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Soil Properties Affecting Phosphorus Forms and Phosphatase Activities in Japanese Forest Soils: Soil Microorganisms May Be Limited by Phosphorus

Kunito, Takashi1; Tsunekawa, Makiko1; Yoshida, Seishi2; Park, Ho-Dong1; Toda, Hideshige1; Nagaoka, Kazunari3; Saeki, Kazutoshi4

doi: 10.1097/SS.0b013e3182378153
Technical Article

Abstract: To explore a possible phosphorus limitation of soil microbial processes, we fractionated phosphorus in Japanese forest soils (10 Inceptisols, three allophanic Andisols, seven nonallophanic Andisols, and one Spodosol) by sequential extraction into inorganic P (Pi) and organic P (Po) in H2O, 0.5 M NaHCO3, 0.1 M NaOH, 1 M HCl and conc. HCl fractions, and total P in residual fractions. NaOH-Pi and NaOH-Po fractions were the largest P components in all soil types. Apart from H2O-Pi, NaOH-Pi, and NaOH-Po, P concentration in each fraction did not differ significantly among soil types. Concentrations of P in fractions H2O-Pi, H2O-Po, 0.1 M NaOH-Pi, 0.1 M NaOH-Po, and residual P were correlated with active Al, but not with active Fe, indicating a more significant contribution of Al in controlling P forms in the soils. The proportion of available P (H2O + NaHCO3 − P) to total P was negatively affected by active Al and Fe contents and by pH in the soils. High phosphomonoesterase and phosphodiesterase are known to be indicators of low soil P availability, and both activities were higher in soils with low available P in this study, suggesting that microorganisms of these forest soils may be P limited.

1Department of Environmental Sciences, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Japan. Dr. Takashi Kunito is corresponding author. E-mail: kunito@shinshu-u.ac.jp

2Nagano Vegetable and Ornamental Crops Experiment Station, 1066-1 Tokoo, Soga, Shiojiri, Japan.

3Soil Science and Plant Nutrition Division, NARO Agricultural Research Center, 3-1-1 Kannondai, Tsukuba, Japan.

4Biotron Application Center, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, Japan.

Received July 1, 2011.

Accepted for publication September 13, 2011.

Financial Disclosures/Conflicts of Interest: Dr. Kunito received a Grant-in-Aid for Young Scientists (B) (No. 22710007) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. The authors have no conflicts of interest to declare.

© 2012 Lippincott Williams & Wilkins, Inc.