The Impact of Zinc Smelter Emissions on Forest Litter Arthropods
1978; Wiley; Volume: 31; Issue: 1 Linguagem: Inglês
10.2307/3543382
ISSN1600-0706
Autores Tópico(s)Soil Carbon and Nitrogen Dynamics
ResumoTullgren extractions were used to sample the litter arthropod fauna from mid-August through mid-October in three mixed-oak forest stands located about 1, 6 and 40 km from a zinc smelter in Pennsylvania. Mean arthropod density (n mn2) was estimated to be about 35000 at the 1-km site, about 72000 at 6 km, and about 161000 at the 40-km control site. Densities of all major taxonomic groups were lower near the smelter, with oribatid mites showing the greatest absolute decrease. Measurements of CO2 evolution were made on 02 litter samples and indicated that soil respiration rates were highest at the 40-km site and significantly less at both the 6-km and 1-km sites. Mean concentrations of about 26000 ppm Zn, 10000 ppm Fe, 2300 ppm Pb, 900 ppm Cd, 340 ppm Cu and 0.40% S were measured in the 02 litter layer at the 1-km site. Mean concentrations at 6 km were about 15000 ppm Zn, 6500 ppm Fe, 970 ppm Pb, 250 ppm Cd, 170 ppm Cu and 0.26% S. Mean concentrations from the control site (40 km) were 2800 ppm Fe, 650 ppm Zn, 260 ppm Pb, 50 ppm Cu, 9 ppm Cd and 0.13% S.
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