Environmental Control of Root Exudation of Low-Molecular Weight Organic Acids in Tropical Rainforests View Full Text


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Article Info

DATE

2012-11

AUTHORS

Maya Aoki, Kazumichi Fujii, Kanehiro Kitayama

ABSTRACT

The availability of phosphorus (P) can limit net primary production (NPP) in tropical rainforests growing on highly weathered soils. Although it is well known that plant roots release organic acids to acquire P from P-deficient soils, the importance of organic acid exudation in P-limited tropical rainforests has rarely been verified. Study sites were located in two tropical montane rainforests (a P-deficient older soil and a P-rich younger soil) and a tropical lowland rainforest on Mt. Kinabalu, Borneo to analyze environmental control of organic acid exudation with respect to soil P availability, tree genus, and NPP. We quantified root exudation of oxalic, citric, and malic acids using in situ methods in which live fine roots were placed in syringes containing nutrient solution. Exudation rates of organic acids were greatest in the P-deficient soil in the tropical montane rainforest. The carbon (C) fluxes of organic acid exudation in the P-deficient soil (0.7 mol C m−2 month−1) represented 16.6% of the aboveground NPP, which was greater than those in the P-rich soil (3.1%) and in the lowland rainforest (4.7%), which exhibited higher NPP. The exudation rates of organic acids increased with increasing root surface area and tip number. A shift in vegetation composition toward dominance by tree species exhibiting a larger root surface area might contribute to the higher organic acid exudation observed in P-deficient soil. Our results quantitatively showed that tree roots can release greater quantities of organic acids in response to P deficiency in tropical rainforests. More... »

PAGES

1194-1203

References to SciGraph publications

  • 2007-05. Production of dissolved organic carbon and low-molecular weight organic acids in soil solution driven by recent tree photosynthate in BIOGEOCHEMISTRY
  • 1983-02. The acquisition of phosphorus byLupinus albus L. in PLANT AND SOIL
  • 2004-04. Rapid development of phosphorus limitation in temperate rainforest along the Franz Josef soil chronosequence in OECOLOGIA
  • 2010-09. Biodegradation of low molecular weight organic compounds and their contribution to heterotrophic soil respiration in three Japanese forest soils in PLANT AND SOIL
  • 1998-08. Organic acids in the rhizosphere – a critical review in PLANT AND SOIL
  • 1999-02. Structure, composition and species diversity in an altitude-substrate matrix of rain forest tree communities on Mount Kinabalu, Borneo in PLANT ECOLOGY
  • 2007-11. Soil Organic Phosphorus Transformations During Pedogenesis in ECOSYSTEMS
  • 2000-05. Soil phosphorus fractionation and phosphorus-use efficiencies of tropical rainforests along altitudinal gradients of Mount Kinabalu, Borneo in OECOLOGIA
  • 1994-12. Differences between calcifuge and acidifuge plants in root exudation of low-molecular organic acids in PLANT AND SOIL
  • 1999-03. A test of a potential short cut in the nitrogen cycle: The role of exudation of symbiotically fixed nitrogen from the roots of a N-fixing tree and the effects of increased atmospheric CO2 and temperature in PLANT AND SOIL
  • 2011-04. Nitrogen and phosphorus retranslocation and N:P ratios of litterfall in three tropical plantations: luxurious N and efficient P use by Acacia mangium in PLANT AND SOIL
  • 2004-05. Soil Phosphorus Fractionation and Phosphorus-Use Efficiency of a Bornean Tropical Montane Rain Forest During Soil Aging With Podozolization in ECOSYSTEMS
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s10021-012-9575-6

    DOI

    http://dx.doi.org/10.1007/s10021-012-9575-6

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    48 schema:description The availability of phosphorus (P) can limit net primary production (NPP) in tropical rainforests growing on highly weathered soils. Although it is well known that plant roots release organic acids to acquire P from P-deficient soils, the importance of organic acid exudation in P-limited tropical rainforests has rarely been verified. Study sites were located in two tropical montane rainforests (a P-deficient older soil and a P-rich younger soil) and a tropical lowland rainforest on Mt. Kinabalu, Borneo to analyze environmental control of organic acid exudation with respect to soil P availability, tree genus, and NPP. We quantified root exudation of oxalic, citric, and malic acids using in situ methods in which live fine roots were placed in syringes containing nutrient solution. Exudation rates of organic acids were greatest in the P-deficient soil in the tropical montane rainforest. The carbon (C) fluxes of organic acid exudation in the P-deficient soil (0.7 mol C m−2 month−1) represented 16.6% of the aboveground NPP, which was greater than those in the P-rich soil (3.1%) and in the lowland rainforest (4.7%), which exhibited higher NPP. The exudation rates of organic acids increased with increasing root surface area and tip number. A shift in vegetation composition toward dominance by tree species exhibiting a larger root surface area might contribute to the higher organic acid exudation observed in P-deficient soil. Our results quantitatively showed that tree roots can release greater quantities of organic acids in response to P deficiency in tropical rainforests.
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