Precipitation overrides warming in mediating soil nitrogen pools in an alpine grassland ecosystem on the Tibetan Plateau

NWIPB OpenIR

	Precipitation overrides warming in mediating soil nitrogen pools in an alpine grassland ecosystem on the Tibetan Plateau
	Lin, Li ; Zhu, Biao ; Chen, Chengrong ; Zhang, Zhenhua ; Wang, Qi-Bing ; He, Jin-Sheng
	2016-08-16
发表期刊	SCIENTIFIC REPORTS
摘要	Soils in the alpine grassland store a large amount of nitrogen (N) due to slow decomposition. However, the decomposition could be affected by climate change, which has profound impacts on soil N cycling. We investigated the changes of soil total N and five labile N stocks in the topsoil, the subsoil and the entire soil profile in response to three years of experimental warming and altered precipitation in a Tibetan alpine grassland. We found that warming significantly increased soil nitrate N stock and decreased microbial biomass N (MBN) stock. Increased precipitation reduced nitrate N, dissolved organic N and amino acid N stocks, but increased MBN stock in the topsoil. No change in soil total N was detected under warming and altered precipitation regimes. Redundancy analysis further revealed that soil moisture (26.3%) overrode soil temperature (10.4%) in explaining the variations of soil N stocks across the treatments. Our results suggest that precipitation exerted stronger influence than warming on soil N pools in this mesic and high-elevation grassland ecosystem. This indicates that the projected rise in future precipitation may lead to a significant loss of dissolved soil N pools by stimulating the biogeochemical processes in this alpine grassland.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/38257
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Lin, Li,Zhu, Biao,Chen, Chengrong,et al. Precipitation overrides warming in mediating soil nitrogen pools in an alpine grassland ecosystem on the Tibetan Plateau[J]. SCIENTIFIC REPORTS,2016.
APA	Lin, Li,Zhu, Biao,Chen, Chengrong,Zhang, Zhenhua,Wang, Qi-Bing,&He, Jin-Sheng.(2016).Precipitation overrides warming in mediating soil nitrogen pools in an alpine grassland ecosystem on the Tibetan Plateau.SCIENTIFIC REPORTS.
MLA	Lin, Li,et al."Precipitation overrides warming in mediating soil nitrogen pools in an alpine grassland ecosystem on the Tibetan Plateau".SCIENTIFIC REPORTS (2016).