Relationship between streamflow and nutrient and sediment losses from an oak-beech forest watershed during an 18-year long monitoring study in Turkey     

Ferhat Gökbulak  Yusuf Serengil  Süleyman Özhan  Necdet Özyuvacı  A. Nihat Balcı 《European Journal of Forest Research》2008,127(3):203-212

The objectives of this study were to quantify the amount of the stream discharge, nutrient fluxes, suspended sediment loss, and to define the relationship between streamflow and these parameters in a forest-covered watershed. The study was carried out in an experimental watershed, which has been monitored since 1979 in the Belgrad forest in Istanbul. Significant linear regressions were obtained between streamflow and discharge of selected water quality parameters. Mean monthly losses were 10.01 kg/ha for HCO₃ ⁻, 5.92 kg/ha for CI⁻, 0.07 kg/ha for total N, 1.29 kg/ha for Mg²⁺, 3.59 kg/ha for Ca²⁺, 2.59 kg/ha for Na⁺, 1.82 kg/ha for K⁺, 0.0113 kg/ha for P-PO₄ ³⁻, and 35.82 kg/ha for suspended sediments. Among the monitored water quality parameters, HCO₃ ⁻, CI⁻, and Ca²⁺ had greater losses than the rest of the chemical parameters studied in the watershed. Net gains (influx exceeded outflux) calculated for total N, Mg²⁺, K⁺, and P-PO₄ ³⁻ in the annual basis can be considered as an addition to the ecosystem’s organic nutrient pool. In contrast, net losses occurred for HCO₃ ⁻, CI⁻, Ca²⁺, and Na⁺.  相似文献   

Response of selected water chemical quality parameters to slight thinning in a mature oak–beech forest ecosystem under sub-humid climate conditions     

Yurtseven  Ibrahim  G&#;kbulak  Ferhat  Serengil  Yusuf  Erdo&#;an  Bet&#;l Uygur  &#;z&#;elik  Mehmet Said  &#;eng&#;n&#;l  Kamil  &#;zhan  S&#;leyman 《European Journal of Forest Research》2017,136(4):653-664

The objective of this study was to determine the effect of 18% thinning on streamflow nutrient flux from a mature oak–beech forest ecosystem by paired watershed approach. Two experimental watersheds including control (W-I) and treatment (W-IV) watersheds were used in the study. The experimental watersheds were monitored about 6 years from 2006 to 2011 for the calibration period and 4 years from 2012 to 2015 for the treatment period. The forest in the treatment watershed was thinned between October and December in 2011, and the forest in the control watershed was left untreated. Water grab samples were collected from the streams in the watersheds on weekly basis during both the calibration and treatment periods and analyzed for calcium (Ca²⁺), magnesium (Mg²⁺), Kjeldahl nitrogen (KN), sodium (Na⁺), potassium (K⁺), iron (Fe³⁺), aluminum (Al³⁺), ammonium nitrogen (NH₄ ⁺-N), and sulfate (SO₄ ²⁻). The simple linear regression equations were developed between mean monthly nutrient fluxes of two watersheds in the calibration period with significantly high correlation coefficients, and they were used to estimate nutrient fluxes from the treatment watershed during the treatment period as if thinning had not been applied. The changes in the monthly nutrient fluxes were estimated as the differences between measured and values calculated with the linear regression equations. Results showed that removal of 18% standing timber volume did not significantly change nutrient exports except for KN and Na⁺ from the treatment watershed.

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