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- W4285493931 abstract "Abstract For over a century, deep roots have been assumed to allow trees to avoid competition with grasses (i.e., the two‐layer hypothesis). Yet, in part because it remains difficult to measure water uptake in the field, there has been a shift in savanna ecology away from the two‐layer hypothesis and towards alternative explanations of tree‐grass coexistence. Here, we combine hydrologic tracer experiments and soil water flow models to demonstrate how the distribution of active roots affects water uptake across a range of savanna conditions. Grass roots were shallower and provided pre‐emptive access to enough soil water to allow nearly continuous grass cover, but slightly deeper roots provided trees with more total water under most conditions. This ‘some water now or more water later’ tradeoff varied with precipitation amount, soil texture, and tree and grass relative root abundance in ways that helped explain tree and grass landscape abundance." @default.
- W4285493931 created "2022-07-15" @default.
- W4285493931 creator A5084231616 @default.
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- W4285493931 date "2022-07-14" @default.
- W4285493931 modified "2023-10-01" @default.
- W4285493931 title "A modern two‐layer hypothesis helps resolve the ‘savanna problem’" @default.
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- W4285493931 doi "https://doi.org/10.1111/ele.14067" @default.
- W4285493931 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35834518" @default.
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