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土壤磷的分级分析为选用速效磷的提取方法提供了基础,但分级分析的结果仍然只具有各级磷全含量的观念,而并没有速效含量的观念。要决定哪一种或几种形态的磷对土壤速效磷的贡献最大,还须补充应用其他科学方法。本文中介绍了自六十年代后期直至当前的这方面的研究进展。其中主要包括:(1)分级分析结果与提取测定结果之间的统计相关;(2)分级分析结果与参比标准之间的统计相关;(3)种植作物前后土壤各级磷含量的差减;(4)分级分析与同位素~(32)P平衡法相结合。上述四法各有优缺点;如能四法皆用而得到基本一致的结果,即可据以决定土壤速效磷的主要形态及其最适用的提取方法。
Grading analysis of soil phosphorus provides the basis for the selection of available phosphorus extraction method, but the result of grading analysis still only has the concept of phosphorus content at all levels, and there is no concept of quick-acting content. To determine which one or more forms of phosphorus contribute most to available-available phosphorus, additional scientific methods must be added. This article describes the research progress in this area from the late 1960s until the present. (2) the statistical correlation between the grading analysis results and the reference standard; (3) the difference between the phosphorus content in the soil before and after planting crops ; (4) Hierarchical analysis combined with isotope ~ (32) P balance method. The above four methods each have their own advantages and disadvantages; if all four methods are used to obtain a basically consistent result, the main form of soil available phosphorus and its most suitable extraction method can be determined accordingly.