Soluble reactive phosphorus (SRP) concentrations in wetland surface waters were measured during laboratory incubations in the presence of wetland soils and Typha leaf litter. Aerated water columns above intact soil cores increased in SRP concentration (up to 73 µg L−1) over 28 days, whereas the water column in cores containing soil and a Typha litter layer showed no concentration increase (remained < 5 µg SRP L−1). In the absence of soil, phosphorus (P) uptake by leaf litter and associated microbial biomass occurred rapidly under oxic conditions (max. 24-hr. uptake, 524 ± 90 µg P g−1 dry litter d−1), but uptake was slower and less complete under hypoxic conditions. At the highest tested initial P concentration of 1 mg L−1, P uptake by litter under hypoxic conditions (< 0.5 mg O2 L−1) was 41% of the oxic rate, or 216 ± 42 µg P g−1 dry litter d−1. Differences between hypoxic and oxic P uptake rates, however, were not observed at initial SRP concentrations of 100 µg L−1 or less. Our results suggest that leaf litter may be important to mitigating soil P release.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 28 • No. 3