Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau

Hu, Yigang; Chang, Xiaofeng; Lin, Xiaogang; Wang, Yanfen; Wang, Shiping; Duan, Jianan; Zhang, Zhenhua; Yang, Xiaoxia; Luo, Caiyun; Xu, Guangping; Zhao, Xinquan

doi:10.1016/j.soilbio.2010.02.011

Cited by 107 publications

(56 citation statements)

References 76 publications

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“…Increased soil N 2 O flux following thawing has been observed in cropland (Rochette et al, 2010), grassland (Virkajärvi et al, 2010), forest , marsh (Yu et al, 2007), alpine meadow (Hu et al, 2010), and alpine tundra (Brooks et al, 1997). Laboratory incubation experiments showing similar results have been performed with agricultural (Kurganova et al, 2004), grassland , forest (Goldberg et al, 2008), permafrost (Elberling et al, 2010), and coastal Antarctica soils (Zhu et al, 2009).…”

Section: Nitrous Oxidementioning

confidence: 75%

Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

et al. 2012

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Abstract. The rewetting of dry soils and the thawing of frozen soils are short-term, transitional phenomena in terms of hydrology and the thermodynamics of soil systems. The impact of these short-term phenomena on larger scale ecosystem fluxes is increasingly recognized, and a growing number of studies show that these events affect fluxes of soil gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ammonia (NH3) and nitric oxide (NO). Global climate models predict that future climatic change is likely to alter the frequency and intensity of drying-rewetting events and thawing of frozen soils. These future scenarios highlight the importance of understanding how rewetting and thawing will influence dynamics of these soil gases. This study summarizes findings using a new database containing 338 studies conducted from 1956 to 2011, and highlights open research questions. The database revealed conflicting results following rewetting and thawing in various terrestrial ecosystems and among soil gases, ranging from large increases in fluxes to non-significant changes. Studies reporting lower gas fluxes before rewetting tended to find higher post-rewetting fluxes for CO2, N2O and NO; in addition, increases in N2O flux following thawing were greater in warmer climate regions. We discuss possible mechanisms and controls that regulate flux responses, and recommend that a high temporal resolution of flux measurements is critical to capture rapid changes in gas fluxes after these soil perturbations. Finally, we propose that future studies should investigate the interactions between biological (i.e., microbial community and gas production) and physical (i.e., porosity, diffusivity, dissolution) changes in soil gas fluxes, apply techniques to capture rapid changes (i.e., automated measurements), and explore synergistic experimental and modelling approaches.

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Section: Nitrous Oxidementioning

confidence: 75%

Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

et al. 2012

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“…Grazing is the dominant land use for the alpine ecosystems on the plateau. Grazing was found to significantly stimulate N 2 O emission by 31 % from an alpine meadow on the plateau (Hu et al 2010). Therefore, after seasonal or inter-annual drainage, more easily grazing for livestock is believed to stimulate N 2 O fluxes from wetlands on the plateau.…”

Section: Discussionmentioning

confidence: 99%

“…This high N 2 O emission in 2006 is also partly due to the accelerated degradation of accumulated organic maters (peat) in the fen when soil aeration increase during the drought (Gorham 1991;Prieme and Christensen 2001). During the drought-induced drainage in 2006, this fen was more available for grazing livestock which increased nitrogen input through dung and urine, resulting in an additional increase in N 2 O emissions (Cardenas et al 2007;Lin et al 2009;Hu et al 2010). In 2007, however, normal precipitation raised the water table from the drought-induced low level.…”

Section: Discussionmentioning

confidence: 99%

“…Over the past five decades, QTP has undergone a universal and significant warming (Yao et al 1997;Liu and Chen 2000;Duan et al 2006;Li et al 2010). Warming was found to significantly increase N 2 O emission by 57.8 % from an alpine meadow on the plateau (Hu et al 2010). With increasing climate warming and extreme climate events, wetlands on QTP have continued to be drier or even vanished from 1967 to 2004 (Zhang et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Though there are several studies about N 2 O fluxes from alpine meadows on the plateau (Pei et al 2003;Lin et al 2009;Hu et al 2010;Jiang et al 2010;Kato et al 2011), only one short-time study was about N 2 O fluxes from littoral marshes (Chen et al 2011). Therefore, to get a whole picture about N 2 O fluxes from wetlands on the QTP, we chose a typical open fen to study its spatial, seasonal, and inter-annual variations of N 2 O fluxes, and to find the key factors controlling such variations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spatiotemporal Variations in Nitrous Oxide Emissions from an Open Fen on the Qinghai–Tibetan Plateau: a 3-Year Study

Chen

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et al. 2012

Water Air Soil Pollut

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Experimental warming increased soil nitrogen sink in the Tibetan permafrost

Chang

Wang

Yang

et al. 2017

J. Geophys. Res. Biogeosci.

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In permafrost soil, warming regulates the nitrogen (N) cycle either by stimulating N transformation or by enhancing cryoturbation, the mixture of soil layers due to repeated freeze thaw. Here N isotopic values (δ15N) of plants and the soil were investigated in a 7 year warming experiment in a permafrost‐affected alpine meadow on the Qinghai‐Tibetan Plateau. The results revealed that warming significantly decreased the δ15N in the plant (aboveground and belowground parts) and different soil fractions (clay and silt fraction, aggregate, and bulk soil). The decreased soil δ15N was associated with an increase in soil N stock due to greater N fixation. The incremental N retention in plants and soil mineral‐associated fractions from warming resulted in a decrease in soil inorganic N, which constrains the role of nitrification/denitrification in soil δ15N, suggesting a restrained rather than an open N cycle. Furthermore, enhanced cryoturbation under warming, identified by a downward redistribution of 137Cs into deeper layers, promoted N protection from transformation. Overall, the decrease in soil δ15N indicated higher rates of N input through fixation relative to N loss through nitrification and denitrification in permafrost‐affected ecosystems under warming conditions.

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Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau

Cited by 107 publications

References 76 publications

Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research

Spatiotemporal Variations in Nitrous Oxide Emissions from an Open Fen on the Qinghai–Tibetan Plateau: a 3-Year Study

Experimental warming increased soil nitrogen sink in the Tibetan permafrost

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