Determining the potential sources of water that eventually become organic matter that make up the bulk of tree biomass has been facilitated by using the stable isotope composition of waters. Until recently these water sources were thought to only be taken up by roots from soils and other subsurface reservoirs. However, there is a growing body of evidence that now shows that water taken up directly by leaves and stems can not only be significant but can also dominate as the water source used in organic matter synthesis. In this commentary, I review and discuss these issues and point to an important paper by Akira Kagawa in this issue of Tree Physiology that provides a new experimental method and some striking evidence that foliar water uptake can be the primary water source that makes up tree biomass.
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| http://dx.doi.org/10.1093/treephys/tpac109 | DOI Listing |
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