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

概要

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Effect of acidic stemflow input on soil biological properties around cedar tree trunk were examined in a 34 year old Japanese redcedar 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 soilwas higher as close to tree trunk. whereas microbial biomass of surface soil was reduced ca. 30% around trunk. Abundance ofCollembola and Gamasid mites showed positive correlation to amount of soil organic matter, while Oribatida had strong negativecorrelation to soil pH. Tectocepheus velarus (Oribatida) was dominant in soils pH under 4.0. Annual decomposition rate ofcedar 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, theaffected 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%.
一般社団法人日本森林学会の論文
2000-08-16