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Decomposition of Leaf Litter Containing Heavy Metals in the Andong Serpentine Area, Korea  

Ryou, Sae-Han (Department of Life Science, College of Natural Science, Chung-Ang University)
Kim, Jeong-Myung (Department of Life Science, College of Natural Science, Chung-Ang University)
Cha, Sang-Seub (Department of Life Science, College of Natural Science, Chung-Ang University)
Shim, Jae-Kuk (Department of Life Science, College of Natural Science, Chung-Ang University)
Publication Information
Korean Journal of Environment and Ecology / v.24, no.4, 2010 , pp. 426-435 More about this Journal
Abstract
The present study attempts to compare the soil chemical characteristics and biological activities (i.e. microbial biomass and soil enzyme activities), and litter decomposition rate of Arundinella hirta and Miscanthus sinensis var. purpurascens) collected from serpentine and non-serpentine sites by litter bag techniques at serpentine and non-serpentine field experiment sites over a 9-month period. The serpentine soil showed higher pH and soil alkaliphosphatase activity, and lower soil dehydrogenase and urease activities than the non-serpentine soil. Microbial biomass-N at the serpentine soil was larger than the non-serpentine soil, although the microbial biomass-C and microbial biomass-N represented no significant difference between serpentine and non-serpentine soil. These results suggest that the larger microbial biomass-N caused the lower C/N in serpentine soil. At the end of the experiment, the litter samples of A. hirta and M. sinensis collected from serpentine soil revealed a 39.8% and 38.5% mass loss, and the litter sample from non-serpentine soil also showed a 41.1% and 41.7% mass loss at the serpentine site. On the other hand, at the non-serpentine site, 42.2%, 37.4%, and 46.8%, 44.8% were respectively shown. These results demonstrate that the litter decomposition rate is more intensely affected by the heavy metal content of leaf litter than soil contamination. Moreover, the litter collected from the serpentine soil had a lower C/N, whereas the litter decomposition rate was slower than the litter from the non-serpentine soil, because the heavy metal inhibition activities on the litter decomposition process were more conspicuous than the effect of litter qualities such as C/N ratio or lignin/N. The nutrient element content in the decomposing litter was gradually leached out, but heavy metals and Mg were accumulated in the decaying litter. This phenomenon was conspicuous at the serpentine site during the process of decomposition.
Keywords
LITTER DECOMPOSITION; MICROBIAL BIOMASS; SERPENTINE SOIL; SOIL ENZYMES;
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