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 | |
刊名 | SCIENTIFIC REPORTS |
2016 | |
关键词 | MICROBIAL BIOMASS ORGANIC NITROGEN CLIMATE-CHANGE TALLGRASS PRAIRIE NORTHERN CHINA PLANT-GROWTH AMINO-ACIDS SHORT-TERM LAND-USE CARBON |
DOI | 10.1038/srep31438 |
英文摘要 | 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.; National Program on Key Basic Research Project of the Ministry of Science and Technology of the People's Republic of China [2014CB954003, 2014CB954004]; SCI(E); PubMed; ARTICLE; qwang@ibcas.ac.cn; jshe@pku.edu.cn; 31438; 6 |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.pku.edu.cn/handle/20.500.11897/493235] |
专题 | 城市与环境学院 |
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). |
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