Effects of artificial nitrogen and phosphorus depositions on soil respiration in two plantations in Southern China
2011
Lin, Y. B. | Cao, Y. S. | Rao, X. Q. | Fu, S. L.
In the present study, atmospheric nitrogen (N) and phosphorus (P) depositions were simulated with NH4NO3 and KH2PO4 solutions respectively to investigate the effects of N and P depositions on soil respiration in two plantations in southern China. The annual soil respiration rate under the control plot was 3190 ± 39.4 g CO2m-2and in the Acacia mangium and Eucalyptus urophylla plantations, the rate was 5180 ± 72.2 g CO2m-2. Results of the field experiment showed that both 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.
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