The effect of tree species on seasonal fluctuations in water-soluble and hot water-extractable organic matter at post-mining sites

0459381 - BC 2017 RIV NL eng J - Journal Article
Cepáková, Šárka - Tošner, Z. - Frouz, Jan
The effect of tree species on seasonal fluctuations in water-soluble and hot water-extractable organic matter at post-mining sites.
Geoderma. Roč. 275, August (2016), s. 19-27. ISSN 0016-7061. E-ISSN 1872-6259
Grant - others:GA ČR(CZ) GAP504/12/1288; GAJU(CZ) GAJU/04-146/2013/P
Program: GA
Institutional support: RVO:60077344
Keywords : HWC * liquid-state 1H NMR * seasonality * soil organic carbon * water-extractable organic matter
Subject RIV: DF - Soil Science
Impact factor: 4.036, year: 2016

Seasonal changes in the contents of water-soluble carbon (WSC) and hot water-extractable carbon (HWC) were investigated in the organic and underlying mineral horizons of soils in a common garden experiment at 40 years old post-mining sites. The sites were planted with alder, oak, or spruce or overgrown by a spontaneous succession dominated by willow. Sampling was performed at 2-month intervals from April 2013 until March 2014. Two major peaks in WSC in the mineral horizons were evident: one in early summer and another in late autumn or winter. The peaks were more pronounced at sites with deciduous trees than with spruce. According to liquid-state 1H NMR spectroscopy, hot-water extracts (HWE) from the mineral horizons had a higher relative content of aliphatic components in summer, while the winter samples had a larger relative abundance of carbohydrates. The results suggest that the peaks had different sources of carbon. RDA with variation partitioning showed that both tree species and season significantly affected the composition of HWE, but that tree species was most important, explaining 67.3% of data variability. However, the trends in temporal variation in concentrations and chemical composition were remarkably similar at the studied sites suggesting the changes were mainly induced by seasons.
Permanent Link: http://hdl.handle.net/11104/0259595