Tracing the production and degradation of autochthonous fractions of dissolved organic matter by fluorescence analysis

被引：521

作者：

Stedmon, CA ^{[1
]}

Markager, S ^{[1
]}

机构：

[1] Natl Environm Res Inst, Dept Marine Ecol, DK-4000 Roskilde, Denmark

来源：

LIMNOLOGY AND OCEANOGRAPHY | 2005年 / 50卷 / 05期

关键词：

D O I：

10.4319/lo.2005.50.5.1415

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present the results of a mesocosm experiment investigating the production and utilization of autochthonous dissolved organic matter (DOM) by the plankton community under different inorganic nutrient regimes. Fluorescence spectroscopy combined with parallel factor analysis was applied to study the dynamics of autochthonous DOM. Seven independent fluorescent fractions were identified, differing in their spectral characteristics, production rates, and sensitivity to photochemical and microbial degradation processes. Five different humic fractions, a marine protein, and a peptide fluorescence were found. The five humic fractions were produced microbially, with the greatest production occurring under combined Si- and P-limiting conditions. The two proteinaceous fractions were produced during exponential growth of phytoplankton, irrespective of biomass composition. Photodegradation was an important sink for the microbially derived humic material, and the marine protein material was susceptible to both photo-and microbial degradation.

引用

页码：1415 / 1426

页数：12

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