NDLI: Soil organic phosphorus in lowland tropical rain forests

Content Provider	Springer Nature Link
Author	Turner, Benjamin L. Engelbrecht, Bettina M. J.
Copyright Year	2010
Abstract	Phosphorus is widely considered to constrain primary productivity in tropical rain forests, yet the chemistry of soil organic phosphorus in such ecosystems remains poorly understood. We assessed the composition of soil organic phosphorus in 19 contrasting soils under lowland tropical forest in the Republic of Panama using NaOH–EDTA extraction and solution 31P nuclear magnetic resonance spectroscopy. The soils spanned a strong rainfall gradient (1730–3404 mm y−1) and contained a wide range of chemical properties (pH 3.3–7.0; total carbon 2.8–10.4%; total phosphorus 74–1650 mg P kg−1). Soil organic phosphorus concentrations ranged between 22 and 494 mg P kg−1 and were correlated positively with total soil phosphorus, pH, and total carbon, but not with annual rainfall. Organic phosphorus constituted 26 ± 1% (mean ± STD error, n = 19) of the total phosphorus, suggesting that this represents a broad emergent property of tropical forest soils. Organic phosphorus occurred mainly as phosphate monoesters (68–96% of total organic phosphorus) with smaller concentrations of phosphate diesters in the form of DNA (4–32% of total organic phosphorus). Phosphonates, which contain a direct carbon–phosphorus bond, were detected in only two soils (3% of the organic phosphorus), while pyrophosphate, an inorganic polyphosphate with a chain length of two, was detected in all soils at concentrations up to 13 mg P kg−1 (3–13% of extracted inorganic phosphorus). Phosphate monoesters were a greater proportion of the total organic phosphorus in neutral soils with high concentrations of phosphorus and organic matter, whereas the proportion of phosphate diesters was greater in very acidic soils low in phosphorus and organic matter. Most soils did not contain detectable concentrations of either myo- or scyllo-inositol hexakisphosphate, which is in marked contrast to many temperate mineral soils that contain abundant inositol phosphates. We conclude that soil properties exert a strong control on the amounts and forms of soil organic phosphorus in tropical rain forests, but that the proportion of the total phosphorus in organic forms is relatively insensitive to variation in climate and soil properties. Further work is now required to assess the contribution of soil organic phosphorus to the nutrition and diversity of plants in these species-rich ecosystems.
Starting Page	297
Ending Page	315
Page Count	19
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	103
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-30
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	DNA Inositol phosphate Lowland tropical forest Panama Phosphate diesters Phosphate monoesters Soil organic phosphorus Solution 31P NMR spectroscopy Ecosystems Life Sciences Environmental Chemistry Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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