Organic-C quality as a key driver of microbial nitrogen immobilization in soil: A meta-analysis

Cao, Yingnan; He, Zhenli; Zhu, Ting; Zhao, Fengliang

doi:10.1016/j.geoderma.2020.114784

Cited by 59 publications

(30 citation statements)

References 58 publications

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“…C. Lu et al (2018) also found that substrate amendments such as crop residues may constitute a practical agricultural management approach for promoting the transformation of fertilizer N to SON. Microbial N immobilization is highly dependent on the quantity and quality of exogenous organic C input (Cao et al, 2021;Cheng et al, 2017). Optimizing the exogenous organic C management in agricultural soils has great potential to retain excess fertilizer N as SON and reduce its environmental risk.…”

Section: Effects Of Exogenous Organic C On N Transformationsmentioning

confidence: 99%

“…The chemical quality and quantity of organic C are critical factors in regulating the response of microbial N immobilization to organic C addition (Cao et al., 2021; Cheng et al., 2017). It has been reported that glucose, classified as a labile compound, was more effective in stimulating microbial N immobilization than other complex organic C, such as cellulose and plant residues (Cao et al., 2021). Microbial N immobilization was enhanced when the addition of labile organic C was at a rate >500 mg C kg –1 (Cheng et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

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Enriching organic carbon bioavailability can mitigate soil acidification induced by nitrogen fertilization in croplands through microbial nitrogen immobilization

Guan

Wang

Nkoh

et al. 2022

Soil Science Soc of Amer J

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Excessive application of ammonium-based N fertilizers promote nitrification, which is mainly responsible for intensive acidification in cropland soils. Thus, there is an urgent need for the development of control measures to manage soil acidification induced by N fertilization. In this study, we investigated the potential of enriching organic C bioavailability to mitigate acidification induced by N fertilization through microbial N immobilization using an indoor incubation experiment. Results showed that the sole application of ammonium sulfate [(NH 4 ) 2 SO 4 ] or urea to a cropland soil promoted nitrification of fertilizer N, and subsequently soil pH decreased by 0.48-1.00 units after 45-d incubation. The combined application of glucose with N fertilizers induced microbial immobilization of almost all fertilizer N within 1 d and gradually induced mineralization of soil organic N after 1 wk of incubation. More than 65% of immobilized total extractable N was returned to soil solution and mainly existed as NH 4 + -N and extractable organic N, with the pH decrement being <0.10 units after 45-d incubation. These results indicated that (a) enriching organic C bioavailability in cropland soils intensified microbial N immobilization, (b) intensification of microbial N immobilization induced a buffering effect to regulate soil inorganic N supply, and (c) microbial N immobilization had great potential to inhibit soil acidification and retard aluminum mobilization. The results obtained in this study provide a theoretical strategy to control soil acidification and increase N use efficiency in croplands.

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Section: Effects Of Exogenous Organic C On N Transformationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enriching organic carbon bioavailability can mitigate soil acidification induced by nitrogen fertilization in croplands through microbial nitrogen immobilization

Guan

Wang

Nkoh

et al. 2022

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…However, the relationship between N immobilization and the soil C/N ratio is uncertain in forest soils. For instance, in a 15 N tracing study, the highest NH 4 + immobilization was found in the treatment with a low soil C/N ratio [26][27][28][29], while there was no correlation between NH 4 + immobilization and the soil C/N ratio. In many cases, the increase in soil C/N (15 to 30) did not promote microbial N immobilization [30][31][32], which is inconsistent with the assertion that microbial N immobilization was accelerated in the high C availability by stimulating heterotrophic microorganisms [33].…”

Section: Introductionmentioning

confidence: 98%

Utilization of Glycine by Microorganisms along the Altitude Changbai Mountain, China: An Uptake Test Using 13C,15N Labeling and 13C-PLFA Analysis

Xue

Zhang

et al. 2022

Forests

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External organic nitrogen (N) inputs can contrastingly affect the transformation and availability of N in forest soils, which is an important potential N resource and is possibly vulnerable to soil properties. Little is known about the transformation and availability of external small molecule organic N in forest soils and the underlying microbial mechanisms. Soil samples from Changbai Mountain at different altitudes (from 750 m to 2200 m) that ranged widely in soil properties were incubated with 13C, 15N-labeled glycine. The fate of 15N-glycine and the incorporation of 13C into different phospholipid fatty acids (PLFAs) were measured at the same time. The addition of glycine promoted gross N mineralization and microbial N immobilization significantly. Mineralization of glycine N accounted for 6.2–22.5% of the added glycine and can be explicable in the light of a readily mineralizable substrate by soil microorganisms. Assimilation of glycine N into microbial biomass by the mineralization-immobilization-turnover (MIT) route accounted for 24.7–52.1% of the added label and was most mightily affected by the soil C/N ratio. We also found that the direct utilization of glycine is important to fulfill microorganism growth under the lack of available carbon (C) at upper elevations. The labeled glycine was rapidly incorporated into the PLFAs and was primarily assimilated by bacteria, indicating that different groups of the microbial community were answerable to external organic N. G+ bacteria were the main competitors for the exogenous glycine. Increased intact incorporation of glycine into microbial biomass and the concentration of PLFAs in general, particularly in G+ bacteria, suggest a diversified arrangement to response changes in substrate availability.

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“…After nitrogen fertilizers are applied to farmland soils, their fate can be roughly divided into three parts: some nitrogen is transformed into effective nutrients and is absorbed and utilized by the crops [6]; some is fixed in the crystal lattice of soil minerals, and thus remains in the soil [7]; the remainder is lost through leaching, nitrification, and denitrification [8,9]. In China, the overall utilization efficiency of nitrogen fertilizers in agriculture is only 30-40% [10], and the data of the first national pollution census showed that total nitrogen Life 2022, 12, 53 2 of 11 loss from agricultural sources accounted for 57.2% of total emissions in China [11]; therefore, significant economic losses are caused by this inefficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of Partial Blackwater Substitution on Soil Potential NI-Trogen Leaching in a Summer Maize Field on the North China Plain

Zhang

Hao

Yang

et al. 2021

Life

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In China, promoting harmless blackwater treatment and resource utilization in rural areas is a priority of the “toilet revolution”. Exploring the effects of blackwater application in arid areas on soil nitrogen losses can provide a basis for more effective water and fertilizer management. This study analyzed nitrogen leaching and maize yield under blackwater application in the summer maize season of 2020. A total of 5 treatments were used: no fertilizer, single chemical fertilizer application (CF), single blackwater application (HH), and combined chemical fertilizer and blackwater application ratios of 1:1 (CH1) and 2:1 (CH2). The total nitrogen leached from the fertilization treatments was 53.14–60.95 kg·ha−1 and the leached nitrate nitrogen was 34.10–40.62 kg·ha−1. Nitrate nitrogen accounted for 50–62% of the total leached nitrogen. Compared with blackwater treatments, nitrate nitrogen moved into deeper soil layers (80–100 cm depth) during the CF treatment. Compared with CF, HH significantly reduced the maize yield by 24.39%. The nitrogen surplus of HH was higher than that of other fertilizer treatments. Considering nitrogen leaching, maize yield, and economic benefits, the CH2 treatment presented the optimal results. These findings address knowledge gaps and assist in guiding policy-makers to effectively promote China’s “toilet revolution”.

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Organic-C quality as a key driver of microbial nitrogen immobilization in soil: A meta-analysis

Cited by 59 publications

References 58 publications

Enriching organic carbon bioavailability can mitigate soil acidification induced by nitrogen fertilization in croplands through microbial nitrogen immobilization

Enriching organic carbon bioavailability can mitigate soil acidification induced by nitrogen fertilization in croplands through microbial nitrogen immobilization

Utilization of Glycine by Microorganisms along the Altitude Changbai Mountain, China: An Uptake Test Using 13C,15N Labeling and 13C-PLFA Analysis

Effects of Partial Blackwater Substitution on Soil Potential NI-Trogen Leaching in a Summer Maize Field on the North China Plain

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