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Updated: Jul 12, 2026

Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research
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沉积酸盐方法用于估计古盐度

B W Nelson

    Science (New York, N.Y.)
    |November 17, 1967
    PubMed
    概括

    一种新的古盐度估计方法使用在富含粘土的沉积物中发现的沉积酸盐. 沉积物中的铁酸盐和酸盐比率直接表明过去的水盐度水平.

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    The Phosphorus Cycle01:21

    The Phosphorus Cycle

    Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.