Temporal variations of phytoplankton biomass over the past 150 years in the western Seto Inland Sea, Japan
Temporal variations of phytoplankton biomass over the past 150 years in the western Seto Inland Sea, Japan
复制标题
日本濑户内海西部过去150年浮游植物生物量的时间变化
DOI：
10.1007/s10872-016-0404-y
复制
发表时间：
2017
影响因子：
2.3
通讯作者：
Takeoka H.
中科院分区：
文献类型：
--
作者：
Tsugeki N. K.;Kuwae M.;Tani Y.;Guo X.;Omori K.;Takeoka H.
通过对日本濑户内海西部半封闭海湾别府湾210 Pb定年沉积物岩芯中的色素化石的研究，记录了过去150年中浮游植物生物量的时间变化。化石色素通量被用作浮游植物生物量的指标，我们重建后，去除埋藏后降解的化石色素浓度的影响。从1960年代到1970年代初，流量翻了一番，在1980年代初下降或保持稳定，从1980年代末到1990年代初再次增加。1960年代浮游植物生物量的第一次增加可能是由于来自流域的陆地营养物通量增加而引起的富营养化。1980年代初浮游植物生物量的减少可能与污水处理系统的建立有关，该系统减少了流入海洋的陆地营养物质。然而，陆地营养盐通量不能解释20世纪80年代末至90年代初的第二次增加。营养盐从陆坡流入海洋的加剧可能是浮游植物生物量第二次增加的原因。这是由浮游植物生物量和海平面之间的反比关系在陆架坡，后者是海洋营养物质从陆架坡流入大海的强度的指数支持。因此，海洋营养盐的供应可能是决定濑户内海西部初级生产力的一个关键因素。
We examined fossil pigments in a210Pb-dated sediment core to document the temporal variations in phytoplankton biomass over the past 150 years in a semi-enclosed bay, Beppu Bay, in the western Seto Inland Sea, Japan. The flux of fossil pigments was used as an index of phytoplankton biomass, which we reconstructed after removing the effect of post-burial degradation on the concentrations of fossil pigments. The flux doubled from the 1960s to the early 1970s, decreased or remained stable in the early 1980s, and increased again from the late 1980s to the early 1990s. The first increase in phytoplankton biomass during the 1960s was likely caused by eutrophication due to an increase in terrestrial nutrient fluxes from watersheds. The decreasing phytoplankton biomass in the early 1980s was likely related to the establishment of a sewage treatment system that reduced the terrestrial nutrient fluxes to the sea. However, the terrestrial nutrient fluxes could not explain the second increase from the late 1980s to the early 1990s. Intensification of the influx of nutrients from the shelf slope to the sea was likely the cause of the second increase in phytoplankton biomass. This is supported by the inverse relationship between phytoplankton biomass and sea level at the shelf slope, the latter being an index of the intensity of the influx of oceanic nutrients from the shelf slope to the sea. The supply of oceanic nutrients may be therefore a critical factor in the determination of primary production in the western Seto Inland Sea.