive response of soil fine POC to N addition relative to total SOC was found in other N fertilization experiments (Cheng et al., ; Yu et al., ). Although cPOM and fPOM are mainly derived from new plant residues, fPOM is not occluded within microaggregates and is susceptible to microbial decomposition (Tian et al., ). Because the change in soil MAOC concentration explained about 90% of the variation in the change in SOC concentration (Figure 4c), insignificant accumulation in soil MAOC led to no change in the SOC concentration under N enrichment.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen fertilization changes the molecular composition of soil organic matter in a subtropical plantation forest

Geng

Cheng

Fang

et al. 2020

Soil Science Soc of Amer J

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The biochemical mechanisms responsible for soil organic C (SOC) accumulation under N enrichment are not well understood. By examining two N types (NH4Cl and NaNO3) and three rates (0, 40, and 120 kg N ha−1 yr−1), we investigated the concentration and distribution of SOC by using soil aggregate separation and physical fractionation of soil organic matter (SOM). The molecular composition of SOM within bulk soil and each physical fraction was determined by pyrolysis–gas chromatography‐mass spectrometry. Nitrogen fertilization led to soil NO3−–N accumulation and intensified soil acidification. Four years of N fertilization did not change total SOC concentrations in the 0‐ to 20‐cm depth but a high rate of NaNO3 addition increased the concentrations of fine particulate organic C and microaggregate‐associated organic C by 133 and 83.4%, respectively. The change in SOC concentration was positively correlated with the change in fine particulate organic C and mineral‐associated organic C concentrations. Four years of N fertilization significantly changed the molecular composition of SOM, with an increase in the relative abundance of furfural and acetic acid and a decrease in pyrrole in the mineral‐associated organic matter (MAOM) fraction. Fertilization increased the furfural/pyrrole and aliphatic/aromatic ratios in the SOM and MAOM fractions, suggesting decreased stability of the passive SOM fraction. The SOC concentration was negatively correlated with the benzene/toluene ratio in both bulk soil and the MAOM fraction. Overall, exogenous N input to this subtropical plantation forest decreased the mineralization and humification of SOM, which could be detrimental to soil C accumulation.

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Response of soil organic matter fractions and composition of microbial community to long-term organic and mineral fertilization

Cited by 125 publications

References 63 publications

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Nitrogen fertilization changes the molecular composition of soil organic matter in a subtropical plantation forest

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