Nitrogen input in different chemical forms and levels stimulates soil organic carbon decomposition in a coastal wetland

Qu, Wendi; Eller, Franziska; Xie, Baohua; Wang, Jian; Wu, Haitao; Li, Juanyong; Zhao, Mengli

doi:10.1016/j.catena.2020.104672

Cited by 25 publications

(8 citation statements)

References 72 publications

(107 reference statements)

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“…This study illustrates that nitrogen deposition fosters an increase in soil organic carbon, consistent with findings in the Qinghai-Tibetan Plateau ( Xiao et al, 2020 ) and the Yellow River Delta region ( Qu et al, 2020 ). Nitrogen addition stimulates plant growth and microbial decomposition in nitrogen-limited environments, thereby influencing soil microbial communities and plant decomposition patterns, ultimately affecting soil organic carbon retention ( Frey et al, 2013 ).…”

Section: Discussionsupporting

confidence: 88%

Indirect influence of soil enzymes and their stoichiometry on soil organic carbon response to warming and nitrogen deposition in the Tibetan Plateau alpine meadow

Xuemei,

Kejia,

Weishan

et al. 2024

Front. Microbiol.

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Despite extensive research on the impact of warming and nitrogen deposition on soil organic carbon components, the response mechanisms of microbial community composition and enzyme activity to soil organic carbon remain poorly understood. This study investigated the effects of warming and nitrogen deposition on soil organic carbon components in the Tibetan Plateau alpine meadow and elucidated the regulatory mechanisms of microbial characteristics, including soil microbial community, enzyme activity, and stoichiometry, on organic carbon components. Results indicated that both warming and nitrogen deposition significantly increased soil organic carbon, readily oxidizable carbon, dissolved organic carbon, and microbial biomass carbon. The interaction between warming and nitrogen deposition influenced soil carbon components, with soil organic carbon, readily oxidizable carbon, and dissolved organic carbon reaching maximum values in the W0N32 treatment, while microbial biomass carbon peaked in the W3N32 treatment. Warming and nitrogen deposition also significantly increased soil Cellobiohydrolase, β-1,4-N-acetylglucosaminidase, leucine aminopeptidase, and alkaline phosphatase. Warming decreased the soil enzyme C: N ratio and C:P ratio but increased the soil enzyme N:P ratio, while nitrogen deposition had the opposite effect. The bacterial Chao1 index and Shannon index increased significantly under warming conditions, particularly in the N32 treatment, whereas there were no significant changes in the fungal Chao1 index and Shannon index with warming and nitrogen addition. Structural equation modeling revealed that soil organic carbon components were directly influenced by the negative impact of warming and the positive impact of nitrogen deposition. Furthermore, warming and nitrogen deposition altered soil bacterial community composition, specifically Gemmatimonadota and Nitrospirota, resulting in a positive impact on soil enzyme activity, particularly soil alkaline phosphatase and β-xylosidase, and enzyme stoichiometry, including N:P and C:P ratios. In summary, changes in soil organic carbon components under warming and nitrogen deposition in the alpine meadows of the Tibetan Plateau primarily depend on the composition of soil bacterial communities, soil enzyme activity, and stoichiometric characteristics.

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Section: Discussionsupporting

confidence: 88%

Indirect influence of soil enzymes and their stoichiometry on soil organic carbon response to warming and nitrogen deposition in the Tibetan Plateau alpine meadow

Xuemei,

Kejia,

Weishan

et al. 2024

Front. Microbiol.

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“…Four empty jars were set up as negative controls to minimize system errors of measurement. In this study, the rate of SOC decomposition was the sum of the total rate of CH 4 -C emissions and CO 2 -C emissions (Qu et al, 2020):…”

Section: Soil Sampling and Incubationmentioning

confidence: 99%

“…There is mounting evidence that soil moisture controls soil microbial growth and further impacts carbon (C) balance in a variety of ecosystems, including forests and grasslands (Lindroth et al, 1998;Craine & Gelderman, 2011). Coastal wetlands are reported as one of the most productive ecosystems with large C stocks and sediment stabilization (Bridgham et al, 2006;Qu et al, 2020). However, the impacts of soil moisture on soil organic carbon (SOC) decomposition and dynamics of soil C storage remain largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Short-term effects of soil moisture on soil organic carbon decomposition in a coastal wetland of the Yellow River Delta

Wang

et al. 2020

Hydrobiologia

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Soil moisture remarkably influences soil organic carbon (SOC) decomposition and is one of the key variables in ecological models influencing changes in soil carbon (C) storage. However, the mechanisms determining the impact of soil moisture on SOC decomposition in coastal wetlands are poorly understood. We collected and incubated soil samples from a coastal wetland of the Yellow River Delta, China, to investigate the response of SOC decomposition (the sum of CO 2 -C and CH 4 -C) to soil moisture. Soil samples were incubated at 20%, 60%, 100%, 140% and 180% water holding capacity (WHC), respectively. Compared to drought condition (20% WHC), moist (60% and 100% WHC) and flooding (140% and 180% WHC) conditions were observed with significantly higher SOC decomposition, explained by increased soil microbial biomass and altered soil physical parameters (pH and electronic conductivity (EC)). Excluding the effect of drought, we found decreased SOC decomposition with increased microbial biomass in flooding conditions compared to moist conditions. Structural equation modeling analysis showed that SOC decomposition and soil C storage were associated with changes in soil environment and soil microbial biomass resulted from soil moisture variation. This study highlights the importance of soil moisture in soil carbon dynamics, which is enlightening for the evaluation of soil C cycling with a decline of soil moisture under a warmer climate in coastal wetlands.

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“…For example, some studies indicated that the N addition level regulated the DOC or DON concentrations in forest soils (Jing et al, 2021; Yuan et al, 2022). Fang et al (2014) and Qu et al (2020) reported that N addition form significantly changed the DOC concentration in an alpine meadow and a coastal wetland, respectively. The geographical environment also controlled the N addition influence on soil DOC concentration in forest and grassland ecosystems (Tang et al, 2019; Widdig et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Influence mechanisms of N addition on the concentration of soil dissolved organic matter in China

Shi

Yang

et al. 2023

Land Degrad Dev

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Soil dissolved organic matter (DOM) plays a critical role in regulating the cycling of terrestrial biogeochemistry. However, the influence mechanisms of nitrogen (N) addition on soil DOM concentration are not well understood at the regional scale. We performed a meta‐analysis of 1004 paired observations from 115 literature to explore how N addition affected the soil DOM concentration, including dissolved organic carbon (DOC) and nitrogen (DON), in China. Overall, N addition markedly stimulated the soil DOC and DON concentrations by 5.2% and 33.1%, respectively. This implied that the stimulation by increased N availability than the suppression by decreased soil pH played a more important role in the soil DOM concentration under N addition. The N addition level showed a significantly positive correlation with the soil DOC and DON concentrations under N addition. The N addition influence on soil DOC concentration was decreased along with the increase in initial soil total nitrogen (TN). This demonstrated the microbial N mining theory in the low N soils and the stoichiometric decomposition theory in the high N soils at the regional scale. The mean annual precipitation (MAP) potentially facilitated the leaching out of soil DON and displayed a negative impact on the soil DON concentration under N addition. The increased soil depth and initial soil pH depressed the soil DOC concentration whereas stimulated the soil DON concentration under N addition. This indicated that DOC mostly accumulated in the top soil and DON largely leached to the deep soil. And the initial soil pH with high value perhaps promoted the uptake of DOC for microbes and the solubility of DON, and thus resulted in the opposite influences on the soil DOC and DON concentrations. Our study provided a mechanistic understanding on N addition influence on the C and N dynamics of terrestrial ecosystem at the regional scale.

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Nitrogen input in different chemical forms and levels stimulates soil organic carbon decomposition in a coastal wetland

Cited by 25 publications

References 72 publications

Indirect influence of soil enzymes and their stoichiometry on soil organic carbon response to warming and nitrogen deposition in the Tibetan Plateau alpine meadow

Indirect influence of soil enzymes and their stoichiometry on soil organic carbon response to warming and nitrogen deposition in the Tibetan Plateau alpine meadow

Short-term effects of soil moisture on soil organic carbon decomposition in a coastal wetland of the Yellow River Delta

Influence mechanisms of N addition on the concentration of soil dissolved organic matter in China

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