Abstract: The analysis on the Mn, Zn and Cu contents of litter, soil fauna and soil in Pinus ko-raiensis and broad-leaved mixed forest in Liangshui Natural Reserve of Xiaoxing’an Mountains showed that the test microelement contents in the litter, soil fauna and soil all followed the sequence of Mn>Zn>Cu, but varied with these environmental components, being in the sequence of soil>litter>soil fauna for Mn, soil fauna>litter and soil for Zn, and soil fauna>soil>litter for Cu. The change range of test microelement contents in litter was larger in broad-leaved forest than in coniferous forest. Different soil fauna differed in their microelement-enrichment capability, e . g ., earthworm, centipede, diplopod had the highest content of Mn, Zn and Cu, respectively. The contents of test microelements in soil fauna had significant correlations with their environmental background values, litter decomposition rate, food habit of soil fauna, and its absorbing selectivity and enrichment to microelements. The microelements contained in 5—20 cm soil layer were more than those in 0—5 cm soil layer, and their dynamics differed in various soil layers.

Key words: Sogatella furcifera, Rice varieties, Tolerance, Nutrient component in rice plants