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- W2892411840 abstract "Elevated nitrogen (N) deposition may exacerbate soil phosphorus (P) limitations in P-deficient subtropical forest ecosystems. However, which abiotic factors predominantly contribute to soil P transformations and how plant roots affect soil P variations after N addition in these ecosystems are unclear. To address these issues, we studied a natural Castanopsis carlesii forest in Fujian, China subjected to 3 years of N addition. Soil P fractions, soil properties, iron (Fe) and aluminum (Al) oxides, root biomass (RB), and root length density (RLD) were investigated. The results showed that N application remarkably increased the concentrations of soil available P but significantly decreased content of soil moderately labile P. The quantities of free Fe and Al (Fed and Ald) and organic-bound Fe and Al (Fep and Alp) decreased after N addition. These changes indicated an important relationship between Fe and Al oxides and P fractions, especially Fep and moderately labile P, suggesting that Fe and Al oxides predominantly influenced soil P fractions in N-enriched plots. Meanwhile, RB and RLD were higher after N addition treatments than control treatment. Positive correlations between RB and RLD and P fractions (available P, labile P, and moderately labile P) indicated that plant roots exert an essential influence on changes in soil P fractions. In conclusion, N addition in subtropical forests significantly influenced soil P fractions, primarily by decreasing Fe and Al oxides and increasing plant root biomass and density." @default.
- W2892411840 created "2018-10-05" @default.
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- W2892411840 date "2019-03-01" @default.
- W2892411840 modified "2023-10-15" @default.
- W2892411840 title "Responses of soil phosphorus fractions after nitrogen addition in a subtropical forest ecosystem: Insights from decreased Fe and Al oxides and increased plant roots" @default.
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- W2892411840 doi "https://doi.org/10.1016/j.geoderma.2018.09.028" @default.
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