Nitrogen deposition may enhance soil carbon storage via change of soil respiration dynamic during a spring freeze-thaw cycle period

Yan, Guoyong; Xing, Yajuan; Xu, Luping; Wang, Yunlong; Meng, Wei; Wang, Qinggui; Yu, Jinghua; Zhang, Zhi; Wang, Zhidong; Jiang, Siling; Liu, Boqi; Han, Shijie

doi:10.1038/srep29134

Cited by 20 publications

(11 citation statements)

References 61 publications

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“…Short-term environmental perturbations often have large impacts on biogeochemical rate measurements. For example, as seen in this microcosm experiment and in field studies, N pulse deposition decreased respiration, while water addition stimulated respiration (28,(48)(49)(50). However, results from this study and other studies (51, 52; B. Steven and C. R. Kuske, submitted for publication) suggest that biogeochemical flux responses to short-term environmental perturbations may be invoked by highly complex responses and/or mechanisms not represented by conventional genomic markers.…”

Section: Discussionsupporting

confidence: 42%

Short-Term Transcriptional Response of Microbial Communities to Nitrogen Fertilization in a Pine Forest Soil

Albright

Johansen

Lopez

et al. 2018

Appl Environ Microbiol

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Numerous studies have examined the long-term effect of experimental nitrogen (N) deposition in terrestrial ecosystems; however, N-specific mechanistic markers are difficult to disentangle from responses to other environmental changes. The strongest picture of N-responsive mechanistic markers is likely to arise from measurements over a short (hours to days) time scale immediately after inorganic N deposition. Therefore, we assessed the short-term (3-day) transcriptional response of microbial communities in two soil strata from a pine forest to a high dose of N fertilization (ca. 1 mg/g of soil material) in laboratory microcosms. We hypothesized that N fertilization would repress the expression of fungal and bacterial genes linked to N mining from plant litter. However, despite N suppression of microbial respiration, the most pronounced differences in functional gene expression were between strata rather than in response to the N addition. Overall, ∼4% of metabolic genes changed in expression with N addition, while three times as many (∼12%) were significantly different across the different soil strata in the microcosms. In particular, we found little evidence of N changing expression levels of metabolic genes associated with complex carbohydrate degradation (CAZymes) or inorganic N utilization. This suggests that direct N repression of microbial functional gene expression is not the principle mechanism for reduced soil respiration immediately after N deposition. Instead, changes in expression with N addition occurred primarily in general cell maintenance areas, for example, in ribosome-related transcripts. Transcriptional changes in functional gene abundance in response to N addition observed in longer-term field studies likely result from changes in microbial composition. Ecosystems are receiving increased nitrogen (N) from anthropogenic sources, including fertilizers and emissions from factories and automobiles. High levels of N change ecosystem functioning. For example, high inorganic N decreases the microbial decomposition of plant litter, potentially reducing nutrient recycling for plant growth. Understanding how N regulates microbial decomposition can improve the prediction of ecosystem functioning over extended time scales. We found little support for the conventional view that high N supply represses the expression of genes involved in decomposition or alters the expression of bacterial genes for inorganic N cycling. Instead, our study of pine forest soil 3 days after N addition showed changes in microbial gene expression related to cell maintenance and stress response. This highlights the challenge of establishing predictive links between microbial gene expression levels and measures of ecosystem function.

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Section: Discussionsupporting

confidence: 42%

Short-Term Transcriptional Response of Microbial Communities to Nitrogen Fertilization in a Pine Forest Soil

Albright

Johansen

Lopez

et al. 2018

Appl Environ Microbiol

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“…In contrast, N addition increased organic C pools in surface soils of QM, which agrees with several previous studies in China [44][45][46] . N is often the limiting nutrient in Northeast China, low levels of N addition generally increase plant production and the accumulation of soil organic matter, thus increasing the forest C sequestration [47] .…”

Section: Discussionsupporting

confidence: 92%

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Li¹,

Wang²,

Dou³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Nitrogen (N) deposition has a profound influence on forest soil carbon (C) and N pools, but there was no consensus on the responses of different C and N components in different forest types. In this study, a two-year simulated N deposition experiment with four levels of N (NH 4 NO 3)-addition treatments (0, 50, 100, and 150 kg N/hm 2 • a) were conducted in Larix gmelinii (LG) and Quercus mongolica (QM) plantation in Northeast China, in order to investigate the C and N pool dynamics under continuously enhanced N deposition. Soil organic carbon (SOC), soil total N (STN) and their active components (readily oxidizable C, ROC; dissolved organic C, DOC; microbial biomass C, MBC, dissolved organic N, DON; microbial biomass N, MBN) of the forest soil were measured monthly from May to October 2017. C and N contents in LG were observed higher than in QM. N addition had no effect on SOC and STN of LG, but significantly increased SOC and STN of QM at low N addition level. Low N addition generally raised active C components (ROC, DOC, and MBC) in both plantations, whereas high N addition did not significantly affect these components, or even decreased ROC in LG soil. Low N addition also increased STN and MBN of QM, while no significant change in STN and MBN of LG was observed. DON was directly affected by N addition and increased significantly with elevated N addition levels. The results indicated that N addition, especially of low rate, might enhance the C sequestration capacity of the forest soils and mitigate climate change.

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“…Compared to the N 2 O flux, the pulse of CO 2 flux from soils during thaw became much weaker and no obvious flush CO 2 flux was even reported by Rong et al (2015) in cropland and grassland. The maximum rates of soil CO 2 flux during thaw in this study (Supplementary Table S2) was within the reported values of 10-151 mg C m -2 h -1 in spruce and Korean pine forest lands (Wu et al, 2010;Yan et al, 2016). Considering the absence of peak flux in the field observation, the incipient rates of N 2 O and CO 2 fluxes calculated in this study (Figs 2 and 4) would be appropriate to represent the magnitude of N 2 O and CO 2 flush fluxes following spring soil thawing.…”

Section: Discussionsupporting

confidence: 56%

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

Wu¹,

Xu²,

Duan³

et al. 2017

International Agrophysics

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A b s t r a c t. Packed soil-core incubation experiments were done to study the effects of carbon (glucose, 6.4 g C m -2 ) and nitrogen (NH 4 Cl and KNO 3 , 4.5 g N m -2 ) addition on nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) fluxes during thawing of frozen soils under two forest stands (broadleaf and Korean pine mixed forest and white birch forest) with two moisture levels (55 and 80% water-filled pore space). With increasing soil moisture, the magnitude and longevity of the flush N 2 O flux from forest soils was enhanced during the early period of thawing, which was accompanied by great NO 3 --N consumption. Without N addition, the glucose-induced cumulative CO 2 fluxes ranged from 9.61 to 13.49 g CO 2 -C m -2 , which was larger than the dose of carbon added as glucose. The single addition of glucose increased microbial biomass carbon but slightly affected soil dissolved organic carbon pool. Thus, the extra carbon released upon addition of glucose can result from the decomposition of soil native organic carbon. The glucose-induced N 2 O and CO 2 fluxes were both significantly correlated to the glucose-induced total N and dissolved organic carbon pools and influenced singly and interactively by soil moisture and KNO 3 addition. The interactive effects of glucose and nitrogen inputs on N 2 O and CO 2 fluxes from forest soils after frost depended on N sources, soil moisture, and vegetation types.

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Nitrogen deposition may enhance soil carbon storage via change of soil respiration dynamic during a spring freeze-thaw cycle period

Cited by 20 publications

References 61 publications

Short-Term Transcriptional Response of Microbial Communities to Nitrogen Fertilization in a Pine Forest Soil

Short-Term Transcriptional Response of Microbial Communities to Nitrogen Fertilization in a Pine Forest Soil

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

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