Abstract
Effect of acidic stemflow input on soil biological properties around cedar tree trunk were examined in a 34 year old Japanese red cedar plantation forest. Average soil pH of soil around cedar trunk (stemflow soil) was 3.88 and that of soil between trees (throughfall soil) was 4.97, and this suggested soil acidification due to proton load via stemflow. Soil microarthropod density in soil was higher as close to tree trunk, whereas microbial biomass of surface soil was reduced ca. 30 % around trunk. Abundance of Collembola and Gamasid mites showed positive correlation to amount of soil organic matter, while Oribatida had strong negative correlation to soil pH.Tectocepheus velatus (Oribatida) was dominant in soils pH under 4.0. Annual decomposition rate of cedar foliage was reduced ca. 16% in stemflow soil compared to throughfall soil. More litter accumulation was observed in stemflow soil, but it was not significant, though low microbial activity and retarded litter decomposition may be responsible to the accumulation of organic matter in stemflow soil. Soil biological community and soil process have been changed due to stemflow, the affected area corresponded to ca. 9.4 % of the forest. Thus, ecological risk of acidification in the sense of decrease in decomposition rate is 1.4%.
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This study was partly supported by Grant-in-Aid for Scientific Research (A)(1), No.08506001 by The Ministry of Education, Science, Sports, and Culture, Japan, and by the research project “Establishment of a scientific framework for the management of toxicity of chemicals based on environmental risk-benefit analysis” supported by Core Research for Evolutional Science and Technology (CREST).
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Kaneko, N., Kofuji, Ri. Effects of soil pH gradient caused by stemflow acidification on soil microarthropod community structure in a Japanese red cedar plantation: An evaluation of ecological risk on decomposition. J For Res 5, 157–162 (2000). https://doi.org/10.1007/BF02762395
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DOI: https://doi.org/10.1007/BF02762395