在模拟的未来海洋热浪事件下,在海草草中改变了营养循环功能
Alissa V Bass1, Ziyan Wang1, Nga Man Chung2
1The School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR.
The New phytologist
|July 16, 2025
概括
海洋热浪 (MHWs) 破坏了海草的营养循环. 模拟的MHW减少了海草的除,影响了水质和海洋酸化缓冲.
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
- 气候变化影响 气候变化影响
背景情况:
- 海草通过吸收来增强海洋营养循环和水质.
- 海洋热浪对这些重要生态系统构成重大威胁.
- 了解 MHW 对海草营养循环的影响对于预测生态系统服务变化至关重要.
研究的目的:
- 研究30天模拟的海洋热浪 (+5°C) 对热带海草Halophila ovalis.热带海草中循环和转化速率的影响.
- 评估海草生理反应和沉积物微生物功能在热应激下的变化.
- 评估对生态系统服务的影响,如改善水质和缓冲海洋酸化.
主要方法:
- 对30天海洋热浪的实验模拟,温度增加+5°C.
- 在Halophila ovalis中测量同化,呼吸,生存和生长率.
- 对沉积物脱率和海水总性进行量化.
主要成果:
- 海草叶在MHW条件下显示氨同化和呼吸率增加.
- 在热应激下,Halophila ovalis的生存和生长是高度可变的.
- 沉积物脱率显著下降,这表明去除能力下降.
- 海水的总度下降,这表明海洋酸化缓冲能力下降.
- 在这个时间尺度上,在植被和无植被沉积物之间没有观察到N循环速率的显著差异.
结论:
- 模拟的海洋热浪可以显著改变海草草原中的循环.
- 在MHW下减少化减少了海草提供的水质好处.
- 海洋酸化缓冲能力受到损害是海草息地MHWs的另一个后果.
- 未来的MHW可能会导致海草生态系统功能和服务的大幅减少.
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