Nitrogen deposition accelerates greenhouse gas emissions at an alpine steppe site on the Tibetan Plateau

Qu, Songbo; Xu-Ri, --; Yu, Jiaoneng; Li, Fengzi; Wei, Da; Borjigidai, Almaz

doi:10.1016/j.scitotenv.2020.144277

Cited by 17 publications

(4 citation statements)

References 41 publications

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“…Once the N addition level is higher than the local N cr , plant N retention and C gain will reach its maximum value. In previous study, for the alpine steppe, when the N addition level is higher than N cr level (which is about 4 g N m −2 yr −1 ), ANPP will reach a maximum, and ecosystems will be saturated, inorganic N will be accumulated 38,55 , the C and N mineralization rate will reach the maximum 12 , the ecosystems function might even turn from a C sink to source 12 . Therefore, it is quite crucial to constrain the reasonable N application level in the grassland restoration management to avoid the soil N pollution and keeping the C sink function for the alpine grassland.…”

Section: Discussionmentioning

confidence: 88%

“…Under N limitation, N addition promoted the function of C and N absorption in grassland 11 , 15 . N application exceeding grassland carrying capacity will reduce grassland biodiversity and may reverse grassland C sink function 12 , 16 , alter species composition, groundwater resources and threaten ecological security 20 . Therefore, a better understanding of N retention capacity in plant pool and reasonable assessment of N cr is important for ecosystem.…”

Section: Discussionmentioning

confidence: 99%

“…Changes in ecological conditions caused by N deposition may exert an important influence on ecosystem properties and biogeochemical cycling. For instance, N deposition promotes the uptake and assimilation of atmospheric CO 2 by plants, accelerates the release of greenhouse gases, and affects nitrification and denitrification [11][12][13] . As defined by nutrient limitation, an ecosystem is limited if N addition leading to the increase of biomass or the rate of biological processes 14 .…”

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confidence: 99%

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Plant nitrogen retention in alpine grasslands of the Tibetan Plateau under multi-level nitrogen addition

Xu-Ri

et al. 2023

Sci Rep

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Nitrogen (N) deposition might alleviate degradation of alpine grassland caused by N limitation on the Tibetan Plateau (TP). To determine such limitation and quantify the N-induced N retention in plant, a six-year fertilization experiment with six levels of N addition rates (0, 1, 2, 4, 8 and 16 g N m−2 yr−1) was conducted in the Namco alpine steppe and additional 89 experiments with multi-level N addition were also synthesized worldwide among which 27 sites were on the TP. In general, N addition promoted N retention in plants, and this increasing trend diminished at the critical N rate (Ncr). The maximum N retention capacity (MNRC) of plants at Ncr was strongly correlated with initial aboveground net primary productivity with a slope of 0.02, and the MNRC of grasslands globally ranged from 0.35 to 42.59 g N m−2 yr−1, approximately account for 39% of Ncr. Tibetan alpine grassland had a low average MNRC (2.24 g N m−2 yr−1) with distinct regional characteristic, which was much lower in the western TP (0.80 g N m−2 yr−1) than the eastern TP (4.10 g N m−2 yr−1). Our results inferred 0.33–1.21 Tg N yr−1 (0.22–0.79 g N m−2 yr−1) can be retained and 5.65–20.11 Tg C yr−1 (3.67–13.06 g C m−2 yr−1) can be gained by Tibetan alpine grasslands under current N deposition level. With the aggravation of N deposition, the alpine steppe ecosystem might continuously absorb N and C until N deposition reaches Ncr.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Plant nitrogen retention in alpine grasslands of the Tibetan Plateau under multi-level nitrogen addition

Xu-Ri

et al. 2023

Sci Rep

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“…It was also found that N addition increased N 2 O emissions by 54.53% in permafrost peatlands [33]. Similarly, Qu et al found that N addition to grasslands on the Tibetan Plateau increased CO 2 emissions by 1.55-22.6% [38]. This is mainly because the low N addition provides additional N for microbial growth, increasing its activity and thus promoting soil respiration [7].…”

Section: Discussionmentioning

confidence: 91%

The Responses of N2O, CO2 Emissions, and Bacterial Communities to Nitrogen Addition in Saline–Alkaline Wetlands of Northeast China

Su,

Liang,

et al. 2023

Atmosphere

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The Zhalong Wetland is impacted by elevated atmospheric nitrogen (N) deposition and N inputs from agricultural fertilization, which in turn affect greenhouse gas (GHG) emissions. It is unclear how N addition affects nitrous oxide (N2O) and carbon dioxide (CO2) emissions in this wetland. Therefore, we conducted a short-term experiment, collecting soil samples from three representative points with different water levels, and five N addition levels (N0 = 0 mg N kg−1, N10 = 10 mg N kg−1, N30 = 30 mg N kg−1, N50 = 50 mg N kg−1, N100 = 100 mg N kg−1) were used to simulate N input. Overall, N2O emissions were significantly increased by N addition. Differently, N addition had a significant suppressive effect on CO2 emissions in high-flooded soils, whereas the highest CO2 emissions were regarded under the N30 treatment in middle-flooded and dry soils. Through Pearson’s correlation analysis, we found a significant positive correlation between N2O emissions and ammonium (NH4+), and CO2 emission was significantly positively correlated with pH and total organic carbon (TOC). Meanwhile, the bacterial community of the soil was analyzed via high-throughput sequencing. The results revealed that N addition was not significantly affecting soil bacterial community structure, while the three points were significantly different. Among them, the relative abundance of the dominant genera of Trichoderma and Pseudomonas were significantly enhanced after N addition. Furthermore, the bacterial communities were found to be significantly correlated with soil pH, TOC, NH4+, and nitrate contents, which affected N2O and CO2 emissions.

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Short-term P addition weakens the positive effects of N addition on CH4 uptake in alpine grasslands of the Qinghai-Tibetan Plateau

Xiao,

Dong,

Shen

et al. 2024

Plant Soil

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Nitrogen deposition accelerates greenhouse gas emissions at an alpine steppe site on the Tibetan Plateau

Cited by 17 publications

References 41 publications

Plant nitrogen retention in alpine grasslands of the Tibetan Plateau under multi-level nitrogen addition

Plant nitrogen retention in alpine grasslands of the Tibetan Plateau under multi-level nitrogen addition

The Responses of N2O, CO2 Emissions, and Bacterial Communities to Nitrogen Addition in Saline–Alkaline Wetlands of Northeast China

Short-term P addition weakens the positive effects of N addition on CH4 uptake in alpine grasslands of the Qinghai-Tibetan Plateau

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