Equations for Following Nutrient Transformations in Soil, Utilizing Tracer Data

作者：Don Kirkham, W. V. Bartholomew · 发表于：Soil Science Society of America Journal · 年份：1954 · DOI：10.2136/sssaj1954.03615995001800010009x · 被引用次数：677 · 研究领域：Soil Carbon and Nitrogen Dynamics、Crop Yield and Soil Fertility、Earth Systems and Cosmic Evolution

Abstract Theoretical equations are derived, for utilization of tracer data, for determining rates of mineralization m and immobilization i of plant nutrients in soil. The equations for a particular nutrient are urn:x-wiley:03615995:saj2sssaj195403615995001800010009x:equation:saj2sssaj195403615995001800010009x-math-0001 urn:x-wiley:03615995:saj2sssaj195403615995001800010009x:equation:saj2sssaj195403615995001800010009x-math-0002 where m = mass of immobile atoms mineralized per unit time per unit mass of soil (mineralization rate); i = mass of mineral atoms immobilized per unit time per unit mass of soil (immobilization rate); H 0 = mass of tracing (heavy, or radioactive) mineral atoms per unit mass of soil at time t = O; M 0 = mass of tracing, plus non‐tracing mineral atoms per unit mass of soil at time t = O; H = mass of tracing mineral atoms per unit mass of soil at time t = t; M = mass of tracing, plus non‐tracing mineral atoms per unit mass of soil at time t = t; t = time lapsed between measurements for H 0 , M 0 and H, M; log = logarithm to base e or to base 10 for the equations for i ≠ m and to base e for the equation for m = i; e = 2.718. The equations for m and i, and some others which are also given, are all only valid if M 0 and M are small compared to the amount of material which is being mineralized; and if i and m are constant during time t. The equations are applied to some nitrogen transformation data, with heavy nitrogen as the tracing element. The equations may...