期刊
CATENA
卷 210, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.catena.2021.105887
关键词
Nitrogen loss; Nitrogen retention; Nitrogen addition; Phosphorus addition; Ammonia volatilization; Nitrous oxide
资金
- Second Tibetan Plateau Scientific Expedition and Research Program [2019QZKK0307]
- National Science Foundation of China [U20A2007-01]
- Key R&D Program of Qinghai Province [2019-SF-145, 2018-NK-A2]
- Qinghai innovation platform construction project [2017-ZJ-Y20]
This study investigated the effects of nitrogen (N) and phosphorus (P) addition on alpine grasslands and found that P addition increased N retention by promoting plant N uptake. Meanwhile, N addition had a neutral effect on N retention, but increased gaseous losses of N. Nitrogen loss through NH3 volatilization and N2O emissions was quite low, indicating that gaseous loss was not a significant pathway of N loss in alpine grassland ecosystems.
Nitrogen (N) and phosphorus (P) are common limiting nutrients affecting plant growth in alpine ecosystems. Anthropogenic activities significantly increase N input in ecosystems, thereby increasing P limitation when in excess. The increase of N input and P limitation may affect N retention, which is a critical ecosystem function. To understand how ecosystem N retention and N loss respond to N and P addition, this study investigated the effects of N and P addition on NH3 volatilization, N2O emissions, and N pools of plants and soil in two alpine grasslands (alpine meadow and alpine steppe). The results showed that P addition (with or without N) increased N retention, mainly by promoting plant N uptake, underlining the importance of P availability in N retention in the QTP alpine grassland ecosystems while increasing N deposition. N addition without P showed neutral effects of N retention of plant, soil and microbes, and N addition (with or without P) showed positive effects on gaseous losses of N. N loss through NH3 volatilization and N2O emissions was quite low (less than 1%), suggesting that N gaseous loss was not a significant pathway of N loss from the alpine grassland ecosystems. These results were meaningful for estimating the impacts of N retention and N loss under future N deposition scenarios in alpine grassland ecosystems in the QTP.
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