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

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 ...

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Published in:Scientific reports 2023-01, Vol.13 (1), p.877-877, Article 877
Main Authors: Yu, Jiaoneng, Xu-Ri, Qu, Songbo, Li, Fengzi, Wei, Da, Borjigidai, Almaz
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description 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 (N cr ). The maximum N retention capacity (MNRC) of plants at N cr 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 N cr . 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 N cr .
doi_str_mv 10.1038/s41598-023-27392-y
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subjects 704/158/2165
704/158/2453
704/158/853
704/47/4112
Alpine environments
Biomass
Ecosystem
Fertilization
Grassland
Grasslands
Humanities and Social Sciences
multidisciplinary
Nitrogen
Nitrogen - metabolism
Plants - metabolism
Prairies
Retention
Retention capacity
Science
Science (multidisciplinary)
Soil
Steppes
Tibet
title Plant nitrogen retention in alpine grasslands of the Tibetan Plateau under multi-level nitrogen addition
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