Abstract: The paper deals with the absorption, distribution and biological cycles of chemical el-ements in L. xylocarpus forest in north side of Ailao Mountain, Yunnan province. The results show that C is the most abundant element in the various plants of the forest community, especially in the trunk of trees. The content of inorganic elements from leaves, branches, roots and trunk graduately declined. The accumulation of chemical elements in the community .are estimated 260 346kg/ hm2, in which the accumulation ofchemical elements in tree layer account for 98.7 of the total. The accumulation of chemical elements in the community decreases in the order of OCa>N>Mg>Al>P>Na>Fe>Mn. C, Ca and N are stored mainly in trunk. Al and Fe are stored mainly in roots.

Key words: Lithocarpus xylocarpus forest