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首页> 外文期刊>Environmental Science & Technology >Soil Phosphate Stable Oxygen Isotopes across Rainfall and Bedrock Gradients
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Soil Phosphate Stable Oxygen Isotopes across Rainfall and Bedrock Gradients

机译：降雨和基岩坡度上的土壤磷酸盐稳定氧同位素

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摘要

The stable oxygen isotope compositions of soil phosphate (δ~(18)O_p) were suggested recently to be a tracer of phosphorus cycling in soils and plants. Here we present a survey of bioavailable (resin-extractable or resin-P) inorganic phosphate δ~(18)O_p across natural and experimental rainfall gradients, and across soil formed on sedimentary and igneous bedrock. In addition, we analyzed the soil HCl-extractable inorganic δ~(18)O_p, which mainly represents calcium-bound inorganic phosphate. The resin-P values were in the range 14.5-21.2‰. A similar range, 15.6-21.3‰, was found for the HCl-extractable inorganic δ~(18)O_p, with the exception of samples from a soil of igneous origin that show lower values, 8.2-10.9‰, which indicate that a large fraction of the inorganic phosphate in this soil is still in the form of a primary mineral. The available-P δ~(18)O_p values are considerably higher than the values we calculated for extracellular hydrolysis of organic phosphate, based on the known fractionation from lab experiments. However, these values are close to the values expected for enzymatic-mediated phosphate equilibration with soil-water. The possible processes that can explain this observation are (1) extracellular equilibration of the inorganic phosphate in the soil; (2) fractionations in the soil are different than the ones measured at the lab; (3) effect of fractionation during uptake; and (4) a flux of intercellular-equilibrated inorganic phosphate from the soil microbiota, which is considerably larger than the flux of hydrolyzed organic-P.
机译：最近有人提出土壤磷酸盐（δ〜（18）O_p）的稳定氧同位素组成是土壤和植物中磷循环的示踪剂。在这里，我们对自然和实验降雨梯度以及沉积和火成岩基岩上形成的土壤中可利用的（树脂可萃取或树脂-P）无机磷酸盐δ〜（18）O_p进行了调查。此外，我们分析了土壤中可提取HCl的无机δ〜（18）O_p，其主要代表钙结合的无机磷酸盐。树脂-P值在14.5-21.2‰范围内。 HCl可萃取的无机δ〜（18）O_p的范围相似，为15.6-21.3‰，但火成岩土壤样品的样品值较低，为8.2-10.9‰，表明较大。在土壤中的无机磷酸盐的一部分仍然是主要矿物质的形式。根据实验室实验中已知的分馏结果，可用的Pδ〜（18）O_p值大大高于我们为有机磷酸酯的细胞外水解计算的值。但是，这些值接近酶介导的磷酸盐与土壤-水平衡所期望的值。可以解释这一现象的可能过程是：（1）土壤中无机磷酸盐的细胞外平衡； （2）土壤中的分馏与实验室测量的不同； （3）摄取过程中的分馏作用； （4）来自土壤微生物的细胞间平衡的无机磷酸盐的通量，比水解的有机磷的通量大得多。

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  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2156-2162|共7页
  • 作者

    Alon Angert; Tal Weiner; Shunit Mazeh; Marcelo Sternberg;

  • 作者单位

    The Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel;

    The Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel;

    The Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel;

    Department of Molecular Biology & Ecology of Plants, Wise Faculty of Life Sciences, Tel Aviv University, Israel;

  • 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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