Comparison of nitrogen and phosphorus accumulation in plants associated with streams and peatbogs in mid-forest headwater ecosystems
Wrzesień 05, 2017
Grudzień 03, 2017
A., Jonczak J.
The paper presents results of a 3-year-long study (2012-2014) into the nitrogen and phosphorus bioaccumulation in 22 plant species associated with mid-forest headwater streams and in 10 plant species associated with peatbogs in the valley of the Kamienna Creek, a left bank tributary of the Słupia River, northern Poland. Plants were sampled in May, July and September of each year from three locations along the streams and three locations within the peatbogs. Every month stream water and ground water were sampled in the same locations using 30 cm piezometers. The content of nitrogen and phosphorus was determined in the plant and water samples. In the plant samples, total nitrogen was assessed with the Kjedahl method and phosphorus was determined with the molybdenum method. Concentrations of NH4+, NO2-, NO3- and PO43- in ground water samples were determined using ion chromatography. Stream and ground water contained low concentrations of mineral forms of these elements, which is associated with the strongly limited influence of anthropogenic factors and almost complete afforestation of the creek’s catchment. Despite this, the supply of plants with nitrogen and phosphorus was sufficient, which is confirmed by the concentrations of these elements in plants. However, peatbog plants accumulated the elements more intensively. The highest accumulation of nitrogen and phosphorus was found in the shoots of Urtica dioica. Among the stream plants, Brachythecium rivulare and Carex remota accumulated the least nitrogen. The average N:P ratio in plants, which was <10, suggests that nitrogen rather than phosphorus is a limiting factor for the plant growth in the analyzed ecosystem. Statistically significant Spearman correlation coefficients indicate that the concentrations of N and P in shoots of the tested plants were closely interdependent. Veronica beccabunga, Chrysosplenium alternifolium and Urtica dioica, accumulating the greatest amounts of N and P in their shoots, can be taken into account when constructing artificial wetlands intended to act as forest buffer zones.
Parzych A., Jonczak J. 2018. Comparison of nitrogen and phosphorus accumulation in plants associated with streams and peatbogs in mid-forest headwater ecosystems. J. Elem., 23(2): 459 - 469. DOI: 10.5601/jelem.2017.22.3.1527
Headwater ecosystems, herbaceous vegetation, bioaccumulation, nutrients, biological turnover