Schedule: summer 2015

UPDATE: this experiment will appear as a paper soon. It is currently in press for publication in the journal Plant and Soil.

iron uptake and allocation in roots and leafs

The soft mud layer covering the lake’s bed is physically and chemically very heterogeneous resulting in different amounts of iron-oxides (Fe-ox) and iron-bound P (Fe-P) at various sites in the lake. For example, in the south, 75 µmol gr Fe-ox is present, while in the north, only 15 µmol gr is present.

These differences will affect plant response as large amounts of Fe-ox (and Fe-P) can form plaques on roots, thereby enhancing uptake of Fe to roots and leafs but hampering that of other (micro)nutrients. In extreme cases, this can even lead to plant death. This so-called iron toxicity effect might be an important process on the future islands of Marker Wadden so studying this effect is important.

In this experiment, we test with four sediment types (containing different amounts of Fe-ox and Fe-P) dredged at different spots in the lake. Moreover, we included three species in the experiment including Common Reed (P. australis), Golden Dock (R. maritimus) and Hemp Agrimony (E. cannabinum). At different time intervals, we harvest the plants and analyze root and leaf tissue to monitor tissue chemistry in terms of Fe and (micro)nutrients.