Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types
We used concurrent measurements of soil water content and soil water potential (Ψsoil) to assess the effects of Ψsoil on uptake and hydraulic redistribution (HR) of soil water by roots during seasonal drought cycles at six sites characterized by differences in the types and amounts of woody vegetati...
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todo:paper_0829318X_v24_n8_p919_Meinzer2023-10-03T15:40:02Z Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types Meinzer, F.C. Brooks, J.R. Bucci, S. Goldstein, G. Scholz, F.G. Warren, J.M. Coniferous forest Pinus ponderosa Pseudotsuga menziesii Rhizosphere Roots Soil water potential Tropical savanna coniferous forest drought root system soil water potential water availability water uptake water use Abies Pinus ponderosa Pinus ponderosa Pseudotsuga Pseudotsuga menziesii Pseudotsuga menziesii We used concurrent measurements of soil water content and soil water potential (Ψsoil) to assess the effects of Ψsoil on uptake and hydraulic redistribution (HR) of soil water by roots during seasonal drought cycles at six sites characterized by differences in the types and amounts of woody vegetation and in climate. The six sites included a semi-arid old-growth ponderosa pine (Pinus ponderosa Dougl. ex P. Laws & C. Laws) forest, a moist old-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest, a 24-year-old Douglas-fir forest and three Brazilian savanna sites differing in tree density. At all of the sites, HR was confined largely to the upper 60 cm of soil. There was a common threshold relationship between the relative magnitude of HR and Ψsoil among the six study sites. Below a threshold Ψsoil of about -0.4 MPa, overnight recharge of soil water storage increased sharply, and reached a maximum value of 80-90% over a range of Ψsoil from ∼ -1.2 to -1.5 MPa. Although amounts of water hydraulically redistributed to the upper 60 cm of soil were relatively small (0 to 0.4 mm day-1), they greatly reduced the rates of seasonal decline in Ψsoil. The effectiveness of HR in delaying soil drying diminished with increasing sapwood area per ground area. The relationship between soil water utilization and Ψsoil in the 20-60-cm layer was nearly identical for all six sites. Soil water utilization varied with a surrogate measure of rhizosphere conductance in a similar manner at all six sites. The similarities in relationships between Ψsoil and HR, soil water utilization and relative rhizosphere conductance among the six sites, suggests that, despite probable differences in maximum rooting depth and density, there was a convergence in biophysical controls on soil water utilization and redistribution in the upper soil layers where the density of finer roots is greatest. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0829318X_v24_n8_p919_Meinzer |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Coniferous forest Pinus ponderosa Pseudotsuga menziesii Rhizosphere Roots Soil water potential Tropical savanna coniferous forest drought root system soil water potential water availability water uptake water use Abies Pinus ponderosa Pinus ponderosa Pseudotsuga Pseudotsuga menziesii Pseudotsuga menziesii |
| spellingShingle |
Coniferous forest Pinus ponderosa Pseudotsuga menziesii Rhizosphere Roots Soil water potential Tropical savanna coniferous forest drought root system soil water potential water availability water uptake water use Abies Pinus ponderosa Pinus ponderosa Pseudotsuga Pseudotsuga menziesii Pseudotsuga menziesii Meinzer, F.C. Brooks, J.R. Bucci, S. Goldstein, G. Scholz, F.G. Warren, J.M. Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| topic_facet |
Coniferous forest Pinus ponderosa Pseudotsuga menziesii Rhizosphere Roots Soil water potential Tropical savanna coniferous forest drought root system soil water potential water availability water uptake water use Abies Pinus ponderosa Pinus ponderosa Pseudotsuga Pseudotsuga menziesii Pseudotsuga menziesii |
| description |
We used concurrent measurements of soil water content and soil water potential (Ψsoil) to assess the effects of Ψsoil on uptake and hydraulic redistribution (HR) of soil water by roots during seasonal drought cycles at six sites characterized by differences in the types and amounts of woody vegetation and in climate. The six sites included a semi-arid old-growth ponderosa pine (Pinus ponderosa Dougl. ex P. Laws & C. Laws) forest, a moist old-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest, a 24-year-old Douglas-fir forest and three Brazilian savanna sites differing in tree density. At all of the sites, HR was confined largely to the upper 60 cm of soil. There was a common threshold relationship between the relative magnitude of HR and Ψsoil among the six study sites. Below a threshold Ψsoil of about -0.4 MPa, overnight recharge of soil water storage increased sharply, and reached a maximum value of 80-90% over a range of Ψsoil from ∼ -1.2 to -1.5 MPa. Although amounts of water hydraulically redistributed to the upper 60 cm of soil were relatively small (0 to 0.4 mm day-1), they greatly reduced the rates of seasonal decline in Ψsoil. The effectiveness of HR in delaying soil drying diminished with increasing sapwood area per ground area. The relationship between soil water utilization and Ψsoil in the 20-60-cm layer was nearly identical for all six sites. Soil water utilization varied with a surrogate measure of rhizosphere conductance in a similar manner at all six sites. The similarities in relationships between Ψsoil and HR, soil water utilization and relative rhizosphere conductance among the six sites, suggests that, despite probable differences in maximum rooting depth and density, there was a convergence in biophysical controls on soil water utilization and redistribution in the upper soil layers where the density of finer roots is greatest. |
| format |
JOUR |
| author |
Meinzer, F.C. Brooks, J.R. Bucci, S. Goldstein, G. Scholz, F.G. Warren, J.M. |
| author_facet |
Meinzer, F.C. Brooks, J.R. Bucci, S. Goldstein, G. Scholz, F.G. Warren, J.M. |
| author_sort |
Meinzer, F.C. |
| title |
Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| title_short |
Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| title_full |
Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| title_fullStr |
Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| title_full_unstemmed |
Converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| title_sort |
converging patterns of uptake and hydraulic redistribution of soil water in contrasting woody vegetation types |
| url |
http://hdl.handle.net/20.500.12110/paper_0829318X_v24_n8_p919_Meinzer |
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