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Clarissa Lyons (Smith College 2013) Kate Bussell (Transylvania University 2012)

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Presentation on theme: "Clarissa Lyons (Smith College 2013) Kate Bussell (Transylvania University 2012)"— Presentation transcript:

1 Clarissa Lyons (Smith College 2013) Kate Bussell (Transylvania University 2012)

2 Slide courtesy of Matt Green

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4  Two different methods are being employed in the MELNHE plots: the Granier method and the heat ratio method (HRM)  Heat-based sapflow techniques are the most widely used methods for sapflow measurement

5  An improvement of the compensation heat pulse method by Burgess et al. (2001)  Method being used by researchers at UNH, led by Heidi Asbjornsen  Measures the ratio of the increase in temperature at points equidistant from the line heater following the release of a heat pulse

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7 Below: Thermocouple placement within sensor Sapflow tree in Bartlett Experimental Forest (C8)

8  Developed by André Granier in 1985  Method used by Dr. Michele Pruyn and team from PSU  Constant heat source  Sapflow calculated from difference in temperature between two thermocouples

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12  Dr. Michele Pruyn, Assistant Professor of Plant Biology, Plymouth State University  Adan Hernandez, Graduate Student, University of New Hampshire  Dr. Heidi Asbjornsen, Associate Professor of Ecosystem Ecology, University of New Hampshire  Dr. Ruth Yanai, Professor of Forest and Natural Resources Management, SUNY ESF  Craig See, Master’s Student, SUNY ESF  Mark Green, Assistant Professor of Hydrology, Plymouth State University

13  Burgess, S.O. et al. (2001). An improved heat pulse method to measure low and reverse rates of sap flow in woody plants. Tree Physiology, 21,  Granier, A. et al. (1996). Transpiration of trees and forest stands: short and long-term monitoring using sapflow methods. Global Change Biology, 2,  Granier, A. et al. (1987). Evaluation of transpiration in a Douglas-fir stand by means of sap flow measurements. Tree Physiology, 3,  Kostner, B. et al. (1998). Sapflow measurements in forest stands: methods & uncertainties. Annals of Forest Science, 55,


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