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ID 20747
file
creator
Shikenya, Shozo
subject
Dissolved organic matter (DOM)
Leaching
Leaf litter
Riparian vegetation
Salix gracilistyla
NDC
Forestry
abstract
Abstract To estimate the importance of leaching of dissolved organic matter (DOM) as a pathway through which organic matter is supplied to stream ecosystems, we examined the amount of leachate over time and chemical properties of DOM leached from leaves in different conditions (i.e., green leaves, yellow senescent leaves, and leaf litter) of Salix gracilistyla Miq. the dominant riparian plant species in the middle reaches of rivers in western Japan. We analyzed dissolved organic carbon (DOC), total sugar and polyphenol in the leachate of leaf samples collected from a fluvial bar in the middle reaches of the Ohtagawa River in Hiroshima Prefecture, Japan. A considerable leaching of DOC from senescent leaves (37.3 mg g-1 d. w. leaf) and leaf litter (8.1 mg g-1 d. w. leaf) occurred within 24 h after the immersion. In contrast, DOC leached from green leaves was negligible until 1 wk after leaf immersion. Carbon loss of leaves by leaching within 24 h after leaf immersion was estimated to be less than 8%, suggesting that leaching of DOC from S. gracilistyla leaves is a minor pathway through which organic matter is supplied to stream ecosystems. DOM leached from the leaves included sugar and polyphenol, which were among the major chemical forms of DOM leached from the leaves (based on the molecular mass). In a laboratory experiment in which the difference in the stability of DOM between the chemical forms was examined, sugar decomposed more rapidly than polyphenol.
journal title
Journal of Forest Research
volume
Volume 12
issue
Issue 1
start page
68
end page
74
date of issued
2007-02
publisher
Springer Japan
issn
1341-6979
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 Springer "The original publication is available at www.springerlin.com"
relation url
department
Graduate School of Biosphere Science



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