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001020588 005__ 20240226075312.0
001020588 0247_ $$2doi$$a10.5194/egusphere-egu23-12018
001020588 037__ $$aFZJ-2024-00283
001020588 1001_ $$0P:(DE-Juel1)129425$$avan Dusschoten, Dagmar$$b0$$eCorresponding author
001020588 1112_ $$aEGU General Assembly 2023$$cVienna$$d2023-04-24 - 2023-04-29$$gEGU23$$wAustria
001020588 245__ $$aRoot water uptake in relation to plant transpiration
001020588 260__ $$c2023
001020588 3367_ $$033$$2EndNote$$aConference Paper
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001020588 520__ $$aTypically, root water uptake (RWU or Utot) is said to be driven by transpiration (Tr). It is however more accurate to state that transpiration causes a reduction in leaf water content that reduces the leaf water potential such that a water potential gradient builds up between leafs and soil water, such that water can be extracted from the soil. For herbaceous plants, the amount of water that is hereby lost is typically assumed to be negligible so the plant can be treated as a resistive system. In how far this is true is open to discussion as quantifying shoot water changes is not easily feasible, especially when the soil-root system is drying out. A balance cannot observe water moving between the soil and the shoot and shoots have empty spaces such that 3D cameras provide an incomplete picture. Shoot weight determination requires that the amount of soil water is independently assessed to discriminate between the two pools of water. This can be achieved when a balance is combined with a Soil Water Profiler (SWaP) on the same soil-plant system. The precision of the SWaP is comparable to that of an expensive balance (<10mg for a 6kg system). Here we performed experiments with the SWaP – balance combination under modulated light with progressive soil dehydration for sunflower and faba beans (N=4). Our data shows that transpiration precedes Utot by about 5 to 10 mins under wet conditions (pF<2.5) and Utot can exceed Tr by up to 20%. Gradually, with decreasing soil water content we find that Utot becomes smaller than Tr and at the same time the delay between Tr and Utot increases. For pF>3 most of the transpired water stems from the shoot, not from root water uptake, indicating that Tr is a poor proxy for RWU for pot experiments where soil is drying at a rate of ~5% per day at well watered conditions. This is very important for calculations of root conductance during drying scenarios. We found significant differences between sunflower sensitivity to soil drying as compared to faba beans that are somewhat more sensitive. We also present data that shows that the delay between Tr and local water uptake is rather dependent on depth and not so much dependent on local pF, which is typically lower for shallow sections of the pot. This may potentially be explained by loss of root water when Tr increases with light, analogous to shoot water losses, as the soil dries.
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001020588 65027 $$0V:(DE-MLZ)SciArea-160$$2V:(DE-HGF)$$aBiology$$x0
001020588 65017 $$0V:(DE-MLZ)GC-2004-2016$$2V:(DE-HGF)$$aBasic research$$x0
001020588 7001_ $$0P:(DE-Juel1)131784$$aPflugfelder, Daniel$$b1$$ufzj
001020588 7001_ $$aKochs, Johannes$$b2
001020588 773__ $$a10.5194/egusphere-egu23-12018
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001020588 9141_ $$y2023
001020588 920__ $$lno
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