Distribution and chemical species of phosphorus across density fractions in Andisols of contrasting mineralogy
Distribution and chemical species of phosphorus across density fractions in Andisols of contrasting mineralogy
复制标题
对比矿物学的安迪土中不同密度分数的磷分布和化学形态
DOI：
10.1016/j.geoderma.2021.115080
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发表时间：
2021
期刊：
影响因子：
6.1
通讯作者：
R Wagai
中科院分区：
文献类型：
--
作者：
A Takamoto;Y Hashimoto;M Asano;K Noguchi;R Wagai
Strong control of iron (Fe) and aluminum (Al) phases on soil phosphorus (P) dynamics is well established. How organic and inorganic P forms are associated with Fe and Al phases remains poorly understood, and sequential density fractionation thus allows one to assess the soil continuum from organic-rich particles (< 1.8 g cm−3) to organo-mineral particles (1.8–2.25 g cm−3), and finally to mineral rich particles (> 2.25 g cm−3). We combined the density fractionation approach with wet extraction techniques,31P NMR spectroscopy and X-ray absorption near-edge structure (XANES) spectroscopy to investigate the distribution and chemical species of P in relation to Fe and Al phases for two Andisols: an allophanic Andisol rich in short-range-order aluminosilicates (silandic) and a non-allophanic Andisol rich in organic matter (OM) and organo-aluminum complexes (aluandic). We fractionated the soils to the density classes of 1.6–1.8, 1.8–2.0, 2.0–2.25, 2.25–2.5, and > 2.5 g cm−3using the sodium polytungstate solutions. Across five density fractions, inorganic and total P were distributed in low tomeso-density fractions (1.6–2.25 g cm−3) where major portions of extractable Fe and Al were found. The major P pool was found in the NaOH extraction step for low- tomeso-density ranges (< 2.25 g cm−3), suggesting that Al and Fe (oxyhydr)oxides and aluminosilicates have significant roles in P sorption in allophanic and non-allophanic Andisols. In contrast, the residual P remaining after the sequential extraction was predominant in heavier-density fractions (> 2.25 g cm−3). Molybdate-reactive and total P extracted by NaOH in the density fractions were positively correlated with oxalate extractable Al (Alox) in the allophanic Andisol (r> 0.91) and with pyrophosphate extractable Al (Alp) in the non-allophanic Andisol (r> 0.97), suggesting stronger control of Al phases to P over Fe phases. The non-destructive XANES analysis confirmed that P in both Andisols was associated primarily with Al, not Fe, and suggested the presence of P bound to organo-Al complexes in the non-allophanic Andisol (up to 76% of P in the 1.6–1.8 g cm−3fraction where Alpis enriched). Solution31P NMR spectra of NaOH-EDTA soil extracts showed that the primary organic P group was phosphomonoesters that decreased with increasing density in allophanic and non-allophanic Andisols.Myo-inositol hexakisphosphate (IHP) andscyllo-IHP were identified in a density fraction between 1.8 and 2.25 g cm−3of non-allophanic Andisol. Our study highlights the importance of low- tomeso-density fractions in organic and inorganic P reservoirs in Andisols.
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