Biodegradation of Dissolved Organic Matter (DOM) Released from Phytoplankton in Lake Biwa
Biodegradation of Dissolved Organic Matter (DOM) Released from Phytoplankton in Lake Biwa
复制标题
DOI：
10.2116/analsci.28.675
复制
发表时间：
2012-07
影响因子：
1.6
通讯作者：
E. Yamada;S. Ohara;Takashi Uehara;Takaaki Hirota;Naoko Hatori;Y. Fuse;Shinichi Aoki
中科院分区：
文献类型：
--
作者：
E. Yamada;S. Ohara;Takashi Uehara;Takaaki Hirota;Naoko Hatori;Y. Fuse;Shinichi Aoki
对铜绿微囊藻、背齿星藻和卵形隐藻释放的溶解性有机物（DOM）进行了生物降解研究。铜绿微囊藻和背齿星藻释放的藻类DOM相对稳定，而卵形隐藻释放的部分藻类DOM可能容易被分解。在生物降解前，3种浮游植物释放的藻类DOM均出现2个富里酸类荧光峰（A和B）、1个蛋白类荧光峰（C）和1个E _x/ E _m值为320 ~ 330/390 nm的荧光峰（D）。无论浮游植物的种类如何，富里酸类荧光团可能是难降解的，而铜绿微囊藻和Staurastrum dorsidentiferum释放的蛋白质类荧光团可能相对难降解，而卵形隐藻释放的蛋白质类荧光团可能不稳定。琵琶湖表层水中的D峰可能是由于几种浮游植物在养殖和/或生物降解过程中产生的低分子量物质。藻类DOM中A峰与B峰的荧光强度比值（RFI/DOC）<1.0，而土壤Dando FA中A峰与B峰的荧光强度比值（RFI/DOC）为1.8。另一方面，峰A和峰C之间没有观察到的三种浮游植物的关系。
The biodegradation study of algal dissolved organic matter (DOM) released from Microcystis aeruginosa, Staurastrum dorsidentiferum and Cryptomonas ovata was carried out. The algal DOM released from Microcystis aeruginosa and Staurastrum dorsidentiferum is relatively stable, while a part of the algal DOM released from Cryptomonas ovata may be easily decomposed. Before biodegradation, two fulvic-like fluorescence peaks (A and B) and a protein-like fluorescence peak (C) and another peak with E _x/ E _m values of 320 – 330/390 nm (peak D) were observed in the algal DOM released from three kinds of phytoplankton. The fulvic-like fluorophores may be refractory regardless of the kinds of phytoplankton, while protein-like fluorophores released from Microcystis aeruginosa and Staurastrum dorsidentiferum may be relatively refractory and those from Cryptomonas ovata may be unstable. Peak D in the surface water of Lake Biwa may be attributed to low-molecular-weight substances produced during cultivation and/or biodegradation of several kinds of phytoplankton. The ratios of the fluorescence intensities (RFI/DOC) of peak A to peak B in algal DOM (<1.0) were lower than those in soil Dando FA (1.8). On the other hand, no relationships between peak A and peak C were observed for three kinds of phytoplankton.