Soil organic matter priming and carbon balance after straw addition is regulated by long-term fertilization

Wu, Lianghuan; Zhang, Wenju; Wei, Wenjuan; He, Zhilong; Kuzyakov, Yakov; Bol, Roland; Hu, Ronggui

doi:10.1016/j.soilbio.2019.06.003

Cited by 85 publications

(27 citation statements)

References 70 publications

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“…Chemical fertilizers provide essential nutrients to tea plants and thus improve the bush tea shoot mass and the production of compounds (Mudau et al, 2005;Yang et al, 2014). The addition of organic materials not only maintains soil fertility but also improves soil structure and soil porosity (Kallenbach et al, 2010;Wu et al, 2019). However, fertilization changes community structure of microbes and affects the decomposition of organic matter (Bao et al, 2016;Wei et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, Bodelier and Laanbroek (2004) reported that the application of N fertilizer directly promote the oxidation of CH 4 by nitrifying bacteria. Adding straw and green manure to soil are important measures to improve soil organic matter (Wu et al, 2019;Yu et al, 2020). The application of organic fertilizers can promote microbial decomposition activities and root respiration, leading to the increase of the CO 2 emission of soil (Qiu et al, 2015;.…”

Section: Introductionmentioning

confidence: 99%

“…Soil respiration is the main flux of C between the atmosphere and soil, and soil C loss can be quantified by soil CO 2 and CH 4 emission (Khan et al, 2017;. Studies have shown that fertilization can increase soil C sequestration and reduce GHG emissions (Wu et al, 2019). By exploring the emission characteristics of soil CO 2 and CH 4 in tea plantations, we can understand the soil C sequestration and provide theoretical basis for improving the productivity of tea.…”

Section: Introductionmentioning

confidence: 99%

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Effects of inorganic and organic fertilizers on CO2 and CH4 fluxes from tea plantation soil

Lin

Zhang

Shen

et al. 2021

Elementa: Science of the Anthropocene

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Agricultural practices such as fertilization considerably influence soil greenhouse gas fluxes. However, the effects of fertilization on greenhouse gases fluxes remain unclear in tea soil when soil nitrogen is low. In the present study, soil CO2 and CH4 fluxes under various fertilization treatments in tea soil were investigated during a 50-day period. The experiment consisted of five treatments: no fertilizer (CK), single nitrogen (urea, N), single oilseed rape cake fertilizer (R), nitrogen + cake fertilizer (2:1, NR1), and nitrogen + cake fertilizer (1:2, NR2). The fertilization proportion of NR1 and NR2 was determined by the nitrogen content of nitrogen fertilizer and cake fertilizer. The results revealed that the single application of nitrogen had no significant effect on soil CO2 flux. However, the addition of cake fertilizer significantly increased CO2 emissions through enhanced soil microbial biomass carbon (MBC). Additionally, CO2 emissions were directly proportional to the amount of carbon (C) in the fertilizer. All treatments were minor sinks for CH4 except for the treatment NR1. Specifically, the cumulative CH4 fluxes of NR1 and NR2 were significantly higher than rest of the three treatments, which implies that application of urea and oilseed rape cake reduced the capability of CH4 oxidation in tea soil. Structural equation models indicated that soil CO2 flux is significantly and positively correlated with soil dissolved organic carbon, MBC and soil pH, while mineral nitrogen content was the main factor affecting CH4 flux. Overall, the application of oilseed rape cake increased the oxidation of CH4 and promoted soil C sequestration but inevitably increased the soil CO2 emissions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of inorganic and organic fertilizers on CO2 and CH4 fluxes from tea plantation soil

Lin

Zhang

Shen

et al. 2021

Elementa: Science of the Anthropocene

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“…Incorporation of straw into soils is commonly used to improve soil fertility and crop yield by returning nutrient‐rich organic matter to soils (Liu et al., 2014; Lu et al., 2009). However, straw incorporation may accelerate SOC decomposition and exert negligible or even negative impact on net amount of sequestered C, primarily because of increased microbial biomass, activities and C losses via mineralization and methanogenesis in aerobic and anaerobic soils (Wu et al., 2019; Zhu et al., 2018). As such, straw application may unintentionally increase CO 2 and CH 4 emissions to the atmosphere, thus contributing to global climate change and impeding sustainable agricultural development.…”

Section: Introductionmentioning

confidence: 99%

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Liu

et al. 2020

GCB Bioenergy

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“…Microbial activity and biomass increased as the straw released su cient soluble organic C for microbial growth [66,72,73]. The enzyme activity (BG and NAG), bacterial and fungal PLFA abundances, MBC, and DOC rapidly increased after straw additions during the initial 1-5 days and then decreased, con rmed for the temporal dynamics of CO 2 emissions (Additional File: Figure S1, S2, S3, and S4) [72,74,75]. Consequently, straw and N additions with greater C and N content as well as larger microbial populations and higher activity caused higher CO 2 uxes in the karst calcareous soils during the initial 1-3 days [66,70].…”

Section: Mucoromycota Abundance But Declined Fungal Diversity By Decrmentioning

confidence: 76%

Fungi Outcompete Bacteria for Straw and Soil Organic Matter Mineralization

Xiao¹,

He²,

Wang³

et al. 2020

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Background: Understanding the effects of straw return and nitrogen (N) fertilization on soil organic matter (SOM) transformations will help to mitigate climate change and maintain crop production and soil function. A 100-day soil incubation experiment was conducted using a two-factorial design with three fertilization levels and four 13C-labeled maize straw and N addition treatments. The competition and contributions of the bacterial and fungal communities were assessed with relation to straw mineralization.Results: Mineral fertilizer alone and with straw increased straw decomposition by 59% and 55% and SOM mineralization by 27% and 37%, respectively, compared with the unfertilized soil, due to raised β-N-acetylglucosaminidase and cellobiohyrolase activities. Conversely, priming effect was decreased by 59% and 39%, respectively. Priming effect increased with higher N additions and decreased with lower N additions because an improved C:N ratio for microorganisms. Straw additions increased bacterial and fungal abundance by 1.4 and 4.9 times. Fungal diversity decreased with N fertilization because lower C:N ratios increased the bacterial competition. Bacterial abundance decreased but diversity increased with the duration of incubation as bacteria preferred to utilize labile organic compounds abundant in the initial stages. Along with labile organic compounds depletion, fungal abundance was increased. Firmicutes, Actinobacteria, and Proteobacteria bacterial as well as Ascomycota, Basidiomycota, and Mucoromycota fungi dominated straw and SOM decomposition. Firmicutes were mostly involved in straw and SOM mineralization on day one because of their capacity for labile compound decomposition. Integrated co-occurrence networks revealed that fungal taxa had a stronger correlation with straw decomposition than bacterial groups. Straw and N addition increased the number of negative edges among bacterial taxa but these decreased within fungal groups when compared to trials without straw and N. The ratio for pairwise correlations between abundant fungal taxa, straw, and SOM mineralization (29.9%) was greater than with bacteria (1.2%).Conclusions: Straw with low N additions increased soil C sequestration by decreasing priming effect. Straw alone and with N addition decreased competition for C and N among fungal groups, but increased competition within bacterial taxa. Fungi outcompete bacteria for straw and soil organic matter mineralization in long-term fertilized soils.

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Soil organic matter priming and carbon balance after straw addition is regulated by long-term fertilization

Cited by 85 publications

References 70 publications

Effects of inorganic and organic fertilizers on CO2 and CH4 fluxes from tea plantation soil

Effects of inorganic and organic fertilizers on CO2 and CH4 fluxes from tea plantation soil

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Fungi Outcompete Bacteria for Straw and Soil Organic Matter Mineralization

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