Rainfall-associated chronic N deposition induces higher soil N2O emissions than acute N inputs in a semi-arid grassland

Shi, Yujie; Wang, Junfeng; Li, Yanan; Zhang, Jinwei; Ao, Yunna; Guo, Zhihan; Mu, Chunsheng; Roux, Xavier Le

doi:10.1016/j.agrformet.2021.108434

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…In contrast to previous work reporting that changes in rainfall frequency modified N 2 O emissions (Gao et al, 2018), we found no main effect of rainfall frequency on N 2 O emissions, which was consistent with our previous study in the same grassland (Shi et al, 2021). This is likely a consequence of the drying-rewetting cycles being frequent, even for the lowest rainfall frequency (25, 48, and 73 cycles over the growing season for F −50% , F ck , and F +50% , respectively), and because rainfall frequency had no main effect on soil NO − 3 and WFPS.…”

Section: Main Effects Of Rainfall Amount Rainfall Frequency and N Deposition On Soil N 2 O Emissionssupporting

confidence: 89%

Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

Shi

Wang

et al. 2021

Global Change Biology

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Global change factors such as changed rainfall regimes and nitrogen (N) deposition contribute to increases in the emission of the greenhouse gas nitrous oxide (N2O) from the soil. In previous research, N deposition has often been simulated by using a single or a series of N addition events over the course of a year, but wet N deposition actually co‐occurs with rainfall. How soil N2O emissions respond to altered rainfall amount and frequency, wet N deposition, and their interactions is still not fully understood. We designed a three‐factor, fully factorial experiment with factors of rainfall amounts (ambient, −30%) rainfall frequency (ambient, ±50%) and wet N deposition (with/without) co‐occurring with rainfall in semi‐arid grassland mesocosms, and measured N2O emissions and their possible biotic and abiotic drivers. Across all treatments, reduced rainfall amount and N deposition increased soil N2O emissions by 35% and 28%, respectively. A significant interactive effect was observed between rainfall amount and N deposition, and to a lesser extent between rainfall frequency and N deposition. Without N deposition, reduced rainfall amount and altered rainfall frequency indirectly affected soil N2O emissions by changing the abundance of nirK and soil net N mineralization, and the changes in nirK abundance were indirectly driven by soil N availability rather than directly by soil moisture. With N deposition, both the abundance of nirK and the level of soil water‐filled pore space contributed to changes in N2O emissions in response to altered rainfall regimes, and the changes in the abundance of nirK were indirectly driven by plant N uptake and nitrifier (ammonia‐oxidizing bacteria) abundance. Our results imply that unlike wetter grassland ecosystems, reduced precipitation may increase N2O emissions, and N deposition may only slightly increase N2O emissions in arid and semi‐arid N‐limited ecosystems that are dominated by grasses with high soil N uptake capacity.

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Section: Main Effects Of Rainfall Amount Rainfall Frequency and N Deposition On Soil N 2 O Emissionssupporting

confidence: 89%

Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

Shi

Wang

et al. 2021

Global Change Biology

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“…A similar phenomenon was found by Sternberg et al (1999) in a calcareous grassland under rainfall reduction. Moreover, L. chinensis had a high efficiency of soil inorganic N, a higher plant N content would reduce soil N 2 O emission under rainfall reduction (Shi, Wang, Li, et al, 2021).…”

Section: Pathways Of Soil N Transformation Rates In Response To Rainf...mentioning

confidence: 99%

The Responses of Soil Nitrogen Transformations to Rainfall Reduction Mainly Occurred in the Early Growing‐Season in a Temperate Meadow

Yang,

Sternberg,

Song

et al. 2024

JGR Biogeosciences

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Drought is expected to increase in temperate regions in the coming decades due to global climate change and will strongly affect nitrogen (N) transformation and balance. However, the underlying mechanisms (soil microenvironment vs. biotic community) of rainfall reduction induced changes in soil N transformation rates, and whether the responses of soil N transformation rates to rainfall reduction vary over time remains poorly understood. In this study, we experimentally examined rainfall reduction effects on soil N transformation rates over two (the second and third experimental years) growing‐seasons in a temperate meadow. We applied four treatments: ambient rainfall, 30%, 50%, and 70% reduction in rainfall. Our findings demonstrated that, 70% rainfall reduction significantly decreased the average net N mineralization and nitrification rates by 68.4% and 72.0%, respectively. Soil nitrous oxide emission was profoundly varied between the experimental years, with it was sensitive no only to changes in annual precipitation amount, but also to seasonal distribution, the highest emissions appeared at the early growing‐season. Moreover, plant diversity, microbial biomass, and soil NO3−‐N content mainly regulated soil N transformation rates in response to rainfall reduction in the greater annual precipitation year; but soil N transformation rates were mainly controlled by soil water content in the less annual precipitation year. We suggest that to accurately project future ecosystem functions and improving the prediction of N cycling responses to changing precipitation patterns, stronger focus should be allocated not only to changes in precipitation amounts, but also to inter‐ and intra‐annual differences in precipitation distribution.

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Productivity of Leymus chinensis grassland is co-limited by water and nitrogen and resilient to climate change

Shi

Sun

et al. 2022

Plant Soil

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Rainfall-associated chronic N deposition induces higher soil N2O emissions than acute N inputs in a semi-arid grassland

Cited by 4 publications

References 36 publications

Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

The Responses of Soil Nitrogen Transformations to Rainfall Reduction Mainly Occurred in the Early Growing‐Season in a Temperate Meadow

Productivity of Leymus chinensis grassland is co-limited by water and nitrogen and resilient to climate change

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Rainfall-associated chronic N deposition induces higher soil N2O emissions than acute N inputs in a semi-arid grassland

Cited by 4 publications

References 36 publications

Responses of soil N2O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

Responses of soil N2O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

The Responses of Soil Nitrogen Transformations to Rainfall Reduction Mainly Occurred in the Early Growing‐Season in a Temperate Meadow

Productivity of Leymus chinensis grassland is co-limited by water and nitrogen and resilient to climate change

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Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland

Responses of soil N₂O emissions and their abiotic and biotic drivers to altered rainfall regimes and co‐occurring wet N deposition in a semi‐arid grassland