Climate change accelerates recovery of the Tatra Mountain lakes from acidification and increases their nutrient and chlorophyll a concentrations

0510074 - BC 2020 RIV CH eng J - Článek v odborném periodiku
Kopáček, Jiří - Kaňa, Jiří - Bičárová, S. - Brahney, J. - Navrátil, Tomáš - Norton, S. A. - Porcal, Petr - Stuchlík, Evžen
Climate change accelerates recovery of the Tatra Mountain lakes from acidification and increases their nutrient and chlorophyll a concentrations.
Aquatic Sciences. Roč. 81, č. 4 (2019), č. článku 70. ISSN 1015-1621. E-ISSN 1420-9055
Grant CEP: GA ČR GA17-15229S
Institucionální podpora: RVO:60077344 ; RVO:67985831
Klíčová slova: weathering * accessory calcite and apatite * phosphorus * organic nitrogen
Obor OECD: Environmental sciences (social aspects to be 5.7); Environmental sciences (social aspects to be 5.7) (GLU-S)
Impakt faktor: 2.402, rok: 2019
Způsob publikování: Omezený přístup
https://link.springer.com/article/10.1007%2Fs00027-019-0667-7

We evaluated changes in the concentration of cations, anions, nutrients (dissolved organic carbon, DOC, phosphorus, P, and nitrogen forms including nitrate, NO3- and total organic nitrogen, TON), and chlorophyll a (Chl-a) in 31 Tatra Mountain lakes in Slovakia and Poland during their recovery from acidic deposition (1992-2018). Typical effects of decreasing acidic deposition on the lakes' water composition, such as decreasing base cation concentrations, were confounded by climate change and catchment characteristics, including areal proportions of well-developed soils and scree. A climate-related increase in physical erosion provided freshly exposed unweathered granodiorite (the dominant bedrock) to chemical weathering. Dissolution of accessory calcite in the granodiorite increased the in-lake Ca2+ and HCO3- concentrations and reversed the Ca2+ trends, which originally decreased in parallel with strong acid anions. These changes were most pronounced in steep, scree-rich areas, which are most sensitive to physical weathering. Fresh apatite [Ca-5(PO4)(3)(F, Cl, OH)] in the crushed granodiorite acts as a P source at soil pH's between 4 and 5 and in the presence of chelating organic acids within soils. These conditions enhance apatite solubility, which in part explains increasing P in lakes with scree-dominated catchments. Soil recovery from acidification due to decreasing acidic deposition and the neutralizing effect of weathering of erosion-derived accessory calcite were the most likely causes of elevated DOC and P export from soils. Their elevated leaching was accompanied by increasing in-lake concentrations of Chl-a and TON. The increasing TON concentrations were, as for Ca2+, most pronounced in the scree-rich catchments, and represented the most sensitive indicator of the changes in the lake water nutrient composition.
Trvalý link: http://hdl.handle.net/11104/0300630