大型水生浮游植物同位素研究
Other Title
Stable Isotopic Study of Macrophytes of Taiwan Estuary
Date Issued
2004
Date
2004
Author(s)
DOI
912116M002029
Abstract
Stable isotope analysis is of importance and can be widely applied in geochemical study,
especially in studying pollutions, food webs, and environmental changes (Macko & Ostrom,
1994 ；Michener & Schell, 1994 ；Meyer,1997). However, the information that derived from
sediments could not perfectly discribe the paleo-productivity and nutrient situation of water
body. The nutrient situation will be changed because of catchment vegetation, erosion of
riverine rock, dry deposition, human activities, and aquatic productivity. Once the nutrient
situation is changed, the population of primary production would be influenced. For example,
eutrophication happens when the supplement of nutrient is too high (Voss & Struck, 1997).
Based on our previous study of the southwestern coastal plain and Taipei Basin, we found that
there is some sections that the nitrogen isotopic values became heavy. Based on our analysis
the surface sediments of Chiku lagoon, we found different δ 15 N from 4 to 12‰ according to different position and salinity .The probable reason may be the influence of growth of high
δ 15 N macrophyte in the semi-salty water of estuarine environment. In order to understand how
the macrophyte affect the δ 15 N of sediments, in this study, we will analyze the nitrogen
isotope of sediments and macrophyte sampled from the estuary of Tanshui River and
southwestern coastal lagoons, accompanied with carbon and sulfur isotope and C/N ratio, to
understand the relationship between the growth of macrophyte and the isotope values of
sediments. Furthermore, we will try to establish the database of lagoonal macrophyte in order
to efficiently use stable isotopes as proxies to understand the environmental change and
reconstruct the paleo-environment.
Subjects
macrophyte
stable isotope
C/N ratio
environmental change
SDGs
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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