Erosion of cultivated kelp facilitates dissolved organic carbon release

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Marine environmental research Pub Date : 2024-09-02 DOI:10.1016/j.marenvres.2024.106728

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Abstract

Growing trend of interests for contributions of cultivation of kelp to carbon sequestration have been driven globally. Saccharina japonica is an important cultivated seaweed, with erosion phenomenon usually occurs at the distal part of the frond in S. japonica throughout the growth cycle. However, the dynamics of dissolved organic carbon (DOC) release induced by erosion of S. japonica are not well understood. This study revealed that erosion induced a substantial increase in DOC release, with a 14% increase under low light (LL) conditions and a 54% increase under high light (HL) conditions. A 10 cm of long slit cut into the distal part of S. japonica increased the rate of DOC release by 56% under LL conditions, and by 13% under HL conditions. Additionally, the epibiotic microorganisms facilitate the release of DOC, and the effects were even more pronounced in erosive S. japonica. Conversely, the proximal part of S. japonica exhibited a higher photosynthetic carbon fixation capacity, with a carbon-to-nitrogen (C/N) ratio approximately 1.76 times higher than that in distal part. During the growth of S. japonica, excess photosynthetic products were often transported from the proximal part into distal part, further facilitating DOC release. In summary, DOC released induced by erosion of S. japonica could make contributions to oceanic carbon sequestration.

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养殖海带的侵蚀有利于溶解有机碳的释放

在全球范围内，人们对种植海带为碳封存做出贡献的兴趣与日俱增。海带是一种重要的栽培海藻，在整个生长周期中，海带叶片的远端通常会出现侵蚀现象。然而，人们对海藻侵蚀引起的溶解性有机碳（DOC）释放的动态并不十分了解。本研究发现，侵蚀会导致溶解性有机碳（DOC）释放量大幅增加，在弱光（LL）条件下增加 14%，在强光（HL）条件下增加 54%。在粳稻上部切开一条 10 厘米长的缝，在低光照条件下 DOC 释放率增加了 56%，在高光照条件下增加了 13%。此外，附生微生物促进了 DOC 的释放，在侵蚀性粳稻中效果更为明显。相反，粳稻近端表现出较高的光合固碳能力，其碳氮（C/N）比约为远端的 1.76 倍。在粳稻的生长过程中，多余的光合产物通常会从近端部分转移到远端部分，从而进一步促进了 DOC 的释放。综上所述，白云母侵蚀释放的 DOC 可为海洋固碳做出贡献。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.