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Impact of Alkaline dust pollution on soil Microbial biomass carbon

The soil microbial biomass is an essential component of most terrestrial ecosystems because it is responsible for regulating nutrient cycling, and acts as a highly labile source of plant-available nutrients. | Turk J Agric For 31 (2007) 181-187 © TÜB‹TAK Impact of Alkaline Dust Pollution on Soil Microbial Biomass Carbon Ömer KARA, ‹lyas BOLAT Department of Forestry, Zonguldak Karaelmas University, 74100 Bart›n - TURKEY Received: 02.11.2006 Abstract: The effect of alkaline dust pollution emitted from Bart›n cement plant on the soil microbial biomass carbon was investigated using the chloroform fumigation-extraction (CFE) method. Microbial biomass C (Cmic) values ranged from 157.82 to -1 -1 1201.51 µg g soils in the polluted area and from 726.70 to 1529.14 µg g soils in the control area. Soils polluted with alkaline cement dust resulted in significant reductions in Cmic levels compared to control soils. Microbial biomass C correlated negatively with CaCO3 content (r = -0.52, P < 0.05) and positively with soil organic C (r = 0.67, P < 0.01). Cmic:Corg ratio proved to be a reliable soil microbial parameter for describing the change in the man-made ecosystem. Mean Cmic:Corg ratio was 2.55 and 3.09 in the polluted soils and control soils, respectively. The decrease in this ratio was an indication of soil degradation in the polluted soils. A significant decline in the Cmic:Corg ratio in cement dust-polluted soils also indicated that this parameter can serve as a good indicator of soil health. Key Words: Microbial biomass C, cement dust pollution, Cmic:Corg ratio, soil health Alkalen Partikül Kirlili¤inin Toprak Mikrobiyal Biomas Karbon ‹çeri¤ine Etkisi Özet: Bu çal›flmada, kloroform fumigasyon-ekstraksiyon yöntemi (CFE) kullan›larak Bart›n çimento fabrikas›ndan yay›lan alkalen partiküllerin toprak mikrobiyal biomas karbon içeri¤ine etkisi araflt›r›lm›flt›r. Mikrobiyal biomas C (Cmic) de¤erleri; kirli alanda 157.82-1201.51 µg g-1, kontrol alan›nda 726.70-1529.14 µg g-1 aras›nda de¤iflim göstermektedir. Kirli alandaki topraklar kontrole göre istatistiksel olarak daha düflük Cmic içeri¤ine sahiptir. Topraklar›n mikrobiyal biomas C içeri¤i; CaCO3 miktar› ile negatif (r = -0.52, P <