Effects of seagrass leaf litter decomposition on sediment organic carbon composition and the key transformation processes

文献类型： 外文期刊

第一作者： Liu, SongLin

作者： Liu, SongLin;Jiang, ZhiJian;Wu, YunChao;Zhao, ChunYu;Zhang, JingPing;Shen, Yuan;Huang, XiaoPing;Liu, SongLin;Wu, YunChao;Zhao, ChunYu;Shen, Yuan;Huang, XiaoPing;Deng, YiQin

作者机构：

关键词： Seagrass leaf litter;Sediment organic carbon;Composition;Enzyme activities

期刊名称：SCIENCE CHINA-EARTH SCIENCES （ 影响因子：4.368； 五年影响因子：3.814 ）

ISSN： 1674-7313

年卷期： 2017 年 60 卷 12 期

页码：

收录情况： SCI

摘要： Seagrass leaf litters are an important source of sediment organic carbon (SOC). However, the mechanisms of seagrass leaf litter decomposition influencing SOC composition and the key transformation processes remain unknown. We performed a laboratory chamber experiment to compare the labile organic carbon (OC) composition and the enzyme activities governing SOC transformation between the seagrass group (seagrass leaf litter addition) and the control group. The results showed that the seagrass leaf litter decomposition significantly elevated the salt-extractable carbon (SEC) content and the SEC/SOC. Additionally, the levels of invertase, polyphenol oxidase, and cellulase in the seagrass leaf litters addition group were generally higher than in the control group, which could elevate recalcitrant OC decomposition. Following 24 days incubation, addition of seagrass leaf litter increased the amount of CO2 released, but decreased the SOC content. Therefore, seagrass leaf litter decomposition leached abundant dissolved OC, which enhanced the activity and transformation of SOC.

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