Differential response of microbial respiration to supplied nitrogen forms in 3 contrasting alpine meadow soils on the Tibetan Plateau

Zeng, Xin-Min

doi:10.1590/1678-4499.139

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Then, CO 2 emissions decreased after 48 h of incubation from 3% to 57% in the soils without N and 4% to 58% with N (data not shown). In the absence of plant roots as in this study, the variation of CO 2 emission has been attributed to heterotrophic respiration due to microbial biological activity (Oyonarte et al, 2012;Zhao et al, 2016), which decreases with reduced concentration of C source from organic matter in the soil (Zeng, 2017). According to Ramesh et al (2012), the greater the CO 2 emission is, the greater the biological activity and the SOM loss are.…”

Section: Discussionmentioning

confidence: 63%

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Pupin

Rangel

Nahas

2018

Zemdirbyste-Agriculture

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The carbon dioxide (CO 2) efflux from various terrestrial ecosystems under various moisture contents provides a good understanding of the carbon cycle. The aim of this study was to evaluate the impact of extreme moisture content in the presence and absence of nitrogen (N) fertilizer application on CO 2 efflux (ECO 2) from forest and annual crop soils. The clay (forest (F) soil) and sandy loam (annual crop (AC) soil) with or without Rhodic Ferrasol (FR-ro) N fertilizer application were incubated under increasing concentrations of water corresponding to 40-700% of the water retention capacity (WRC). Even with the same classification, the two soils presented particular chemical and physical characteristics, probably due to the conversion of the forest area to agriculture in the AC soil. In all assays, the most ECO 2 was found at 24 h soil incubation period. After 24 h of incubation, ECO 2 diminished, and the decreased ECO 2 was found in annual crop AC 700 1 (incubated for 1728 h in 60, 80, 100, 150, 200, 300, 500 and 700 % WRC) soil. The effect of WRC varied between soils during all incubation periods. The highest ECO 2 was found in annual crop AC 200 (incubated for 144 h in 50, 75, 100, 150 and 200 % WRC) and AC 700 (incubated for 144 h in 60, 100, 150, 200, 300 and 700 % WRC) soils with 100% and 60% WRC, respectively. No effect on microbial respiratory activity by the N addition in the soil was found. In waterlogged soils or soils subject to the increased amount of water contents, incubation time and moisture concentration are two important factors that influence ECO 2 .

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Section: Discussionmentioning

confidence: 63%

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Pupin

Rangel

Nahas

2018

Zemdirbyste-Agriculture

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“…Baseline biochemical and physicochemical properties were then determined. The remainder of each composite sample was stored in separate containers and left to settle in the dark for 1 week at 15 • C (Zeng, 2017;Comeau et al, 2018;Randle-Boggis et al, 2018).…”

Section: Soil Samplingmentioning

confidence: 99%

An Assessment of Climate Induced Increase in Soil Water Availability for Soil Bacterial Communities Exposed to Long-Term Differential Phosphorus Fertilization

et al. 2020

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The fate of future food productivity depends primarily upon the health of soil used for cultivation. For Atlantic Europe, increased precipitation is predicted during both winter and summer months. Interactions between climate change and the fertilization of land used for agriculture are therefore vital to understand. This is particularly relevant for inorganic phosphorus (P) fertilization, which already suffers from resource and sustainability issues. The soil microbiota are a key indicator of soil health and their functioning is critical to plant productivity, playing an important role in nutrient acquisition, particularly when plant available nutrients are limited. A multifactorial, mesocosm study was established to assess the effects of increased soil water availability and inorganic P fertilization, on spring wheat biomass, soil enzymatic activity (dehydrogenase and acid phosphomonoesterase) and soil bacterial community assemblages. Our results highlight the significance of the spring wheat rhizosphere in shaping soil bacterial community assemblages and specific taxa under a moderate soil water content (60%), which was diminished under a higher level of soil water availability (80%). In addition, an interaction between soil water availability and plant presence overrode a long-term bacterial sensitivity to inorganic P fertilization. Together this may have implications for developing sustainable P mobilization through the use of the soil microbiota in future. Spring wheat biomass grown under the higher soil water regime (80%) was reduced compared to the constant water regime (60%) and a reduction in yield could be exacerbated in the future when grown in cultivated soil that have been fertilized with inorganic P. The potential feedback mechanisms for this need now need exploration to understand how future management of crop productivity may be impacted.

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The response of soil respiration to different N compounds addition in a saline–alkaline grassland of northern China

Diao

Chen

Wang

et al. 2022

Journal of Plant Ecology

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Aims The increase in atmospheric nitrogen (N) deposition has profound effects on soil respiration (SR). However, the responses of SR to the addition of different N compounds, particularly in saline-alkaline grasslands remain unclear. Methods A 3-year controlled field experiment was conducted to investigate the responses of SR to different N compounds (NH4NO3, (NH4)2SO4, and NH4HCO3) during the growing seasons in a saline-alkaline grassland located in the agro-pastoral ecotone of northern China. Important Findings Our results demonstrated that SR showed a bimodal pattern and a significant inter-annual difference that was regulated by air or soil temperature and precipitation. Nitrogen addition had a significant effect on SR, and the effect of N addition on SR varied yearly, which was related to seasonal precipitation. The mean SR across three years (2017-2019) was increased by 19.9%, 13.0%, and 16.6% with the addition of NH4NO3, (NH4)2SO4, and NH4HCO3, respectively. The highest effect of NH4NO3 addition on SR across three years was ascribed to the highest above-ground net primary production, below-ground net primary production (BNPP), and soil NO3 - concentrations. Soil respiration (C loss) was significantly increased while plant productivity (C input) did not significantly change under NH4HCO3 addition, indicating a decrease in C sequestration. In addition, BNPP was the main direct factor influencing SR in this saline-alkaline grassland, and soil salinization (e.g., soil base cations and pH) indirectly affected SR through soil microorganisms. Notably, NH4NO3 addition overestimated the response of SR to N addition, and different N compounds should be considered, especially in saline-alkaline grassland.

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Differential response of microbial respiration to supplied nitrogen forms in 3 contrasting alpine meadow soils on the Tibetan Plateau

Cited by 3 publications

References 20 publications

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

An Assessment of Climate Induced Increase in Soil Water Availability for Soil Bacterial Communities Exposed to Long-Term Differential Phosphorus Fertilization

The response of soil respiration to different N compounds addition in a saline–alkaline grassland of northern China

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