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- Title
The coral δN record of terrestrial nitrate loading varies with river catchment land use.
- Authors
Yamazaki, A.; Watanabe, T.; Tsunogai, U.; Hasegawa, H.; Yamano, H.
- Abstract
We analysed the nitrogen isotopes in two coral cores (δN) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δN reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δN for 14 years (CORE1; 1993-2007) and the annual variation of δN for 52 years (CORE2; 1958-2010). In CORE1, the 5-month running mean of δN was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d). In CORE2, the δN mean in the earlier period (1958-1980) was 1.0 ‰ greater than that in the later period (1981-2010). The annual averages of δN are positively correlated with the total precipitation in the rainy season (May-June) for both time periods. The difference in the δN between the earlier and later periods is probably caused by the land use changed from paddy fields with N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δN coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals.
- Subjects
ISHIGAKI Island (Japan); JAPAN; NITROGEN isotopes; CORAL reef ecology; LAND use &; the environment; METEOROLOGICAL precipitation; WATERSHEDS; NITROGEN fertilizers &; the environment; ISLANDS
- Publication
Coral Reefs, 2015, Vol 34, Issue 1, p353
- ISSN
0722-4028
- Publication type
Report
- DOI
10.1007/s00338-014-1235-1