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\hypersetup{pdftitle={The Source of Phosphorus Flushes after Soil Drying and Rewetting in Ferralsol as Revealed by 33p Labeling},pdfauthor={Knut Ehlers, Evelyn Preuss, Andre Bationo, Job Kihara, Astrid Oberson, Emmanuel Frossard, Else Bünemann},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Drying rewetting, ferralsol, Nutrient dynamics, P-33 labeling, Phosphorus},pdfpagemode=None,colorlinks=true}
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\begin{document}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\begin{center}
\Large{\textbf{The Source of Phosphorus Flushes after Soil Drying and Rewetting in Ferralsol as Revealed by 33p Labeling\footnote{\textbf{Contact Address:} Knut Ehlers, ETH Zurich, Agricultural and Food Sciences, Zürich, Switzerland, \mbox{e-mail}: \email{knut.ehlers@ipw.agrl.ethz.ch}}\\[0.8ex]}}
\normalsize{\textsc{Knut Ehlers$^{1}$, Evelyn Preuss$^{2}$, Andre Bationo$^{3}$, Job Kihara$^{4}$, Astrid Oberson$^{5}$, Emmanuel Frossard$^{6}$, Else Bünemann$^{7}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$ETH Zurich, Agricultural and Food Sciences, Switzerland}}}
\item[]{\small{\textit{$^{2}$Philipps-university Marburg, Geography, }}}
\item[]{\small{\textit{$^{3}$Alliance for a Green Revolution in Africa (AGRA), }}}
\item[]{\small{\textit{$^{4}$International Center for Tropical Agriculture (CIAT), Tropical Soil Biology and Fertility (TSBF), Kenya}}}
\item[]{\small{\textit{$^{5}$ETH Zurich, Switzerland}}}
\item[]{\small{\textit{$^{6}$ETH Zurich, Institute of Plant, Animal and Agroecosystem Sciences, Switzerland}}}
\item[]{\small{\textit{$^{7}$ETH Zurich, Agricultural and Food Sciences, Switzerland}}}
\end{itemize*}
\index[author]{Ehlers, Knut}
\index[author]{Preuss, Evelyn}
\index[author]{Bationo, Andre}
\index[author]{Kihara, Job}
\index[author]{Oberson, Astrid}
\index[author]{Frossard, Emmanuel}
\index[author]{Bünemann, Else}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Drying and rewetting (DRW) of soil is an important factor influencing soil phosphorus (P) dynamics and might be especially meaningful in the tropics as climatic conditions are likely to favour DRW events. We investigated the impact of DRW on three soil P pools (available inorganic P, microbial P, and NaOH extractable inorganic P) in a Kenyan Ferralsol as affected by amendments with inorganic P or carbon substrates with ample nitrogen (CN). Soil was carrier free labeled with $^{33}$Pin treatments without nutrient addition and with CN addition. In the other case the $^{33}$P was added together with the inorganic P addition. Soils were analysed at three points in time (before drying, 1 h after rewetting, 1 week after rewetting). While P addition mainly increased the inorganic P status of the soil, CN addition led to an increase in microbial P and a decrease in available inorganic P. A P flush as indicated by an increase in available inorganic P appeared 1 h after rewetting always in conjunction with a decrease in microbial P. Isotopic composition of available inorganic P and microbial P was similar and differed from the isotopic composition in the other investigated P pools. As the isotopic composition in available inorganic P was not affected by DRW, the source of the P flush must have had a similar isotopic composition. Altogether, our findings suggest that the P flush after DRW is derived from a release of microbial P after rewetting. One week after rewetting the P flush had disappeared while the microbial P pool had not recovered. We assume that the P flush was sorbed to soil particles. Overall, DRW led to a significant short term increase in available P and might be an important factor for the redistribution of immobilised microbial P into inorganic P.}

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\noindent \textbf{Keywords:} Drying rewetting, ferralsol, Nutrient dynamics, P-33 labeling, Phosphorus
\index[key]{Drying rewetting}
\index[key]{Ferralsol}
\index[key]{Nutrient!dynamics}
\index[key]{P-33 labeling}
\index[key]{Phosphorus}
\end{document}