温带海藻群体的DOC释放有强烈的季节性模式:对沿海海洋碳循环的影响
Ellie R Paine1, Elizabeth A Brewer2, Matthias Schmid1,3,4
1Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia.
Journal of phycology
|May 30, 2023
概括
海藻在温暖的月份释放出更多的溶解有机碳 (DOC),为沿海微生物食物网提供燃料. 这种季节性释放是由光合作用驱动的,而不是碳吸收策略或海藻生物质.
科学领域:
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 海藻释放的溶解有机碳 (DOC) 对沿海微生物食物网和海洋的碳循环至关重要.
- 在南半球温带地区的季节性DOC释放模式尚不清楚.
- ,光和温度等环境因素影响海藻生长和DOC释放.
研究的目的:
- 调查塔斯马尼亚的主导海藻物种对DOC释放的季节性模式.
- 为了确定二氧化碳 (CO2) 缩机制 (CCM) 是否会影响DOC释放率.
- 评估海藻DOC对沿海碳循环的珊瑚礁规模贡献.
主要方法:
- 在塔斯马尼亚州的Coal Point进行了一年的季节性调查和海藻采样.
- 实验室实验量化季节性DOC释放率的主导海藻物种.
- 基于季节性数据的珊瑚礁规模净DOC释放的计算.
主要成果:
- 所有研究的海藻物种在春季和夏季的DOC释放量都显著增加 (比秋冬高327倍).
- 无机碳 (Ci) 吸收策略 (CCM) 并没有对DOC释放率进行调节.
- 季节性DOC释放与高总光合作用期间的光合作用溢出有关,以组织C:N比率表示.
结论:
- 海藻在澳大利亚温带水域的DOC释放非常季节性,在温暖的月份达到峰值.
- 光合作用活动,而不是生物质或CCM,主要驱动季节性DOC释放.
- 珊瑚礁中DOC排放的最大贡献者是Phyllospora comosa,这凸显了主导物种的重要性.
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