海底地下水排放超过了河流输入,作为大堡礁的营养来源
Douglas R Tait1,2, Isaac R Santos2,3, Sèbastien Lamontagne4
1National Marine Science Centre, Southern Cross University, Coffs Harbour 2450, Australia.
Environmental science & technology
|October 8, 2023
概括
海底地下水排放 (SGD) 是大堡礁 (GBR) 的重要营养来源,比河流贡献更多的和. 然而,内部回收仍然是GBR初级生产的主要驱动力.
科学领域:
- 海洋化学 海洋化学
- 海洋学 海洋学 海洋学
- 生态系统动态生态系统动态
背景情况:
- 大堡礁 (GBR) 面临缩风险,河流传统上被认为是主要的营养来源.
- 现有的营养预算表明,大量的和来源为初级生产提供燃料.
研究的目的:
- 使用同位素量化从海底地下水排放 (SGD) 到GBR的营养投入.
- 将SGD衍生的营养负载与河流输入进行比较,并评估它们对初级生产的贡献.
主要方法:
- 使用同位素作为标记物来估计货架规模的海底地下水排放 (SGD).
- 来自SGD的量化溶解无机 (DIN) 和 (DIP) 输入量.
- 将SGD营养贡献与已确定的河流输入进行比较.
主要成果:
- 总的SGD比GBR的平均河流输入量大1015倍.
- SGD贡献了超过30%的溶解无机和超过60%的无机投入.
- 尽管SGD投入很大,但它们只占初级生产力所需的营养素的一小部分,这表明内部回收占主导地位.
结论:
- 海底地下水排放是大堡礁的主要,以前被低估的营养来源.
- 对珊瑚礁营养物质污染的管理策略应该考虑SGD以及河流输入.
- 对内部营养回收过程的进一步研究对于理解和管理GBR营养预算至关重要.
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