当前位置: X-MOL 学术Limnol. Oceanogr. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Water chemistry variation in tropical high-mountain lakes on old volcanic bedrocks
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2022-05-23 , DOI: 10.1002/lno.12099
Pablo V. Mosquera 1, 2 , Henrietta Hampel 3 , Raúl F. Vázquez 4 , Jordi Catalan 5, 6
Affiliation  

Water chemistry and its ecological implications have been extensively investigated in temperate high-mountain lakes because of their role as sentinels of global change. However, few studies have considered the drivers of water chemistry in tropical mountain lakes underlain by volcanic bedrock. A survey of 165 páramo lakes in the Cajas Massif of the Southern Ecuador Andes identified 4 independent chemical variation gradients, primarily characterized by divalent cations (hardness), organic carbon, silica, and iron levels. Hardness and silica factors showed contrasting relationships with parent rock type and age, vegetation, aquatic ecosystems in the watershed, and lake and watershed size. Geochemical considerations suggest that divalent cations (and related alkalinity, conductivity, and pH) mainly respond to the cumulative partial dissolution of primary aluminosilicates distributed throughout the subsurface of watersheds, and silica and monovalent cations are associated with the congruent dissolution of large amounts of secondary aluminosilicates localized in former hydrothermal or tectonic spots. Dissolved organic carbon was much higher than in temperate high-mountain lakes, causing extra acidity in water. The smaller the lakes and their watersheds, the higher the likelihood of elevated organic carbon and metals and low hardness. The watershed wetland cover favored metal levels in the lakes but not organic carbon. Phosphorus, positively, and nitrate, negatively, weakly correlated with the metal gradient, indicating common influence by in-lake processes. Overall, the study revealed that relatively small tropical lake districts on volcanic basins can show chemical variation equivalent to that in large mountain ranges with a combination of plutonic, metamorphic, and carbonate rock areas.

中文翻译:

旧火山基岩上热带高山湖泊的水化学变化

由于温带高山湖泊作为全球变化的哨兵作用,水化学及其生态影响已被广泛研究。然而,很少有研究考虑火山基岩下的热带高山湖泊中水化学的驱动因素。一项对厄瓜多尔南部安第斯山脉 Cajas Massif 的 165 个帕拉莫湖的调查确定了 4 个独立的化学变化梯度,主要以二价阳离子(硬度)、有机碳、二氧化硅和铁含量为特征。硬度和二氧化硅因子与母岩类型和年龄、植被、流域内的水生生态系统以及湖泊和流域的大小呈对比关系。地球化学考虑表明二价阳离子(以及相关的碱度、电导率、和 pH 值)主要响应分布在流域地下的初级铝硅酸盐的累积部分溶解,二氧化硅和一价阳离子与位于前热液或构造点的大量次级铝硅酸盐的一致溶解有关。溶解的有机碳远高于温带高山湖泊,导致水体酸度增加。湖泊及其流域越小,有机碳和金属含量升高以及硬度低的可能性就越高。流域湿地覆盖有利于湖泊中的金属含量,而不是有机碳。磷与金属梯度呈正相关,硝酸盐与金属梯度呈负相关,表明受湖内过程的共同影响。全面的,
更新日期:2022-05-23
down
wechat
bug