| Abstract: | Estimates of external and internal sources of ions in net throughfall deposition were derived for a deciduous and coniferous canopy by use of multiple regression. The externel source component appears to be dominated by dry deposition of Ca2+, SO2 and NO3- during dormant and growing seasons for the two canopy types. Increases in the leaching rates of K+ and Mg2+ during the growing season reflect the presence of leaves in the deciduous canopy and increased physiological activity in both canopies. Internal leaching rates for SO42- doubled during the growing season presumably caused by increased physiological activity and uptake of SO2 through stomates. Net deposition of SO42- in throughfall during the growing season appears highly dependent on stomatal uptake of SO2. Estimates of SO2 deposition velocities were 0.06 cm s-1 and 0.13 cm s-1 for the deciduous and coniferous canopies, respectively, during the dormant season, and 0.30 cm s-1 and 0.43 cm s-1 for the deciduous and coniferous canopies, respectively, during the growing season. For the ions of major interest with respect to ecosystem effects, namely H+, NO3- and SO42-, precipitation inputs generally outweighed estimates of dry deposition input. However, net throughfall deposition of NO3- and SO42- accounted for 20-47 and 34-50 per cent, respectively, of total deposition of those ions. Error estimates of ion sources were at least 50-100 per cent and the method is subject to several assumptions and limitations. |
| Genre: | Article |
| ProdID: | 70016248 |
| Citation Author: | Puckett, L. J. |
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| Citation End Page: | 555 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Atmospheric Environment - Part A General Topics |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Estimates of ion sources in deciduous and coniferous throughfall; 1990; Article; Journal; Atmospheric Environment - Part A General Topics; Puckett, L. J. |
| Citation Start Page: | 545 |
| Citation Volume: | 24 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Estimates of ion sources in deciduous and coniferous throughfall; 1990; Article; Journal; Atmospheric Environment - Part A General Topics; Puckett, L. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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