Innovative spectral characterisation of beached pelagic sargassum towards remote estimation of biochemical and phenotypic properties.
Innovative spectral characterisation of beached pelagic sargassum towards remote estimation of biochemical and phenotypic properties.
复制标题
搁浅的中上层马尾藻的创新光谱表征，用于远程估计生化和表型特性。
DOI：
10.1016/j.scitotenv.2023.169789
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Fidai YA
中科院分区：
文献类型：
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作者：
Fidai YA
近年来，远洋马尾藻（S。flutans和S.在热带大西洋区域，大型藻类（即natans-此后称为马尾藻）的大量繁殖变得更加频繁，规模更大，生物量更高。它们对环境和社会经济产生影响，特别是对沿海生态系统、旅游业、渔业和水产养殖业以及公共卫生产生影响。尽管存在这些挑战，但马尾藻生物质有可能在蓝色经济中提供商业机会，尽管它依赖于马尾藻的关键化学和物理特性用于特定用途。在这项研究中，我们的目标是利用遥感光谱配置文件，以确定在不同的分解阶段和生化组成的物种/形态，以支持监测和增值的马尾藻。为此，我们在巴巴多斯和加纳开展了专门的实地活动，首次使用Spectra Vista Corp（SVC）HR-1024 i现场光谱仪收集了中上层马尾藻搁浅生物质的350至2500 nm之间的原位光谱测量值。光谱测量由使用DJI Phantom 4无人机和DJI P4多光谱仪器的无人航空系统调查补充。使用地面和空中数据集，本研究开发了一个业务框架，用于远程检测搁浅的马尾藻，并创建光谱配置文件的物种/形态和分解图，以推断生化组成。我们能够确定一些关键的光谱区域，包括在所有的马尾藻形态光谱剖面中发现的一致的吸收特征（920-1080 nm）;我们还观察到新鲜和最近搁浅的马尾藻之间的区别，特别是在900-1000 nm附近。这项工作可以支持远洋马尾藻管理，并有助于有效利用马尾藻生物质，最终减轻与这一新出现的环境挑战相关的一些社会经济影响。
In recent years, pelagic sargassum (S. fluitansandS. natans– henceforth sargassum) macroalgal blooms have become more frequent and larger with higher biomass in the Tropical Atlantic region. They have environmental and socio-economic impacts, particularly on coastal ecosystems, tourism, fisheries and aquaculture industries, and on public health. Despite these challenges, sargassum biomass has the potential to offer commercial opportunities in the blue economy, although, it is reliant on key chemical and physical characteristics of the sargassum for specific use. In this study, we aim to utilise remotely sensed spectral profiles to determine species/morphotypes at different decomposition stages and their biochemical composition to support monitoring and valorisation of sargassum. For this, we undertook dedicated field campaigns in Barbados and Ghana to collect, for the first time, in situ spectral measurements between 350 and 2500 nm using a Spectra Vista Corp (SVC) HR-1024i field spectrometer of pelagic sargassum stranded biomass. The spectral measurements were complemented by uncrewed aerial system surveys using a DJI Phantom 4 drone and a DJI P4 multispectral instrument. Using the ground and airborne datasets this research developed an operational framework for remote detection of beached sargassum; and created spectral profiles of species/morphotypes and decomposition maps to infer biochemical composition. We were able to identify some key spectral regions, including a consistent absorption feature (920–1080 nm) found in all of the sargassum morphotype spectral profiles; we also observed distinction between fresh and recently beached sargassum particularly around 900–1000 nm. This work can support pelagic sargassum management and contribute to effective utilisation of the sargassum biomass to ultimately alleviate some of the socio-economic impacts associated with this emerging environmental challenge.