A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Trend detection in water-quality and load time-series from agricultural catchments of Ylaneenjoki and Pyhajoki, SW Finland
Tekijät: Carlos A. Gonzales-Inca, Ahti Lepistö, Timo Huttula
Kustantaja: FINNISH ENVIRONMENT INST
Julkaisuvuosi: 2016
Journal: Boreal Environment Research
Tietokannassa oleva lehden nimi: BOREAL ENVIRONMENT RESEARCH
Lehden akronyymi: BOREAL ENVIRON RES
Vuosikerta: 21
Numero: 1-2
Aloitussivu: 166
Lopetussivu: 180
Sivujen määrä: 15
ISSN: 1239-6095
eISSN: 1797-2469
Verkko-osoite: http://www.borenv.net/BER/pdfs/ber21/ber21-166.pdf
Tiivistelmä
Long-term water quality (WQ) and load trends were studied in the catchments of Ylaneenjoki and Pyhajoki in SW Finland, where agricultural water protection measures have been implemented since the mid-1990s. A univariate Mann-Kendall (MK) trend test, a multivariate Mann-Kendall (MMK) trend test, and a multivariate Mann-Kendall trend test applied to the WQ data flow-normalized by a semi-parametric model (FN-MMK) were used. The results of all methods were similar when the nutrient concentration data were used, but they differed when using the nutrient load data. The FN-MMK test was intended to detect trends caused by anthropogenic impact. In the clay-soil-dominated catchment of Ylaneenjoki there were increasing trends in the concentrations and loads of total nitrogen, nitrate-nitrogen, dissolved reactive phosphorus, and a decreasing trend in suspended solid concentrations. However, no increasing or decreasing trends were detected for the majority of the concentrations or loads in sand-soil-dominated catchment of Pyhajoki. This suggests different responses to comparable environmental and anthropogenic pressures in these two river basins.
Long-term water quality (WQ) and load trends were studied in the catchments of Ylaneenjoki and Pyhajoki in SW Finland, where agricultural water protection measures have been implemented since the mid-1990s. A univariate Mann-Kendall (MK) trend test, a multivariate Mann-Kendall (MMK) trend test, and a multivariate Mann-Kendall trend test applied to the WQ data flow-normalized by a semi-parametric model (FN-MMK) were used. The results of all methods were similar when the nutrient concentration data were used, but they differed when using the nutrient load data. The FN-MMK test was intended to detect trends caused by anthropogenic impact. In the clay-soil-dominated catchment of Ylaneenjoki there were increasing trends in the concentrations and loads of total nitrogen, nitrate-nitrogen, dissolved reactive phosphorus, and a decreasing trend in suspended solid concentrations. However, no increasing or decreasing trends were detected for the majority of the concentrations or loads in sand-soil-dominated catchment of Pyhajoki. This suggests different responses to comparable environmental and anthropogenic pressures in these two river basins.
Turun yliopiston Tutkimustietojärjestelmän portaali