Does Fertilization Make Trees More Thirsty? Adan Hernandez Hernandez, UNH Virginia Hernandez-Santana, IRNAS, Seville, Spain Heidi Asbjornsen, UNH July.

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Presentation transcript:

Does Fertilization Make Trees More Thirsty? Adan Hernandez Hernandez, UNH Virginia Hernandez-Santana, IRNAS, Seville, Spain Heidi Asbjornsen, UNH July 11, Adan Hernandez Hernandez, UNH Virginia Hernandez-Santana, IRNAS, Seville, Spain Heidi Asbjornsen, UNH July 11, 2012.

INTRODUCION Many impacts of atmospheric deposition on forest dynamics have been studied: mortality, productivity, plant diversity, plant health, regeneration dynamics. Less is known about impacts on vegetation water use and water use efficiency  implications for hydrologic cycle and water supply. A study in 2011 (Hernandez- Santana unpubl) showed no significant effects of nutrient amendments on plant water use after 5 months.

Research question What are the effects of nutrient amendments on individual tree water use of the dominant species and on stand transpiration in young and mature forests in Bartlett Experimental Forest, New Hampshire?

Experimental design in Bartlett, NH Young stand (24-year-old) Mature stand (>100-year-old)

Sampling design StandsDBH (cm)Treatments Total # trees Tree species Mature N,P,NP,C28 Yellow birch (YB) American beech (BE) Sugar maple (SM) Young N,P,NP,C32 Pin cherry (PC) Red maple (RM) White birch (WB)

Data collection Sap flow station Heat ratio method (Burgess et al., 2001)

Preliminary results: hourly sap velocity (one individual per treatment) 3

June Preliminary results: Hourly sap velocity (one individual per treatment)

Preliminary results: Mean hourly sap velocity (Vs): 10:00 am to 2:00 pm, 7-day average

These preliminary results show a trend of greater sap velocity for Red maple in the Young stand compared to the American beech in the Mature stand. Sap flow calculation, more long-term data and statistical analyses are needed to assess significant differences in vegetation water use in response to nutrient amendment treatments. Conclusion

I would like to thank Heidi Asbjornsen, Virginia Hernandez-Santana and my lab group. Questions and suggestions