Two chemically distinct pools of organic nitrogen accumulate in the ocean

被引：144

作者：

Aluwihare, LI ^{[1
]}

Repeta, DJ

Pantoja, S

Johnson, CG

机构：

[1] Univ Calif San Diego, Scripps Inst Oceanog, Geosci Res Div, La Jolla, CA 92093 USA

[2] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA

[3] Univ Concepcion, Dept Oceanog, Concepcion, Chile

[4] Univ Concepcion, FONDAP, Ctr Invest Oceanog Pacifico SurOriental, Concepcion, Chile

来源：

SCIENCE | 2005年 / 308卷 / 5724期

关键词：

D O I：

10.1126/science.1108925

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The chemical dynamics of marine dissolved organic nitrogen (DON), a reservoir featuring surface accumulations even in areas where nitrogen limits productivity, have yet to be resolved. We exploited differences in the acid lability of amide bonds within high-molecular-weight (HMW) DON to show that vertical DON profiles result in part from the presence of two chemically distinct pools of amide. Half of HMWDON in surface waters is present as N-acetyl amino polysaccharides. In contrast, nearly all deep-sea HMWDON, and therefore, most HMWDON, is present in amides that resist both chemical hydrolysis and biological degradation.

引用

页码：1007 / 1010

页数：4

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