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DIRECT CARBON MONOXIDE PHOTOPRODUCTION FROM PLANT MATTER
Citation:
Tarr, M., W. Miller, AND a. Zepp. DIRECT CARBON MONOXIDE PHOTOPRODUCTION FROM PLANT MATTER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/420.
Description:
Initial studies to quantify direct carbon monoxide photoproduction from several plant species are reported. n addition to measuring CO emissions from live plant leaves, emission rates from dead leaf matter were also determined. enescent leaf matter photoproduced CO at rates that ranged from 1.3 to 5.4 times higher per unit area than living leaves, and dead leaves photoproduced CO at about an order of magnitude more rapidly than living leaves. t may be necessary, therefore, to incorporate CO photoproduction from dead plant matter into predictions of global CO emissions from plants. ethods are presented for direct measurement of CO photoproduction from live, intact leaves, from excised leaves, and from fallen leaves. lthough these techniques were initially used for laboratory studies, they are directly applicable to field studies. esults of mechanistic studies indicate that oxygen affects CO photoproduction but that carbon dioxide exhibits no direct influence. ormation of CO was shown to be the result of direct photochemical transformation on or in the plant material. urthermore, for live plant leaves, CO photoproduction was observed to occur internal to the leaf.