his paper deals with the patterns of seasonal variation in the biomass of soil decompos-er microbes in the Leymus chinensis grasslands in northeast China. The data were collected byfield study and then used on a MV/6000 computer to construct contour equations which weresubject to F tests,giving better results with F_(0 .25)=2.68 and F_0=193.99. On this basis,theprediction and forecast on the biomass of soil decomposer microbes or even on the degree oforganic matter composed could be made by giving a cert...