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Sap Flow Comparison

This document details the sap flow analysis from test trees in a phytoremediation area, focusing on metrics such as daily sap flow rates and cross-sectional areas. Measurements indicate that trees remove an average of 11,000 liters of water per hectare per day. The analysis includes calculations of sap flow per land area, crop coefficients, and seasonal water consumption estimations. It highlights the significance of sap flow monitoring in predicting water use and outlines recommendations for future studies to refine groundwater extraction models and evaluate tree groundwater usage.

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Sap Flow Comparison

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  1. Sap Flow Comparison TDPs 12.7 cm diam. Dynagages 5 cm diam. 2.1 cm diam.

  2. Putting It All Together Measure Test Trees Cross-Sectional Areas Sap Flow/Stem Area = 0.203 L/cm2/day Measure Average Daily Sap Flow for Test Trees Indexing to Stand - Trunk Cross-Sectional Area 61.9 cm2 x0.203 L/cm2/day = 12.6 L/day Measure Stand Trees Cross-Sectional Area 705 Trees averaging 61.9 cm2

  3. Putting It All Together (cont.) Sap Flow/Land Area 12.6 L/d x 877 trees = 11,000 L/ha/d (1.1 mm/day) Measure Trees/Land Area 3m x 3m and 6m x 3m result in 877 trees/ha Measure Weather Station ETo 4.4 mm/day Index Sap Flow / ETo = KC Crop Coefficient 1.1 mm/d / 4.4 mm/d = 0.25 Apply Crop Coefficient For Seasonal Water Use Tot. seasonal ET x KC 858 mm x 0.25 = 215 mm (2,150,000 L/ha) The values shown above are averaged from July 23 through August 29, 2004 data. Modified from Dynamax

  4. Conclusions

  5. Conclusions • Sap flow monitoring quantifies and adds confidence to remediation predictions • Trees in X-740 Phytoremediation Area remove 11,000 liters of water/hectare/day (1176 gal/acre/day) • Total water consumption during 2004 growing season is 2,146,000 liters/hectare (229,000 gal/acre) • Results and experience from X-740 may be used to refine assumptions and approach at X-749/X-120 area

  6. Future Work • Continue sap flow monitoring to determine groundwater usage by the trees • Conduct soil boring program to determine root extent • Collect additional tree core samples • Finalize hydrologic budget to determine groundwater extraction rate • Update groundwater flow model to better predict remediation

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