|DOI / URL
||Three-dimensional visualization and quantification of water content in the rhizosphere
||Moradi, A.B.; Carminati, A.; Vetterlein, D.; Vontobel, P.; Lehmann, E.; Weller, U.; Vogel, H.-J.; Oswald, S.E.;
|Journal / Serie
||extent of rhizosphere; modelling; neutron tomography; rhizosphere hydraulic properties; root water uptake; soil moisture profile; water distribution
the importance of rhizosphere properties for water flow from soil to
roots, there is limited quantitative information on the distribution of
water in the rhizosphere of plants.
- Here, we used neutron tomography to quantify and visualize the water content in the rhizosphere of the plant species chickpea (Cicer arietinum), white lupin (Lupinus albus), and maize (Zea mays) 12 d after planting.
clearly observed increasing soil water contents (θ) towards the root
surface for all three plant species, as opposed to the usual assumption
of decreasing water content. This was true for tap roots and lateral
roots of both upper and lower parts of the root system. Furthermore,
water gradients around the lower part of the roots were smaller and
extended further into bulk soil compared with the upper part, where the
gradients in water content were steeper.
the hydraulic conductivity and water retention parameters of the
rhizosphere into our model, we could simulate the gradual changes of θ
towards the root surface, in agreement with the observations. The
modelling result suggests that roots in their rhizosphere may modify the
hydraulic properties of soil in a way that improves uptake under dry
|Moradi, A.B., Carminati, A., Vetterlein, D., Vontobel, P., Lehmann, E., Weller, U., Vogel, H.-J., Oswald, S.E. (2011):
Three-dimensional visualization and quantification of water content in the rhizosphere
New Phytol. 192 (3), 653 - 663