EFFECT OF DIFFERENT MANAGEMENT ON SOIL FERTILITY IN THE SLASH OF EVERGREEN BROADLEAVED FOREST IN SUBTROPIC

Different plantation management in the slash of evergreen broad -leaved forests results in the increase of soil volume weight 0. O6～ 0.31g / cm3 and the decrease of soil capillary porosity 3. 95%～10. 98%, soil uncapillary 4. 59%～7. 21% and soil total porosity 11.54%～16.32%. The content of humus, total nitrogen and total potassium of A horizon are higher than that of B horizon in the soil of six plantation types. The order of average content of humus and total nitrogen of soil is in schima- chinese fir mixed forest in Chinese Tuliptree-chinese fir mixed forestin everyreen broadleaved forest in Chinese forest ln Chinese Tuliptree in Masson pine. The correlation coefficient of soil humus and total nitrogeri, soil humus and total phenol, total nitrogen and total phenol is 0. 990, 0. 829 and 0. 883 respectively,showing close relationship. The ratio of humid acid and fulvie acid (HA/FA) of soil is less than 1 in Masson pine forest and more than 1 in the other five forest,Fertility of soil in schima- chinese fir mixed forest and Chinese Tuliptree-Chinese fir mixed forest is better than that in pure Chinese fir forest, and also have an obvious inhibition to polyphony oxides activity of soil.