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ROLE OF LEAF SURFACE WATER IN BI-DIRECTIONAL AMMONIA EXCHANGE
Citation:
WU, Y., J. T. WALKER, JR., C. PETERS-LIDARD, D. SCHWEDE, R. DENNIS, AND W. ROBARGE. ROLE OF LEAF SURFACE WATER IN BI-DIRECTIONAL AMMONIA EXCHANGE. In Proceedings, Agricultural Air Quality, State of the Science, Baltimore, MD, June 05, 2006. National Oceanic and Atmospheric Administration, Ann Arbor, MI, CD, (2006).
Impact/Purpose:
to present information
Description:
A field experiment was conducted to study the ammonia exchange between plants and the atmosphere in a soybean field in North Carolina during the summer of 2002. In general, ammonia concentrations peak a few hours after sunrise. To investigate the mechanisms that control the exchange process, a new model is developed based on the multi-layer biochemical ammonia compensation point and leaf surface water effects. The model considers biochemical processes such as photosynthesis, respiration, and membrane passive transport through the cuticle. Model results suggest that while accurate prediction of the stomatal compensation point is critical, leaf surface water also plays an important role in the net canopy-scale ammonia flux.