Journal article

Authors list: Missong, A; Holzmann, S; Bol, R; Nischwitz, V; Puhlmann, H; von Wilpert, K; Siemens, J; Klumpp, E

Publication year: 2018

Pages: 305-315

Journal: Science of the Total Environment

Volume number: 634

ISSN: 0048-9697

DOI Link: https://doi.org/10.1016/j.scitotenv.2018.03.265

Publisher: Elsevier

Abstract: 
The leaching of P fromthe upper 20 cm of forest topsoils influences nutrient (re-) cycling and the redistribution of available phosphate and organic P forms. However, the effective leaching of colloids and associated P forms from forest topsoils was so far sparsely investigated. We demonstrated through irrigation experiments with undisturbed mesocosm soil columns, that significant proportions of P leached from acidic forest topsoils were associated with natural colloids. These colloids had a maximum size of 400 nm. By means of Field-flow fractionation the leached soil colloids could be separated into three size fractions. The size and composition was comparable to colloids present in acidic forest streams known from literature. The composition of leached colloids of the three size classes was dominated by organic carbon. Furthermore, these colloids contained large concentrations of P which amounted between 12 and 91% of the totally leached P depending on the type of the forest soil. The fraction of other elements leached with colloids ranged between 1% and 25% (Fe: 1-25%; Corg: 3-17%; Al: <4%; Si, Ca, Mn: all <2%). The proportion of colloid-associated P decreased with increasing total P leaching. Leaching of total and colloid-associated P from the forest surface soil did not increase with increasing bulk soil P concentrations and were also not related to tree species. The present study highlighted that colloid-facilitated P leaching can be of higher relevance for the P leaching from forest surface soils than dissolved P and should not be neglected in soil water flux studies. (C) 2018 Elsevier B.V. All rights reserved.

Harvard Citation style: Missong, A., Holzmann, S., Bol, R., Nischwitz, V., Puhlmann, H., von Wilpert, K., et al. (2018) Leaching of natural colloids from forest topsoils and their relevance for phosphorus mobility, Science of the Total Environment, 634, pp. 305-315. https://doi.org/10.1016/j.scitotenv.2018.03.265

APA Citation style: Missong, A., Holzmann, S., Bol, R., Nischwitz, V., Puhlmann, H., von Wilpert, K., Siemens, J., & Klumpp, E. (2018). Leaching of natural colloids from forest topsoils and their relevance for phosphorus mobility. Science of the Total Environment. 634, 305-315. https://doi.org/10.1016/j.scitotenv.2018.03.265