Occurrence of unsaturated C25 highly branched isoprenoids (HBIs) in a freshwater wetland
作者： Ding He , Bernd R.T. Simoneit , Yunping Xu , Rudolf Jaffé
DOI: 10.1016/J.ORGGEOCHEM.2016.01.006
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摘要: Abstract Eight C25 highly branched isoprenoid (HBI) alkenes were detected in the freshwater wetland of Florida Everglades and tentatively assigned as a diene, three trienes, two tetraenes pentaenes based on their mass spectra, retention index literature reports. One diene one triene observed more frequently than others. The HBIs present varying amount up to 1000, 19,000, 780 150 ng/g dry weight periphyton, floc, surface soils deeper (ca. 1900 AD), respectively. Compound specific carbon isotope analysis most dominant (one triene) showed them be depleted 13C (δ13C −40.0‰ −38.5‰) suggesting recycled CO2 produced from decomposition organic matter an important C source biosynthesis these compounds. across this greater diversity abundance at locations with higher water N concentration longer hydroperiod (inundation). Historical variation occurrence soil cores multiple slough ridge environments was assessed. Their increased after ca. 1960 AD almost all suggests proliferation precursor biota (freshwater diatoms) over past five decades.
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