Long-term alfalfa (Medicago sativa L.) establishment could alleviate phosphorus limitation induced by nitrogen deposition in the carbonate soil
Song, Xin (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Fang, Chao (Nanjing University of Information Science and Technology. School of Applied Meteorology)
Yuan, Ziqiang (Lanzhou University. College of Ecology)
Li, Fengmin (Lanzhou University. College of Ecology)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2022
Resum:	Phosphorus (P) limitation is a widespread problem of primary production in dryland submitted to persistent nitrogen (N) deposition. The legume alfalfa (Medicago sativa L. ), which can fix N2, might potentially strengthen P limitation in dryland ecosystems and is widely distributed as forage. However, there is still unclear how alfalfa grassland mobilizes the soil P to meet its demand. In this experiment, alfalfa introduction was used for long-term revegetation to evaluate the P uptake of plants from deep soil an $9 opend assess the P limitation induced by N deposition compared with fallow. Our results showed that alfalfa introduction increased the soil P storage significantly at 0-2. 4 m soil depth (+0. 74 Mg ha-1), whereas it decreased at 2. 4-4. 8 m soil depth (-0. 21 Mg ha-1) after 15-year establishment. Alfalfa establishment increased soil organic P concentration (180. 9 mg kg-1 vs. 67. 2 mg kg-1) and its relative contribution to total P (19. 64% vs. 8. 08%) at 0-4. 8 m. Alfalfa establishment also increased the concentration and proportion of labile and intermediate P fractions at 0-4. 8 m (9. 12 mg kg-1 vs. 6. 87 mg kg-1, 1. 12% vs. 0. 98%; 16. 06 mg kg-1 vs. 8. 39 mg kg-1, 1. 69% vs. 1. 17%). Alfalfa introduction decreased the concentrated HCl-Pi (250. 66 mg kg-1 vs. 229. 32 mg kg-1, 36. 81% vs. 28. 91%) in 2. 4-4. 8 m soil depth. These results indicated that the deep root system of alfalfa grassland could promote the P mobilization from deep to shallow soil. The concentrated HCl-Pi may be the main potential P source of alfalfa from 2. 4-4. 8 m to 0-2. 4 m of soil depth, and long-term establishment of alfalfa can alleviate P limitation caused by N deposition in carbonate soil. Our results suggested that species with deep roots (such as alfalfa) could be selected as an economical way to mitigate nitrogen deposition in drylands.
Ajuts:	Agencia Estatal de Investigación PID2019-110521GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1005
Nota:	Altres ajuts: Fundación Ramón Areces grant ELEMENTAL-CLIMATE
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Nitrogen deposition ; Phosphorus limitation ; Legume introduction ; Plant-climate interactions ; Hedley fraction
Publicat a:	Journal of environmental management, Vol. 324 (December 2022) , art. 1163462022, ISSN 1095-8630

DOI: 10.1016/j.jenvman.2022.116346

Postprint 36 p, 1.0 MB

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