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Natural Colloidal P and Its Contribution to Plant P Uptake

机译：天然胶体磷及其对植物吸收磷的贡献

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摘要

Phosphorus (P) bioavailability depends on its concentration and speciation in solution. Andisols and Oxisols have very low soil solution concentration of free orthophosphate, as they contain high concentrations of strongly P-sorbing minerals (Al/Fe oxyhydroxides, allophanes). Free orthophosphate is the form of P taken up by plants, but it is not the only P species present in the soil solution. Natural colloidal P (P associated with Al, Fe, and organic matter of sizes ranging from 1 to 1000 nm) constitutes an important fraction of soil solution P in these soils; however, its availability has not been considered. We measured the uptake of P by wheat (Triticum aestivum) from radiolabeled nonfiltered (colloid-containing) and 3-kDa filtered (nearly colloid-free) soil-water extracts from Andisols and Oxisols. In the Andisol extracts, P uptake was up to 5-fold higher from the nonfiltered solutions than the corresponding 3-kDa filtered solutions. In the Oxisol extract, no difference in P uptake between both solutions was observed. Also the diffusional flux of P as measured with the DGT technique was larger in the nonfiltered than in the 3-kDa filtered solutions. Our results suggest that colloidal P from Andisols is not chemically inert and contributes to plant uptake of P.
机译：磷（P）的生物利用度取决于其浓度和溶液中的形态。 Andisols和Oxisols的土壤溶液中游离正磷酸盐的浓度非常低，因为它们含有高浓度的强P吸收矿物质（Al / Fe羟基氧化物，Allophanes）。游离正磷酸盐是植物吸收的磷的形式，但它不是土壤溶液中仅有的磷物种。天然胶体P（与Al，Fe和有机物相关的P的尺寸范围为1至1000 nm）构成了这些土壤中土壤溶液P的重要组成部分。但是，尚未考虑其可用性。我们测量了从放射性标记的未过滤的（含胶体的）和3-kDa过滤的（从几乎不含胶体的）土壤中提取的Andisols和Oxisols对小麦（Triticum aestivum）对P的吸收。在Andisol提取物中，未过滤溶液中的P吸收量是相应的3 kDa过滤溶液中P吸收量的最高5倍。在Oxisol提取物中，两种溶液之间的P吸收均无差异。同样，用DGT技术测得的P的扩散通量在未过滤的溶液中要比在3-kDa过滤的溶液中大。我们的结果表明，Andisols的胶体P不是化学惰性的，并且有助于植物吸收P。

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  • 来源
    《Environmental Science & Technology》 |2015年第6期|3427-3434|共8页
  • 作者

    Daniela Montalvo; Fien Degryse; Mike J. McLaughlin;

  • 作者单位

    Soil Science, School of Agriculture Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia 5064, Australia,CSIRO Sustainable Agriculture Flagship, CSIRO Land and Water, PMB 2, Glen Osmond, South Australia 5064, Australia;

    Soil Science, School of Agriculture Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia 5064, Australia;

    Soil Science, School of Agriculture Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia 5064, Australia,CSIRO Sustainable Agriculture Flagship, CSIRO Land and Water, PMB 2, Glen Osmond, South Australia 5064, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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