Soil Phosphorus Exchange as Affected by Drying-Rewetting of Three Soils From a Hawaiian Climatic Gradient
نویسندگان
چکیده
Current understanding of phosphorus (P) dynamics is mostly based on experiments carried out under steady-state conditions. However, drying-rewetting an inherent feature soil behavior, and as such also impacts P cycling. While several studies have looked at net changes in pool sizes with drying-rewetting, few dynamically tracked exchange using isotopes, which would give insights mean residence times a given pool, thus availability. Here, we subjected three soils from climatic gradient the Kohala peninsula Hawaii to 5-month treatments. The hypotheses were that physico-chemical biotic processes be differently affected by repeated cycles, response depend history soils. Soils labeled 33 18 O enriched water. At select time intervals, sequential extraction measured concentration, recovery (only first 3 months), incorporation water into phosphate. This allowed tracing sequentially extracted pools well phosphate, are driven biological processes. Results showed concentration predominantly type. across all observed faster dilution resin-P less mobile inorganic drying-rewetting. On other hand, phosphate governed treatment. Under considerably was incorporated resin-P, microbial-P HCl-P, suggesting reduced Hence, our results suggest increases while reducing cycling due microbial activity, independent needs considered management ecosystems model representations terrestrial cycle.
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ژورنال
عنوان ژورنال: Frontiers in soil science
سال: 2021
ISSN: ['2673-8619']
DOI: https://doi.org/10.3389/fsoil.2021.738464