Implication of atmospheric nutrient inputs and warming effects for the ecosystem of Lake Yamanaka, Japan, revealed by sedimentary analysis
Implication of atmospheric nutrient inputs and warming effects for the ecosystem of Lake Yamanaka, Japan, revealed by sedimentary analysis
复制标题
沉积物分析揭示大气养分输入和变暖效应对日本山中湖生态系统的影响
DOI：
10.1007/s10750-022-05071-9
复制
发表时间：
2022
期刊：
影响因子：
2.6
通讯作者：
Tani Yukinori
中科院分区：
文献类型：
--
作者：
Yamamoto Shinya;Kuwae Michinobu;Tsugeki Narumi;Tani Yukinori
为了重建湖泊生产力和营养状态的历史趋势，在过去的60年里，在高山湖泊，我们研究了硅藻和枝藻浮游动物的遗体，化石色素，和有机地球化学代理从日本山中湖的沉积物芯。从20世纪60年代到70年代中期，化石色素和总硅藻阀，以及硅藻组合的通量没有显示出任何显着的变化，这表明，人为的营养输入是不足以改变湖泊营养状态，尽管增加了人类活动的湖泊周围沿着在日本的快速经济增长。20世纪90年代以后，化石色素通量和富营养化硅藻的比例增加，表明营养盐在湖水中富集。20世纪90年代后期以后，随着总氮（TN）通量的增加，沉积物中稳定氮同位素比值（δ15Nbulk）逐渐降低，表明大气营养盐沉积增强。此外，重建的叶绿素被认为是埋葬后降解显着正相关的夏季地表水温自2006年以来。这些研究结果表明，在最近几十年，不仅是人为的营养负荷，而且气候变暖可能显着影响了山中湖的富营养化。
To reconstruct the historical trend of lake productivity and trophic status in mountain lakes over the past 60 years, we examined the diatom and cladoceran zooplankton remains, fossil pigments, and organic geochemical proxies in a sediment core from Lake Yamanaka, Japan. The fluxes of fossil pigments and total diatom valves, as well as diatom assemblages, did not show any marked changes from the 1960s to the mid-1970s, suggesting that the anthropogenic nutrient input was insufficient for changing the lake trophic status, despite the increased anthropogenic activities around the lake along with the concurrent rapid economic growth in Japan. After the 1990s, the increased fluxes of fossil pigments and percentage of eutrophic diatom species were suggestive of nutrient enrichment in the lake water. After the late 1990s, the stable nitrogen isotope ratios of bulk sediment (δ15Nbulk) gradually decreased with concurrent increases in the total nitrogen (TN) flux, thereby suggesting enhanced atmospheric nutrient deposition. In addition, the reconstructed Chl-aflux considered for post-burial degradation was significantly positively correlated with the summer surface water temperature since 2006. These findings suggest that, in recent decades, not only the anthropogenic nutrient loadings, but also climate warming might have significantly affected the eutrophication in Lake Yamanaka.