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Effects of peat drainage on labile organic carbon and water repellency in NE Poland

Hot and cold water-extractable organic carbon (HWC and CWC, respectively) fractions, as good indicators of organic matter quality, as well as water repellency (WDPT test) and state of secondary humification were analyzed in topsoil samples of peatland drained for agricultural purposes 160 years ago. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2015) 39: 20-27 © TÜBİTAK doi:10.3906/tar-1402-66 http://journals.tubitak.gov.tr/agriculture/ Research Article Effects of peat drainage on labile organic carbon and water repellency in NE Poland 1, 1 2 Barbara KALISZ *, Andrzej LACHACZ , Roman GLAZEWSKI Department of Soil Science and Soil Protection, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland 2 Department of Environment Protection Engineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland 1 Received: 17.02.2014 Accepted: 03.07.2014 Published Online: 02.01.2015 Printed: 30.01.2015 Abstract: Hot and cold water-extractable organic carbon (HWC and CWC, respectively) fractions, as good indicators of organic matter quality, as well as water repellency (WDPT test) and state of secondary humification were analyzed in topsoil samples of peatland drained for agricultural purposes 160 years ago. The examined sites (drained and used as grassland) at the peatland had been affected by the moorsh-forming process. During this process, intense mineralization and secondary humification of organic matter took place. The state of transformation of organic soils varied from weak to complete degradation. The HWC contents ranged between 2.623 and 3.572 g kg–1 in field-moist samples and 3.999 and 6.074 g kg–1 in air-dried soil samples. The CWC contents were generally lower than HWC and ranged between 0.411 and 0.535 g kg–1 in field-moist samples and 0.696 and 0.939 g kg–1 in air-dried soil samples. The examined soils were extremely water repellent when dried. The measures of transformation of peat after drainage and WDPT were not significantly correlated, but a tendency for higher values of water repellency at the site regarded as degraded was noted. Deep drainage caused an increase of HWC fraction, which in light of the moorsh-forming process should be regarded as negative. The topsoil of the peatland became dry and resistant to .