Soil organic carbon decomposition responding to warming under nitrogen addition across Chinese vegetable soils

Xu, Xintong; Zhang, Qianqian; Song, Mengxin; Zhang, Xi; Bi, Ruiyu; Zhan, Liping; Dong, Yubing; Xiong, Zhengqin

doi:10.1016/j.ecoenv.2022.113932

Cited by 7 publications

(3 citation statements)

References 61 publications

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“…However, the importance of microbial physiology to Q 10 of SOM decomposition has often been neglected in previous studies ( Zhu and Cheng, 2011 ; Su et al, 2022 ). Recently, Xu et al (2022) found that vegetable field soils in warmer regions tended to have lower CUE and higher Q 10 of SOM decomposition, highlighting the possible control over Q 10 by CUE. Therefore, Q 10 may be modeled as a function of microbial physiological parameters such as CUE.…”

Section: Discussionmentioning

confidence: 99%

“…Thereafter, three replicates per treatment were maintained at 20°C, while the other three were incubated at 30°C for 44 days to mimic a short-term soil warming event. Such magnitude of temperature rise was larger than those estimated in various climate change projections ( IPCC, 2022 ), but was generally adopted in incubation studies to maximize temperature effects over short time scales (e.g., Fang et al, 2014 ; Xu et al, 2022 ). Soil CO 2 emitted over the study period, as well as its isotopic composition, was determined after 44 days of warming ( Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

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Contrasting effects of maize litter and litter-derived biochar on the temperature sensitivity of paddy soil organic matter decomposition

Cui

Ge²,

Nie³

et al. 2022

Front. Microbiol.

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Organic matter input regulates the rate and temperature sensitivity (expressed as Q10) of soil organic matter (SOM) decomposition by changing microbial composition and activities. It remains unclear how the incorporation of litter-made biochar instead of litter affects the Q10 of SOM decomposition. Using a unique combination of two-and three-source partitioning methods (isotopic discrimination between C3/C4 pathways and 14C labeling), we investigated: (1) how maize litter versus litter-made biochar (of C4 origin) addition influenced the Q10 of SOM (C3 origin) under 10°C warming, and (2) how the litter or biochar amendments affected the Q10 of 14C-labeled fresh organic matter (FOM) after long-term incubation. Compared with biochar addition, litter increased the rates and Q10 of mass-specific respiration, SOM and FOM decomposition, as well as the contents of SOM-derived dissolved organic C (DOC) and total phospholipid fatty acids (PLFA). Litter-amended soils have much higher activities (Vmax) of β-glucosidase, N-acetyl-β-glucosaminidase, and leucine aminopeptidase, suggesting larger enzyme pools than in soils with biochar. The Q10 of enzyme Vmax (1.6–2.0) and Km (1.2–1.4) were similar between litter-and biochar-amended soils, and remained stable with warming. However, warming reduced microbial biomass (PLFA) and enzyme activity (Vmax), suggesting decreased enzyme production associated with smaller microbial biomass or faster enzyme turnover at higher temperatures. Reductions in PLFA content and enzyme Vmax due to warming were larger in litter-amended soils (by 31%) than in the control and biochar-amended soils (by 4–11%), implying the active litter-feeding microorganisms have a smaller degree of heat tolerance than the inactive microorganisms under biochar amendments. The reduction in enzyme activity (Vmax) by warming was lower in soils with biochar than in the control soil. Our modeling suggested that the higher Q10 in litter-amended soils was mainly caused by faster C loss under warming, linked to reductions in microbial biomass and growth efficiency, rather than the slightly increased SOM-originated substrate availability (DOC). Overall, using straw-made biochar instead of straw per se as a soil amendment lowers the Q10 of SOM and FOM by making microbial communities and enzyme pools more temperature-tolerant, and consequently reduces SOM losses under warming.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Contrasting effects of maize litter and litter-derived biochar on the temperature sensitivity of paddy soil organic matter decomposition

Cui

Ge²,

Nie³

et al. 2022

Front. Microbiol.

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“…In some studies, N addition significantly increased UE activity due to increased microbial demand for C, N, and P; by contrast, others reported a negative effect on UE activity ( Saiya-Cork, Sinsabaugh & Zak, 2002 ; Stone et al, 2012 ), particularly during the early growing season ( Andersson, Kj?Ller & Struwe, 2004 ; Weintraub & Schimel, 2005 ; Zhang et al, 2022 ). The effect of N on soil enzyme activity has been attributed to variations in (i) nutrient effectiveness, (ii) litter and soil C:N ratios, and (iii) microbial biomass ( Treseder & Vitousek, 2001 ; Ullah et al, 2023 ; Xu et al, 2022 ). Increasing N effectiveness affects soil enzyme function and activity, promoting SOM decomposition and stimulating plant growth by alleviating N limitation ( Cusack & Daniela, 2013 ; Qin et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen addition enhances seed yield by improving soil enzyme activity and nutrients

Mi,

Luo,

Liu

et al. 2024

PeerJ

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Nitrogen (N) addition is a simple and effective field management approach to enhancing plant productivity. Nonetheless, the regulatory mechanisms governing nitrogen concentrations and their effect on soil enzyme activity, nutrient levels, and seed yield in the Festuca kirilowii seed field have yet to be elucidated. Therefore, this study sought to investigate the effect of N fertilizer application on soil enzyme activities, soil nutrients, and seed yield of F. kirilowii Steud cv. Huanhu, the only domesticated variety in the Festuca genus of the Poaceae family, was investigated based on two-year field experiments in the Qinghai–Tibet Plateau (QTP). Results showed that N input significantly affected soil nutrients (potential of hydrogen, total nitrogen, organic matter, and total phosphorus). In addition, soil enzyme activities (urease, catalase, sucrase, and nitrate reductase) significantly increased in response to varying N concentrations, inducing changes in soil nutrient contents. Introducing N improved both seed yield and yield components (number of tillers and number of fertile tillers). These findings suggest that the introduction of different concentrations of N fertilizers can stimulate soil enzyme activity, thus hastening nutrient conversion and increasing seed yield. The exhaustive evaluation of the membership function showed that the optimal N fertilizer treatment was N4 (75 kg·hm−2) for both 2022 and 2023. This finding provides a practical recommendation for improving the seed production of F. kirilowii in QTP.

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Modeling soil acidity (pH) dynamics under extreme agroclimatic conditions in Horro Guduru Wallaga Zone, northwestern Ethiopia

Temesgen,

Chalchissa

2024

Environ Geochem Health

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Soil organic carbon decomposition responding to warming under nitrogen addition across Chinese vegetable soils

Cited by 7 publications

References 61 publications

Contrasting effects of maize litter and litter-derived biochar on the temperature sensitivity of paddy soil organic matter decomposition

Contrasting effects of maize litter and litter-derived biochar on the temperature sensitivity of paddy soil organic matter decomposition

Nitrogen addition enhances seed yield by improving soil enzyme activity and nutrients

Modeling soil acidity (pH) dynamics under extreme agroclimatic conditions in Horro Guduru Wallaga Zone, northwestern Ethiopia

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