Soil Properties Affecting Phosphorus Forms and Phosphatase Activities in Japanese Forest Soils: Soil Microorganisms May Be Limited by Phosphorus
Soil Properties Affecting Phosphorus Forms and Phosphatase Activities in Japanese Forest Soils: Soil Microorganisms May Be Limited by Phosphorus
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DOI：
10.1097/ss.0b013e3182378153
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发表时间：
2012-01-01
期刊：
影响因子：
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通讯作者：
Saeki, Kazutoshi
中科院分区：
文献类型：
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作者：
Kunito, Takashi;Tsunekawa, Makiko;Saeki, Kazutoshi
为了探索土壤微生物过程中可能存在的磷限制，我们通过依次提取H(2)O、0.5M NaHCO3、0.1MNaOH、1MHCl和COCC中的无机P(PI)和有机P(Po)，对日本森林土壤(10个先知素、3个不透性阳离子、7个非阳离子阳离子和1个Spodosol)中的磷进行了分级。HCl组分和残渣组分中的全磷。在所有土壤类型中，NaOH-Pi和NaOH-Po组分是最大的P组分。除H(2)O-PI、NaOH-PI和NaOH-Po外，各组分的P含量在不同土壤类型间差异不显著。H(2)O-Pi、H(2)O-Po、0.1M NaOH-Pi、0.1M NaOH-Po和残留态P与活性Al呈正相关，与活性Fe无相关性，表明Al对土壤P形态的控制作用更为显著。速效P(H(2O)O+NaHCO3-P)占全P的比例与土壤中活性Al、Fe含量和土壤pH呈负相关。高的磷酸单酯酶和磷酸二酯酶是土壤磷有效性低的指标，在本研究中，这两种酶的活性在低有效磷的土壤中都较高，这表明这些森林土壤的微生物可能是磷有限的。
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 H(2)O, 0.5 M NaHCO(3), 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 H(2)O-Pi, NaOH-Pi, and NaOH-Po, P concentration in each fraction did not differ significantly among soil types. Concentrations of P in fractions H(2)O-Pi, H(2)O-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 (H(2)O + NaHCO(3) - 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.