source, composition, and environmental implication of neutral carbohydrates in sediment cores of subtropical reservoirs, south china
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2017
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Abstract
Neutral monosaccharides, algal organic matter (AOM), and carbon
stable isotope ratios in three sediment cores of various trophic reservoirs
in South China were determined by high-performance anion-exchange
chromatography, Rock-Eval pyrolysis, and Finnigan Delta Plus XL mass
spectrometry, respectively. The carbon isotopic compositions were corrected
for the Suess effect. The concentrations of total neutral carbohydrates
(TCHO) range from 0.51 to 6.4 mg g−1 at mesotrophic reservoirs,
and from 0.83 to 2.56 mg g−1 at an oligotrophic reservoir.
Monosaccharide compositions and diagnostic parameters indicate a predominant
contribution of phytoplankton in each of the three cores, which is consistent
with the results inferred from the corrected carbon isotopic data and
C∕N ratios. The sedimentary neutral carbohydrates are likely
to be structural polysaccharides and/or preserved in sediment minerals, which
are resistant to degradation in the sediments. Moreover, the monosaccharide
contents are highly related to the carbon isotopic data, algal productivity
estimated from the hydrogen index, and increasing mean air temperature during
the past 60 years. The nutrient input, however, is not a key factor affecting
the primary productivity in the three reservoirs. The above evidence
demonstrates that some of the resistant monosaccharides have been
significantly elevated by climate change, even in low-latitude regions.
| Reference Key |
duan2017biogeosciencessource,
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|---|---|
| Authors | ;D. Duan;D. Duan;D. Zhang;D. Zhang;Y. Yang;J. Wang;J. Chen;Y. Ran |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-4009-2017
|
| URL | |
| Keywords |
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