חיפוש מתקדם
Ecohydrology
Klein, T., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Rotenberg, E., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Cohen-Hilaleh, E., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Raz-Yaseef, N., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel, Department of Environmental Science, Policy and Management, UC Berkeley, Berkeley, CA, United States
Tatarinov, F., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Preisler, Y., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Ogée, J., INRA, UR1263 EPHYSE, F-33140, Villenave d'Ornon, France
Cohen, S., Institute of Soil, Water and Environmental Sciences, Volcani Center ARO, Beit Dagan, Israel
Yakir, D., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Knowledge of the relationship between soil water dynamics and tree water use is critical to understanding forest response to environmental change in water-limited ecosystems. However, the dynamics in soil water availability for tree transpiration (Tt) cannot be easily deduced from conventional measurements of soil water content (SWC), notably because Tt is influenced by soil water potential (Ψs) that, in turn, depends on soil characteristics. Using tree sap flow and water potential and deriving depth-dependent soil water retention curves, we quantified the 'transpirable soil water content' (tSWC) and its seasonal and inter-annual variations in a semi-arid Pinus halepensis forest. The results indicated that tSWC varied in time and with soil depth. Over one growing season Tt was 57% of rain and 72% of the infiltrated SWC. In early winter, Tt was exclusively supported by soil moisture at the top 10cm (tSWC=11mm), whereas in spring (tSWC>18mm) and throughout the dry season, source water for Tt shifted to 20-40cm, where the maximum fine root density occurs. Simulation with the soil-plant-atmosphere water and energy transport model MuSICA supported the idea that consistent tSWC at the 20-40cm soil layer critically depended on limited water infiltration below 40cm, because of high water retention below this depth. Quantifying tSWC is critical to the precise estimation of the onset and termination of the growing season (when tSWC>0) in this semi-arid ecosystem. © 2013 John Wiley & Sons, Ltd.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Quantifying transpirable soil water and its relations to tree water use dynamics in a water-limited pine forest
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Klein, T., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Rotenberg, E., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Cohen-Hilaleh, E., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Raz-Yaseef, N., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel, Department of Environmental Science, Policy and Management, UC Berkeley, Berkeley, CA, United States
Tatarinov, F., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Preisler, Y., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Ogée, J., INRA, UR1263 EPHYSE, F-33140, Villenave d'Ornon, France
Cohen, S., Institute of Soil, Water and Environmental Sciences, Volcani Center ARO, Beit Dagan, Israel
Yakir, D., Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Quantifying transpirable soil water and its relations to tree water use dynamics in a water-limited pine forest
Knowledge of the relationship between soil water dynamics and tree water use is critical to understanding forest response to environmental change in water-limited ecosystems. However, the dynamics in soil water availability for tree transpiration (Tt) cannot be easily deduced from conventional measurements of soil water content (SWC), notably because Tt is influenced by soil water potential (Ψs) that, in turn, depends on soil characteristics. Using tree sap flow and water potential and deriving depth-dependent soil water retention curves, we quantified the 'transpirable soil water content' (tSWC) and its seasonal and inter-annual variations in a semi-arid Pinus halepensis forest. The results indicated that tSWC varied in time and with soil depth. Over one growing season Tt was 57% of rain and 72% of the infiltrated SWC. In early winter, Tt was exclusively supported by soil moisture at the top 10cm (tSWC=11mm), whereas in spring (tSWC>18mm) and throughout the dry season, source water for Tt shifted to 20-40cm, where the maximum fine root density occurs. Simulation with the soil-plant-atmosphere water and energy transport model MuSICA supported the idea that consistent tSWC at the 20-40cm soil layer critically depended on limited water infiltration below 40cm, because of high water retention below this depth. Quantifying tSWC is critical to the precise estimation of the onset and termination of the growing season (when tSWC>0) in this semi-arid ecosystem. © 2013 John Wiley & Sons, Ltd.
Scientific Publication
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