Effects of nitrogen application to phosphorous forms and acid phosphatase activity (APA) in soils of Acaica mangium plantation and Imperata cylindrica grassland

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  • Acacia mangium植林地土壌ならびにImperata cylindrica草原土壌への窒素添加がリンの存在形態ならびに酸性ホスファターゼ活性に及ぼす影響
  • Effects of nitrogen application to phosphorous forms and acid phosphatase activity (APA) in soils of Acacia mangium plantation and Imperata cylindrica grassland

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Abstract

Nitrogen (N)-rich high quality litter of leguminous tree may enhance the phosphorus (P) availability in a soil via the enhanced activity of microorganisms. We conducted sequential P extraction and incubation experiments with N and carbon (C) application using soils from an Acacia mangium plantation and an Imperata cylindrica grassland. We extracted inorganic P(Pi) and organic P(Po) with water on anion exchange resin (resin-P), NaHCO_3(NaHCO_3-P), NaOH(NaOH-P), and HCl(HCl-P) in this sequence, and total P. Available P (resin-P + NaHCO_3-Pi) and organic P accounted for 4%-6% and 35%-45% of total P, respectively, in both soils. The differences in P fractions between the soils of different vegetations were unclear, and each fraction was significantly affected by the clay content of the soil. In an in vitro incubation experiment, acid phosphatase activity(APA) was higher in acacia soils than in grassland soils and further increased in acacia soil with N application. This suggests the soils in N fixing trees like acacia have higher APA due to continuous input of N rich litter and might have higher potential to acquire P even under P-limited soil condition in the tropics.

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