沉积物碳储存在本地和非本地加勒比海草床上有所不同
Catherine L Brenner1, Stephanie R Valdez1, Y Stacy Zhang2
1Division of Marine Science and Conservation, Nicholas School of the Environment, Duke University, 135 Duke Marine Lab Rd., Beaufort, NC 28516, USA.
Marine environmental research
|December 27, 2023
概括
侵袭性海草Halophila stipulacea比加勒比地区的本地海草储存的碳少. 这一发现表明,这种非本地物种的扩散可能会减少沿海碳库存,影响气候变化缓解努力.
科学领域:
- 海洋生态海洋生态学
- 生态系统服务生态系统服务
- 气候变化科学 气候变化科学
背景情况:
- 非原生物种的引入是一个日益严重的全球性问题,改变了生态系统的功能.
- 海草是沿海生态系统中至关重要的基础物种,在碳捕获中发挥着关键作用.
- 侵袭性海草Halophila stipulacea正在加勒比地区扩大,其对碳储存的影响基本上是未知的.
研究的目的:
- 量化和比较本地海草床和Halophila stipulacea入侵地区之间的沉积物和海草组织中的有机碳 (Corg) 储存量.
- 评估H. stipulacea入侵对加勒比海沿岸生态系统碳捕集能力的影响.
主要方法:
- 实地研究在圣约翰,USVI进行.
- 在沉积物和海草组织中量化有机碳 (Corg) 含量.
- 在单型H. stipulacea床,混合本土海草床 (Thalassia testudinum,Syringodium filiforme) 和无植物基板上对Corg含量的比较.
主要成果:
- 本地海草床的沉积物中含有比H. stipulacea床的1.3倍多的Corg,比没有植被区域的1.6倍多.
- 在H. stipulacea的床上储存的Corg是无植物基质的1.2倍.
- 与H. stipulacea.相比,本地海草物种的地面生物量 (2.2倍) 和地下生物量 (6.0倍) 显著增加.
结论:
- 哈洛菲拉 (Halophila stipulacea) 的入侵与加勒比海沿岸生态系统的碳储量减少有关.
- 侵占地区的低碳储存对气候变化缓解战略有潜在的负面影响.
- 保护工作应考虑入侵性海草对碳封存等重要生态系统服务的影响.
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