P and K additions enhance canopy N retention and accelerate the associated leaching

Masaaki Chiwa, Lucy J. Sheppard, Ian D. Leith, Sarah R. Leeson, Y. Sim Tang, J. Neil Cape

研究成果: ジャーナルへの寄稿記事

抄録

This study evaluated the interactive effects of combined phosphorus (P) and potassium (K) additions on canopy nitrogen (N) retention (CNR) and subsequent canopy leaching at a long-term N manipulation site on Whim bog in south Scotland. Ambient deposition is 8 kg N ha −1 year −1 and an additional 8, 24, and 56 kg N ha −1 year −1 of either ammonium (NH 4 + ) or nitrate (NO 3 ) with or without P and K has been applied over 11 years. Throughfall N deposition below Calluna vulgaris and foliar N and P concentrations were assessed. Results showed that 60% for low dose and 53% for high dose of NO 3 contrasting with 80% for low dose and 38% for high dose of NH 4 + onto Calluna was retained by Calluna canopy. The CNR was enhanced by P and K addition in which 84% of NO 3 and 83% of NH 4 + for high dose were retained. CNR for NO 3 increased the canopy leaching of dissolved organic N (DON) and associated organic anions. NH 4 + retention increased canopy leaching of magnesium and calcium through ion exchange. Even over 11-years N exposure without P and K, foliage N:P ratio of Calluna did not increase, suggesting that N exposure did not lead to N saturation of Calluna at Whim bog. Our study concluded that increases in P and K availability enhance CNR of Calluna but accelerate the associated canopy leaching of DON and base cations, depending on foliar N status.

元の言語英語
ページ(範囲)413-423
ページ数11
ジャーナルBiogeochemistry
142
発行部数3
DOI
出版物ステータス出版済み - 2 15 2019

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Leaching
leaching
canopy
bog
Ammonium Compounds
Nitrates
Phosphorus
Magnesium
Anions
Cations
Ion exchange
Potassium
Nitrogen
throughfall
Availability
Calcium
foliage
anion
magnesium
ion exchange

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

これを引用

Chiwa, M., Sheppard, L. J., Leith, I. D., Leeson, S. R., Tang, Y. S., & Cape, J. N. (2019). P and K additions enhance canopy N retention and accelerate the associated leaching. Biogeochemistry, 142(3), 413-423. https://doi.org/10.1007/s10533-019-00543-y

P and K additions enhance canopy N retention and accelerate the associated leaching. / Chiwa, Masaaki; Sheppard, Lucy J.; Leith, Ian D.; Leeson, Sarah R.; Tang, Y. Sim; Cape, J. Neil.

:: Biogeochemistry, 巻 142, 番号 3, 15.02.2019, p. 413-423.

研究成果: ジャーナルへの寄稿記事

Chiwa, M, Sheppard, LJ, Leith, ID, Leeson, SR, Tang, YS & Cape, JN 2019, 'P and K additions enhance canopy N retention and accelerate the associated leaching', Biogeochemistry, 巻. 142, 番号 3, pp. 413-423. https://doi.org/10.1007/s10533-019-00543-y
Chiwa, Masaaki ; Sheppard, Lucy J. ; Leith, Ian D. ; Leeson, Sarah R. ; Tang, Y. Sim ; Cape, J. Neil. / P and K additions enhance canopy N retention and accelerate the associated leaching. :: Biogeochemistry. 2019 ; 巻 142, 番号 3. pp. 413-423.
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abstract = "This study evaluated the interactive effects of combined phosphorus (P) and potassium (K) additions on canopy nitrogen (N) retention (CNR) and subsequent canopy leaching at a long-term N manipulation site on Whim bog in south Scotland. Ambient deposition is 8 kg N ha −1 year −1 and an additional 8, 24, and 56 kg N ha −1 year −1 of either ammonium (NH 4 + ) or nitrate (NO 3 − ) with or without P and K has been applied over 11 years. Throughfall N deposition below Calluna vulgaris and foliar N and P concentrations were assessed. Results showed that 60{\%} for low dose and 53{\%} for high dose of NO 3 − contrasting with 80{\%} for low dose and 38{\%} for high dose of NH 4 + onto Calluna was retained by Calluna canopy. The CNR was enhanced by P and K addition in which 84{\%} of NO 3 − and 83{\%} of NH 4 + for high dose were retained. CNR for NO 3 − increased the canopy leaching of dissolved organic N (DON) and associated organic anions. NH 4 + retention increased canopy leaching of magnesium and calcium through ion exchange. Even over 11-years N exposure without P and K, foliage N:P ratio of Calluna did not increase, suggesting that N exposure did not lead to N saturation of Calluna at Whim bog. Our study concluded that increases in P and K availability enhance CNR of Calluna but accelerate the associated canopy leaching of DON and base cations, depending on foliar N status.",
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