Research Article Open Access

Hard Coal Fly Ash and Silica-Effect of Fine Particulate Matter Deposits on Brassica chinensis

Christian Ulrichs1, Uwe Schmidt2, Tanja Mucha-Pelzer1, Arunava Goswami2 and Inga Mewis3
  • 1 Section Urban Plant Ecophysiology, Institute for Horticultural Sciences, Humboldt University Berlin, Lentzeallee 55/57, 14195 Berlin, Germany
  • 2 Section Biosystem Techniques, Institute for Horticultural Sciences, Humboldt University Berlin, Lentzeallee 55/57, 14195 Berlin, Germany
  • 3 Biological Sciences Division, Indian Statistical Institute, 203 B. T. Road, Calcutta, West Bengal, India

Abstract

Problem statement: One focus in recent atmospheric pollution research is on fine Particle Matter (PM), especially as result of increasing traffic and anthropogenic activity in urban areas. Here, the impact on animal and human health has been in the center of many studies. Despite the fact that PM depositions can affect plants on the long term, there are only few studies about the impact on plants conducted. Approach: Therefore we studied the impact of PM on plants, using naturally occurring silica dusts (diatomaceous earth) and hard Coal Fly Ash (CFA) from burning processes. Dusts were applied onto Brassica chinensis L. using a simple duster (covering upper leaf surfaces) or electrostatically (covering leaf upper and -underside). Results: Main components of the tested CFA are SO42-, K, Ca and NH4+. The pH value of eluates was found to be around 9.5 in CFA and 5.7 in silica. B. chinensis was insensitive towards the high pH and showed no growth reduction when grown in silica or CFA substrate. PM deposition on leaf surfaces results through shading in a reduced photosynthetic activity. The reduction is relatively higher at higher light intensities. Photosynthesis stays reduced after removal of silica PM from leaf surfaces. We assume that stomata get cloaked by small particles and that silica absorbs lipids from the epicuticle resulting in a general stress reaction. Smaller sized silica particles resulted in a higher reduction of CO2-absorption. Next to particle size is the photosynthesis negatively correlated with exposure time for silica PM. The chlorophyll fluorescence data indicate that dust-covered leaves exhibited significantly lower quantum yield of PS II and a reduced quantum efficiency of PS II and therefore supported the gas exchange data. Conclusion: Reduced photosynthetic performance would be expected to reduce growth and productivity of B. chinensis. In contrast to silica hard coal fly ash showed only a reduction of photosynthesis through shading but did not have any long time effects after washing them off.

American Journal of Agricultural and Biological Sciences
Volume 4 No. 1, 2009, 24-31

DOI: https://doi.org/10.3844/ajabssp.2009.24.31

Submitted On: 7 January 2009 Published On: 31 March 2009

How to Cite: Ulrichs, C., Schmidt, U., Mucha-Pelzer, T., Goswami, A. & Mewis, I. (2009). Hard Coal Fly Ash and Silica-Effect of Fine Particulate Matter Deposits on Brassica chinensis. American Journal of Agricultural and Biological Sciences, 4(1), 24-31. https://doi.org/10.3844/ajabssp.2009.24.31

  • 4,353 Views
  • 4,575 Downloads
  • 3 Citations

Download

Keywords

  • Diatomaceous earth
  • gas exchange
  • particulate matter
  • PM10
  • photosynthesis
  • electrostatic