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Differential responses and mechanistic controls of soil phosphorus transformation in Eucalyptus plantations with N fertilization and introduced N2‐fixing tree species.
- Source :
-
New Phytologist . Mar2023, Vol. 237 Issue 6, p2039-2053. 15p. - Publication Year :
- 2023
-
Abstract
- Summary: Introducing N2‐fixing tree species into Eucalyptus plantations could replace nitrogen (N) fertilization to maintain high levels of N consumption and productivity. However, N enrichment may exacerbate phosphorus (P) limitation as Eucalyptus robusta Smith is extensively planted in P‐poor tropical and subtropical soils.We conducted a field experiment in a pure plantation of Eucalyptus urophylla × grandis to investigate the impacts of N fertilization and introduced an N2‐fixing tree of Dalbergia odorifera T. Chen on soil P transformation.Nitrogen fertilization significantly enhanced soil occluded P pool and reduced the other P pools due to acidification‐induced pH‐sensitive geochemical processes, lowering Eucalyptus leaf P concentration with higher N : P ratio. By contrast, introduced N2‐fixing tree species did not change soil pH, labile inorganic P pool, and Eucalyptus leaf N : P ratio, even enhanced organic P pools and reduced occluded P pool probably due to altering microbial community composition particularly stimulating arbuscular mycorrhiza fungal abundance.Our results revealed differential responses and mechanistic controls of soil P transformation in Eucalyptus plantations with N fertilization and introduced N2‐fixing tree species. The dissolution of occluded P pool along with organic P accumulation observed in the mixed plantations may represent a promising future to better manage soil P availability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0028646X
- Volume :
- 237
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- New Phytologist
- Publication Type :
- Academic Journal
- Accession number :
- 161968142
- Full Text :
- https://doi.org/10.1111/nph.18673