Abstract
A survey of methyl chloride (CH 3Cl)-emitting plants was performed at a subtropical island in Japan (Iriomote Island). Among the 187 species of tropical/subtropical plants investigated, 33 species from a variety of families were identified as CH 3Cl-emitting plants. The strongest emitters were Osmunda banksiifolia, Cibotium balometz, Angiopteris palmiformis, Vitex rotundifolia, Vitex trifolia, and Excoecaria agalloch, each with CH 3Cl emission rates exceeding 1 μg (g dry wt) −1 h −1. The first three species are ferns, and the last three are halophilous plants. Based on our results, the character of CH 3Cl emission is likely to be shared at the genus level but not always at the family level. The atmospheric CH 3Cl distribution measured on Iriomote Island showed significant enhancement in forested sites (up to 2750 ppt) and a higher concentration on the downwind shore than on the upwind shore. As previously reported, our findings provide strong evidence for the high emission of CH 3Cl from tropical/subtropical forests.
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