Translator Disclaimer
21 February 2019 Impact of Extra Nitrogen on Ecological Stoichiometry of Alpine Grasslands on Tibetan Plateau: Meta-Analysis
Hao Rui Zhang, Wei sun, Shao Wei Li, Fu Song Han, Cheng Qun Yu, Xian Zhou Zhang, Jing Sheng Wang , Yong Tao He, Zhi Ming zhong
Author Affiliations +
Abstract

The general impact of extra nitrogen on ecological stoichiometry was examined in alpine grasslands on the Tibetan Plateau. Extra nitrogen increased the ratio of nitrogen to phosphorus (N:P ratio) in leaves and aboveground parts of plants by 43.4% and 32.7%, respectively. In contrast, extra nitrogen reduced the ratio of carbon to nitrogen (C:N ratio) in leaves by 30.6%. Extra nitrogen decreased soil C:N ratio by 9.1% in alpine meadows, but increased soil C:N ratio by 3.4% in alpine steppes. Extra urea had a stronger positive impact on aboveground vegetation N:P ratio than did extra ammonium nitrate. Extra urea rather than ammonium nitrate decreased aboveground vegetation C:N ratio and soil C:N ratio. The impact of extra nitrogen on aboveground vegetation N:P ratio was positively correlated with latitude, mean annual temperature and precipitation, nitrogen application rate and accumulated amount, but negatively correlated with elevation, duration and aboveground vegetation N:P ratio of the control plots. The impact of extra nitrogen on leaves N:P ratio was positively correlated with nitrogen application rate and accumulated amount. The impact of extra nitrogen on leaves C:N ratio was positively correlated with latitude, but negatively correlated with mean annual temperature and precipitation, nitrogen application rate, accumulated amount, duration and leaves C:N ratio of the control plots. Therefore, nitrogen enrichment caused by human activities will most likely alter element balance and alpine plants from nitrogen limitation to phosphorus limitation. This effect may weaken with time, and increase with climatic warming, increased precipitation and nitrogen input rate.

Hao Rui Zhang, Wei sun, Shao Wei Li, Fu Song Han, Cheng Qun Yu, Xian Zhou Zhang, Jing Sheng Wang , Yong Tao He, and Zhi Ming zhong "Impact of Extra Nitrogen on Ecological Stoichiometry of Alpine Grasslands on Tibetan Plateau: Meta-Analysis," Polish Journal of Ecology 66(4), 315-324, (21 February 2019). https://doi.org/10.3161/15052249PJE2018.66.4.001
Published: 21 February 2019
JOURNAL ARTICLE
10 PAGES


Share
SHARE
KEYWORDS
Alpine region
C:N ratio
C:P ratio
Eutrophication
N:P ratio
nitrogen deposition
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top