Heleen de Wit, PhD in Soil Science from the Agricultural University of Norway (2000), is research scientist at NIVA with over 10 years of experience in terrestrial and catchment biogeochemistry. Research focus includes acid deposition effects on forests and freshwaters, and climate effects on carbon and nitrogen cycling. Recent activities include analysis of long-term environmental data in catchments in relation to climate and deposition. Her main responsibility in the ICP Waters programme is trend analysis of water chemistry and contributing to writing and editing of various reports.
Field of expertise
Soil chemistry, biogeochemistry of terrestrial ecosystems, freshwater quality, acidification, climate change
Professional Qualifications
2004 Research scientist at Norwegian Institute for Water Research in Oslo
2001 Research scientist at Norwegian Institute of Land Inventory, Ås
2000 Research scientist at Norwegian Institute of Forest Research, Ås
2000 PhD in agricultural sciences at University of Life Sciences in Ås
1994 Master degree in soil science at Agricultural University in Wageningen, the Netherlands
Recent publications
Monteith, D.T., J.L. Stoddard, C.D. Evans, H.A. de Wit, M. Forsius, T. Hogasen, A. Wilander, B.L. Skjelkvale, D.S. Jeffries, J. Vuorenmaa, B. Keller, J. Kopacek, and J. Vesely. 2007. Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry. Nature 450:537-541
De Wit, H.A., Hindar, A. and Hole, L. In press. Winter climate affects long-term trends in stream water nitrate in acid-sensitive catchments in southern Norway. Hydrology and Earth System Sciences.
De Wit, H.A., Mulder, J., Hindar, A. and Hole, L. 2007. Long term increase in dissolved organic carbon in stream waters in Norway is response to reduced acid deposition. Environmental Science and Technology. 2007, 7706-7713.
De Wit, H.A., Palosuo, T., Hylen, G. and Liski, J. 2006. A carbon budget of forest in southeast Norway. Forest Ecology and Management, 225: 15
Eldhuset, T., Lange, H., and De Wit H.A. 2006. Fine root biomass, necromass and chemistry during seven years of elevated aluminium concentrations in the soil solution of a middle-aged Picea abies stand. Science of the Total Environment, 369, 344-356
Nygaard, P. and H.A. de Wit. 2004. Effects of elevated soil solution Al concentrations on fine roots in a middle aged Norway spruce (Picea abies L. Karst) stand. Plant and Soil, 265: 131-140
Recent reports
De Wit, H., and Skjelkvåle, B.L. (eds.) 2007. Trends in surface water chemistry and biota; The importance of confounding factors. NIVA-report SNO 5385-2007. ICP Waters report 87/2007.
Skjelkvåle, B.L., Forsius, M., Wright, R.F., de Wit, H., Raddum, G.G., and Sjøeng, A.S.M. 2006. Joint Workshop on Confounding Factors in Recovery from Acid Deposition in Surface Waters, 9-10 October 2006, Bergen, Norway; Summary and Abstracts. NIVA-report SNO 5310-2006. ICP Waters report 88/2006.
Schartau, A.K., Fjellheim, A., Walseng, B., Monsen, B., Halvorsen, G., Raddum, G.G., de Wit, H., et al. 2006. Monitoring long-range transboundary air pollution. Effects 2005. NIVA report 5287. In Norwegian, with English summary.
Hindar, A., H. de Wit and L. Hole. 2005. The significance of climate variability for nitrogen in rivers and streams. NIVA-report 5065/2005. ISBN No.: ISBN 82-577-4768-8. In Norwegian, with English summary
Other
2007 Co-chair of the Gordon Research Conference on Catchment Science: Interactions of Interactions of Hydrology, Biology and Geochemistry (New Hamsphire, USA)
2006 Convenor of Session ‘Linkages of Biogeochemical Cycles’ in Biogeomon 2006 (Santa Cruz, California)
2006 PhD exam committee 2006 Dept. of Forest Ecology, Univ. of Helsinki, Finland
2005 Discussion leader at Gordon Research conference of Catchment Science: Interactions of Interactions of Hydrology, Biology and Geochemistry, in USA