Impact of Extra Nitrogen on Ecological Stoichiometry of Alpine Grasslands on Tibetan Plateau: Meta-Analysis

IF 0.4 4区 环境科学与生态学 Q4 ECOLOGY Polish Journal of Ecology Pub Date : 2019-02-21 DOI:10.3161/15052249PJE2018.66.4.001
H. Zhang, Wei Sun, Shaowei Li, F. Han, Cheng-qun Yu, X. Zhang, Jing Sheng Wang, Yongtao He, Z. Zhong
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引用次数: 1

Abstract

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.
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额外施氮对青藏高原高山草地生态化学计量的影响:Meta分析
研究了青藏高原高寒草原额外氮对生态化学计量的总体影响。额外施氮使植物叶片和地上部氮磷比分别提高43.4%和32.7%。相比之下,额外的氮使叶片碳氮比(C:N比)降低了30.6%。额外施氮使高寒草甸土壤C:N比降低9.1%,使高寒草原土壤C:N比提高3.4%。额外尿素对地上植被氮磷比的正向影响强于额外硝酸铵。过量施用尿素而非硝酸铵降低了地上植被C:N比和土壤C:N比。额外氮对地上植被氮磷比的影响与纬度、年平均气温和降水量、施氮量和累积量呈正相关,与对照地海拔、持续时间和地上植被氮磷比呈负相关。额外施氮量对叶片氮磷比的影响与施氮量和累积量呈正相关。额外氮对叶片C:N比的影响与纬度呈正相关,与对照区年平均气温和降水量、施氮量、累积量、持续时间和叶片C:N比呈负相关。因此,人类活动引起的氮富集极有可能改变元素平衡,使高山植物从氮限向磷限转变。这种效应可能随着时间的推移而减弱,并随着气候变暖、降水和氮输入量的增加而增强。
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来源期刊
Polish Journal of Ecology
Polish Journal of Ecology 环境科学-生态学
CiteScore
1.10
自引率
0.00%
发文量
9
审稿时长
18-36 weeks
期刊介绍: POLISH JOURNAL OF ECOLOGY (formerly Ekologia polska) publishes original scientific research papers dealing with all aspects of ecology: both fundamental and applied, physiological ecology, evolutionary ecology, ecology of population, community, ecosystem, landscape as well as global ecology. There is no bias regarding taxons, ecosystems or geographical regions.
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