EFFECTS OF ARTIFICIAL NITROGEN AND PHOSPHORUS DEPOSITIONS ON SOIL RESPIRATION IN TWO PLANTATIONS IN SOUTHERN CHINA

Abstract

N and P treatments promoted soil respiration rates under A. mangium but significantly decreased the soil respiration under E. urophylla. The lower level (5 ppm) P treatment significantly enhanced soil respiration rates in A. mangium and E. urophylla plantations. However, with the increase in P concentration, the soil respiration rates decreased under A. mangium but increased under E. urophylla. Soil respiration rates exhibited significant fluctuation and approached to nearly equal values at the end of the experiment.