Catalog Home Page

Estimating production of gilvin from catchment leaf litter during seasonal rains

Qiu, S., McComb, A.J., Bell, R.W. and Davis, J.A. (2005) Estimating production of gilvin from catchment leaf litter during seasonal rains. Marine and Freshwater Research, 56 (6). pp. 843-849.

Link to Published Version: http://dx.doi.org/10.1071/MF04297
*Subscription may be required

Abstract

The yellow substance, gilvin, is an important component of water quality in natural waters. Quantitative study of gilvin production is difficult since gilvin is not a well defined substance. In the present study, leaf litter from four common tree species of south-western Australia were exposed to rainy weather for 183 days and leachate properties were monitored. The gilvin leaching from litter was estimated using a ‘humic acid (HA) equivalent’ concept, derived by drawing an analogy between the spectrophotometric properties of gilvin and that of humic acid. Gilvin (g440, m-1) was leached from litter primarily during the first few weeks after the commencement of the wet season. On average, 13% less gilvin was leached under ‘flooded’ conditions compared with ‘non-flooded’ conditions. Litter leaching in the presence of soil caused a significant time lag (about a month) for the peak load to occur, and reduced the total gilvin in the leachate through soil–litter interactions. Banksia menziesii leaves produced little gilvin, equivalent to 6.6% of that leached from the flooded gum. The Eucalyptus species, such as flooded gum and jarrah, common in wooded catchments in the region, appeared to be a major player producing yellow-coloured substances under annual rainfall conditions in south-western Australia.

Publication Type: Journal Article
Murdoch Affiliation: School of Environmental Science
Publisher: CSIRO Publishing
Copyright: 2005 CSIRO
URI: http://researchrepository.murdoch.edu.au/id/eprint/5469
Item Control Page